2010 Cadillac Truck Escalade RWD V8-6.2L Technical Service Bulletin # 08-07-30-021F Date: 110526
Electrical - Electrical Malfunction/Multiple DTCs
TECHNICAL
Bulletin No.: 08-07-30-021F
Date: May 26, 2011
Subject: Loss of High Speed GMLAN Communications, Intermittent No Crank, IP Gage Fluctuation, Intermittent Door Lock Cycling, Intermittent
Chime Operation, Various IP Warning Lamps Illuminated, Transmission May Not Shift, Communication DTCs U0073, U0100, U0101, U0102,
U0109, U0121 or U0140 Set (Repair Terminals in Transmission Harness Connector, Repair Open or Shorted GM High Speed LAN Circuits, Open
or Shorted Data Link Resistor, Corrosion or Poor Connections in Various Control Module Connectors)
Models:
2007-2010 Cadillac XLR
2007-2011 Cadillac Escalade Models
2009-2011 Cadillac Escalade Hybrid
2007-2011 Chevrolet Avalanche, Corvette, Silverado, Suburban, Tahoe
2008-2011 Chevrolet Silverado Hybrid, Tahoe Hybrid
2007-2011 GMC Sierra, Yukon Models
2008-2011 GMC Sierra Hybrid, Yukon Hybrid
2008-2009 HUMMER H2
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Equipped With Gasoline Engines and 6 Speed Automatic Transmission 6L80 (RPO MYC) or 6L90 (RPO MYD)
Equipped With Hybrid Propulsion (RPO HP2) and Two Mode 2ML70 Automatic Transmission
Please Refer to GWM/IVH
Supercede:
This bulletin is being revised to add the 2011 model year and update the Condition, Cause, Correction, Graphics, Parts and Warranty information.
Please discard Corporate Bulletin Number 08-07-30-021E (Section 07 - Transmission/Transaxle).
Condition
Some customers may comment on any of the following conditions:
- The malfunction indicator lamp (MIL) may be illuminated.
- Instrument panel cluster (IPC) warning lamps may illuminate.
- The transmission may not shift or defaults to 2nd gear.
- The door locks may cycle by themselves.
- The engine may not crank intermittently.
- A driver information center (DIC) message may be displayed.
- The IPC gages may fluctuate.
- Applying the brakes may cause the IPC to become erratic and the chimes to operate simultaneously.
Depending on the vehicle and build, technicians may find one or more, but not limited to the following, High Speed GMLAN Communication
DTCs set as Current or History:
- P0700: Transmission Control Module (TCM) Requested MIL Illumination.
- U0073: Control Module Communications Bus OFF.
- U0100: Lost Communication With ECM/PCM.
- U0101: Lost Communication With Transmission Control Module (TCM).
- U0102: Lost Communication with Transfer Case Control Module (TCCM).
- U0109: Lost Communication With Fuel Pump Control Module.
- U0121: Lost Communication With ABS Control Module.
- U0140: Lost Communication With Body Control Module (BCM).
- U186B: Lost Communication With TCM.
- U0129 : Lost Communication with Brake System Control Module.
- U186B: Lost Communication with TCM.
- U0293: Lost Communication with HP2 Powertrain Control Module.
- U1862: Battery Energy Control Module Lost Communication with Communications Gateway Module.
- U1886: Battery Energy Control Module Lost Communication with Engine Control Module (ECM).
- U1888: Hybrid Powertrain Control Module Lost Communication With Starter/Generator Control Module.
Cause
These conditions may be caused by, but not limited to, any of the following:
- Chafed, damaged, pinched, open or shorted wiring.
- The terminal(s) for the High Speed GMLAN Serial Data Bus has or have backed out of the 16-way electrical connector to the automatic
transmission.
- The terminal position assurance (TPA) lock in the transmission 16-way electrical connector is not fully seated.
- The High Speed GMLAN Serial Data Bus circuits are open or shorted to ground.
- Corrosion in a control module connector.
- Intermittent or poor connections in the inline connectors containing the High Speed GMLAN Serial Data Bus circuits.
- Water intrusion in a control module connector.
Note
Model Year 2007 vehicles.
- The Terminator Resistor is open or shorted.
Note
Model Year 2008 Sierra and Silverado vehicles.
- The Data Link Resistor is open or shorted.
Note
Model Year 2009 and newer Sierra and Silverado vehicles.
- The Data Link Resistor 1 is open or shorted.
Note
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Model Year 2008 and newer Avalanche, Escalade, Tahoe, Yukon vehicles.
- The Data Link Resistor 1 is open or shorted.
Note
Model Year 2008 and newer Hybrid RPO HP2 vehicles.
- The Data Link Resistor 2 (RPO HP2) is open or shorted.
Note
The following cause only pertains to hybrid RPO HP2 vehicles equipped with OnStar(R) Delete RPO UE0.
- The High Speed GMLAN jumper harness loop connector that plugs into the bottom rear of the interior driver side junction block, is open or
shorted from chafing on the IP brace.
Parts Information
Warranty Information
For transmission electrical repairs please note in the technicians comments field on the repair order which terminal number(s) were repaired or
replaced. Also if a male terminal is bent (transmission side of connector), then indicate the bent terminal number on the repair order.
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For vehicles repaired under warranty, use the table.
Disclaimer
Part 1
Correction
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Information for the Procedures to Diagnose and Repair the Above Conditions
1. Perform the Diagnostic System Check-Vehicle to begin your diagnosis.
2. Perform a thorough visual inspection of the vehicle.
3. Depending on the vehicle and vehicle build, some of the procedures may not be applicable.
4. The following procedure is the only one applicable to the Corvette and XLR.
Chafed Wiring Harness at Transmission Case Retaining Clip and Inspection of the 16-way Electrical Connector for Backed Out Terminals
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
3. Locate the 16-way electrical connector on the right side of the automatic transmission as shown.
4. Inspect for chafed, damaged, pinched, open or shorted wiring within the conduit of the harness where it is secured at the transmission by a
metal attachment clip as shown. Inspect any wiring harness where these metal attachment clips are used on the vehicle as needed.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures in SI. Protect the conduit by covering any sharp edge with butyl tape and the conduit and wiring
harness with woven polyester (PET) electrical tape. Secure the harness as needed.
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5. Before disconnecting the 16-way connector, inspect for any backed out terminals (2) as shown. Fully seated terminals (1) are shown for
comparison.
1. If a backed out terminal (2) is found, identify the terminal(s) on the repair order.
2. Look at the connector in order to identify the number of the cavity with the backed out terminal. Refer to Wiring Systems and Power
Management > Component Locator > Master Electrical Component List in SI.
Note
For 2ML70 Only: Disconnect the 4WAL electrical connector.
6. Use the following procedure to disconnect the 16-way electrical connector:
1. Release and hold the slide lock on the wiring harness connector.
2. Rotate the connector lever and remove the connector from the component.
7. Repair or replace the terminal(s) as necessary using the following procedure:
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1. Locate the terminal position assurance (TPA) as shown.
Note
The TPA cannot be removed from the connector while there are terminals present in the connector body.
2. Use a small flat blade tool to push the TPA until it bottoms out.
3. See the release tool cross reference in the Reference Guide of the J-38125 to ensure that the correct release tool is used. Use the
J-38125-28 tool to release the terminals by inserting the tool into the terminal cavity as shown.
4. While holding the removal tool in place, gently pull the wire out of the back of the connector.
Note
If the female terminal(s) must be replaced, it is part number 22124472200. It is located in Yazaki tray number 12 in the J-38125 Terminal
Repair Kit.
5. Repair or replace the terminal(s) as needed. Refer to the instructions in the J-38125 manual.
8. If the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management > Diagnostic
Information and Procedures in SI.
9. Slide the new terminal(s) into the correct cavity at the back of the connector until it locks in place. The new terminal(s) should be even with
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the other terminal(s).
10. Ensure that each terminal is locked in place by gently pulling on the wire.
Note
The male terminal(s) cannot be repaired as they are an integral part of the transmission control module (TCM).
11. Inspect for bent or misaligned terminal(s) in the transmission half of the electrical connector.
瀚慖f they are bent, use a suitable tool and apply gentle pressure to straighten them. Indicate on the repair order the terminal number that was
bent.
瀚慖f they are damaged, replace the TCM. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement in SI.
12. Prior to installing the transmission connector, perform the following steps to ensure that the TPA lock is fully seated.
Locate the TPA lock in the reassembled transmission connector. Refer to the arrow in the illustration above, which points to a TPA lock. This one
is in an unseated position. Using a small flat blade tool, push to seat the TPA until it bottoms out. Verify the TPA is fully seated.
- If the TPA is off-center in the check window as shown, then it is only partially seated. Note the large gap at the arrow. Reseat the TPA
lock and ensure that it is fully seated.
- If the TPA lock is centered in the window as shown, then it is fully seated. The gaps shown by the arrows should be even on both sides.
Note
For 2ML70 Only: Connect the 4WAL electrical connector.
13. Connect the 16-way electrical connector to the transmission.
14. Lower the vehicle.
15. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Part 2
Inspection of Fuse Block - I/P (Left Side) for Loose Connector X1
1. Turn OFF the ignition and all accessories.
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2. Disconnect the negative battery cable. Refer to Battery Disconnect Caution and Battery Negative Cable Disconnection and Connection in SI.
3. Remove the left side fuse block as shown.
4. Inspect connector X1 (1) on the back of the fuse block for a loose connection. Secure the connector as needed.
5. Install the left side fuse block.
6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
7. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Chafed IP Wiring Harness Near Park Brake Pedal Assembly
The above condition may cause one or more of the following fuses to open:
- 60A - MBEC1 (#72) (Underhood)
- 30A - AMP (#40) (Underhood)
- 15A - RDO (#41) (Underhood)
- 10A - IPC (#46) (Underhood)
- 15A - AIR BAG BATT (#51) (Underhood)
- 10A - DSM (Left side of IP)
Five areas of potential contact have been identified:
- The IP wiring branch to C202 may have been routed outboard of the junction block (left IP) and the retaining clip (1) off the branch may not
have been fully seated. Possible point of contact (2).
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- The IP wiring branch to C202 may have been pushed up and forward into the park brake assembly and the retaining clip off the branch may
not have been fully seated. Possible points of contact (1, 2).
- The IP wiring branch to C202 may not have been secured into place as the gray retaining clip (1) off the branch was never seated.
- The IP harness may be in hard contact with the top rear edge (1) of the park brake assembly.
- When releasing the park brake pedal, the moving part (1) at the end of the park brake release cable may be coming into hard contact with the
IP harness.
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If a condition is suspected or found with one of the circuits running to C1 or C2 of the junction block or to the inline IP-to-body connector (C202)
or at any of these areas of concern then remove the front driver side door sill plate, driver side body hinge pillar trim panel, left IP outer trim cover
and perform the following steps:
1. Turn OFF the ignition and all accessories.
2. Inspect the IP harness for chafed, damaged, pinched, open or shorted wiring at the park brake pedal assembly. Refer to the potential damage
points as shown in the photos - at the side and rear of the park brake assembly. Be advised that damage may be covered by electrical tape, or
turned away and hid from view.
3. Engage and release the park brake several times. Observe the moving part at the end of the park brake release cable as it may contact and
damage the IP harness. Inspect the IP harness at this possible contact point. Note that any damage may be covered by electrical tape and/or
hid from view.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures in SI. Protect the harness by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape.
Engage and release the park brake several times. Verify the harness is no longer making contact with any sharp edge or point of the park
brake assembly. If it is still making contact, route it away from the contact point and secure it with tie straps.
Proceed to Step 4.
4. Inspect how the IP branch to C202 is routed. Route the harness as necessary to match the correct routing in the photo as shown. In order to
route the IP harness branch correctly (behind the junction block-left I/P), remove the cover from the junction block-left I/P and unseat the
junction block from the bracket.
5. Disconnect C202. Route the harness so that it lies between the "goalposts" of the junction block bracket. Seat the junction block to the
bracket. The harness will now be under the junction block.
6. Secure the harness by seating the grey offset retaining clip to the dashmat (or brown "buddy clip" if present - usually on SUV's only).
Reconnect C202.
7. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Chafed IP Wiring Harness at Left Side Junction Block Mounting Bracket
1. Turn OFF the ignition and all accessories.
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
3. Remove the left side junction block. Refer to Instrument Panel Electrical Center or Junction Block Replacement - Left Side in SI.
4. Inspect for chafed, damaged, pinched, open or shorted wiring at the mounting bracket.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures in SI. Protect the harness by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the harness as needed.
5. Replace the left side junction block. Refer to Instrument Panel Electrical Center or Junction Block Replacement - Left Side in SI.
6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
7. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Part 3
Chafed Wiring Harness at Adjustable Pedals Motor
1. Turn OFF the ignition and all accessories.
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2. Inspect for chafed, damaged, pinched, open or shorted wiring at the adjustable pedals motor as shown.
3. If the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as needed.
4. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Chafed Wiring Harness at Transmission
1. Turn OFF the ignition and all accessories.
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
4. Support the transmission with a transmission jack.
5. Remove the transmission support crossmember. Refer to Transmission Support Crossmember Replacement in SI.
6. Lower the transmission sufficiently to provide access to the engine wiring harness where it routes from the engine intake manifold to the
transmission bell housing as shown.
7. Release the wiring harness conduit from the retainers that secure it to the transmission and/or transfer case.
8. Examine the harness for wiring that may be exposed outside of the conduit. Inspect all areas for chafed, damaged, pinched, open or shorted
wiring as shown. If damage to the wiring is not observed, then extract the wiring from the conduit and inspect all remaining areas as needed.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures > Wiring Repairs in SI. Protect the conduit by covering any sharp edge with butyl tape and the
harness with woven polyester (PET) electrical tape. Secure the harness as needed.
9. Raise the transmission as needed to install the transmission support crossmember. Refer to Transmission Support Crossmember Replacement
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in SI.
10. Lower the vehicle.
11. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
12. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Chafed Wiring Harness at Engine Intake Manifold
1. Turn OFF the ignition and all accessories.
2. Remove the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement in SI.
3. Release the wiring harness conduit from the retainers that secure it to the rear of the engine and at the top of the transmission bell housing.
Note
The engine intake manifold is shown removed to provide clarity.
4. Pull the wiring harness up gently at the rear of the engine (1).
Inspect for chafed (1), damaged, pinched, open or shorted wiring. If damage is not observed, then extract the wiring from the conduit and inspect
all of the remaining areas as needed.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the wiring harness within the conduit as needed. Attach the wiring harness conduit to the retainers
that secure it to the rear of the engine and at the top of the transmission bell housing.
5. Install the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement in SI.
6. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Chafed Wiring Harness at Chassis Body Mounts Left Side Frame Rail
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
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3. Inspect the wiring harness along the left side frame rail at the body mounts as shown for chafed, damaged, pinched, open or shorted wiring.
4. If the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management > Diagnostic
Information and Procedures. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven polyester (PET)
electrical tape. Secure the harness as needed.
5. Lower the vehicle.
6. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Part 4
GMLAN Terminator Resistor 2007 Vehicles
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
Typical Location of Terminator Resistor (1) Short Wheel Base Vehicle
Typical Location of Terminator Resistor (1) Long Wheel Base Vehicle - RPO NQZ
Typical Location of Terminator Resistor (1) Long Wheel Base Vehicle - Except RPO NQZ
Note
RPO NQZ Without Auxiliary Fuel Tank.
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3. On the vehicle being serviced, observe the location of the terminator resistor. Inspect the wiring harness leading to the terminator resistor, for
chafed, damaged, pinched, open or shorted wiring.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the harness as needed.
瀚慖f the wiring is not damaged, proceed to Step 4.
4. Disconnect the electrical connector from the terminator resistor.
5. Test the terminator resistor for 110-130ohm.
瀚慖f the resistance is not within the specified range, replace the terminator resistor and proceed to Step 6.
瀚慖f the resistance is within the specified range, connect the electrical connector to the terminator resistor. Refer to Power and Signal
Distribution > Data Communications > Scan Tool Does Not Communicate with High Speed GMLAN Device OR Diagnostic Trouble
Code (DTC) List - Vehicle in SI.
6. Connect the electrical connector to the terminator resistor. Secure the terminator resistor as needed.
7. Lower the vehicle.
8. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Data Link Resistor 1 2009 Vehicles
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
Typical Location of Data Link Resistor 1 (1) Short and Long Wheel Base Vehicles
Typical Location of Data Link Resistor 1 (1) Long Wheel Base HD Vehicles
3. On the vehicle being serviced, observe the location of the data link resistor 1 (1). Inspect the wiring harness leading to the data link resistor 1,
for chafed, damaged, pinched, open or shorted wiring.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the harness as needed.
瀚慖f damage is not found, proceed to Step 4.
4. Disconnect the electrical connector from the data link resistor 1.
5. Test the Data Link Resistor 1 for 110-130ohm.
瀚慖f the resistance is not within the specified range, replace the data link resistor 1 and proceed to Step 6.
瀚慖f the resistance is within the specified range, connect the electrical connector to the data link resistor 1. Refer to Power and Signal
Distribution > Data Communications > Scan Tool Does Not Communicate with High Speed GMLAN Device OR Diagnostic Trouble
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Code (DTC) List - Vehicle in SI.
6. Connect the electrical connector to the data link resistor 1. Secure the data link resistor 1 as needed.
7. Lower the vehicle.
8. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Rear Chassis Mounted Data Link Resistor 1 Chafed Wiring Harness Causing Intermittent No/Crank and/or Scan Tool Does Not
Communicate with High Speed GMLAN Device
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
3. Typical location of a data link resistor 1 (1) mounted on the rear of the chassis.
4. Inspect the wiring harness leading to the rear data link resistor 1, between the truck box and frame for chafed, damaged, pinched, open or
shorted wiring as shown.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the harness as needed. Proceed to Step 9.
瀚慖f the wiring is not damaged, proceed to Step 5.
5. Disconnect the electrical connector from the data link resistor 1.
6. Test the data link resistor 1 for 110-130ohm.
瀚慖f the resistance is not within the specified range, replace the data link resistor 1 and proceed to Step 7.
瀚慖f the resistance is within the specified range, connect the electrical connector to the data link resistor 1. Refer to Power and Signal
Distribution > Data Communications > Scan Tool Does Not Communicate with High Speed GMLAN Device OR Diagnostic Trouble
Code (DTC) List - Vehicle in SI.
7. Connect the electrical connector to the data link resistor 1. Secure the resistor as needed.
8. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven polyester (PET) electrical tape. Secure the
harness as needed.
9. Lower the vehicle.
10. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Inspection of Engine Harness Connector X109 for Backed Out or Bent Terminals and Poor Connections
1. Turn OFF the ignition and all accessories.
2. Locate the X109 connector. Refer to Wiring Systems and Power Management > Component Locator > Master Electrical Component List >
X109 in SI.
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3. Before disconnecting, verify the connector is fully seated together even though the lever is locked down as shown.
If the connector is not fully seated, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures > Connector Repairs in SI.
4. Inspect the connector for the following conditions:
- Backed out terminals
- Bent pins
- Corrosion
- Poor terminal tension (use the correct test probe)
瀚慖f a condition is found, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management > Diagnostic
Information and Procedures in SI.
AND
瀚慖f corrosion is found, proceed to the section of the bulletin titled: Repairing Fretting Corrosion to complete the repair.
5. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Inspection of Engine Harness Connector X115 for Backed Out or Bent Terminals and Poor Connections
1. Turn OFF the ignition and all accessories.
2. Locate the X115 connector. Refer to Wiring Systems and Power Management > Component Locator > Master Electrical Component List >
X115 in SI.
3. Inspect the connector for the following conditions:
- Backed out terminals
- Bent pins
- Corrosion
- Poor terminal fit (use the correct test probe)
瀚慖f a condition is found, repair as needed. Refer to Wiring Systems and Power Management > Diagnostic Information and Procedures in
SI.
AND
瀚慖f corrosion is found, proceed to the section of the bulletin titled: Repairing Fretting Corrosion to complete the repair.
4. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Hybrid Models (HP2) Chafed Wiring Harness Locations and Inspection of Engine Harness Connector X150 for Backed Out Terminals
and/or Poor Connections at Ground Locations G102 and G300
1. Turn OFF the ignition and all accessories.
2. Locate the X150 connector. Refer to Wiring Systems and Power Management > Component Locator > Master Electrical Component List >
X150 in SI.
3. Inspect the connector for the following conditions:
- Backed out terminals
- Bent pins
- Corrosion
- Poor terminal fit (use the correct test probe)
瀚慖f a condition is found, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management > Diagnostic
Information and Procedures in SI.
AND
瀚慖f corrosion is found, proceed to the section of this bulletin titled: Repairing Fretting Corrosion to complete the repair.
瀚慖f a condition or corrosion is not found, proceed to Step 4.
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4. Inspect for a misrouted harness having chafed, damaged, pinched, open or shorted wiring from rubbing on the cooling fins of the
Transmission Auxiliary Fluid Pump Control Module as shown.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures in SI. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the harness as needed. Proceed to Step 8.
瀚慖f the wiring is not damaged, proceed to Step 5.
5. Inspect for chafed, damaged, pinched or shorted wiring caused by a mispositioned harness retaining clip as shown. This condition usually
occurs when the tab of the clip is aligned with a slot in the conduit.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures in SI. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the harness as needed. Proceed to Step 8.
瀚慖f the wiring is not damaged, proceed to Step 6.
6. Locate ground connections G102 and G300. Refer to Wiring Systems and Power Management > Component Locator > Master Electrical
Component List > G102 and G300 in SI.
7. Inspect G102 and G300 for a clean and tight connection. Undercoating or corrosion may be present between the eyelet and the frame
resulting in a poor connection.
瀚慖f a poor connection or undercoating is found, clean the area and repair as needed. Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic Information and Procedures in SI.
Proceed to Step 8.
瀚慖f corrosion is found, clean the area and repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power
Management > Diagnostic Information and Procedures in SI. Proceed to the section of this bulletin titled: Repairing Fretting Corrosion
to complete the repair.
8. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Hybrid Models (RPO HP2) Data Link Resistor 2
1. Turn OFF the ignition and all accessories.
2. Inspect the harness leading to the data link resistor 2 (1) for chafed, damaged, pinched, open or shorted wiring. Refer to Power and Signal
Distribution > Data Communications > Schematic and Routing Diagrams > Data Communication Schematics.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures. Protect the conduit by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the harness as needed.
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瀚慖f the wiring is not damaged, proceed to Step 3.
3. Disconnect the electrical connector from the data link resistor 2.
4. Test the data link resistor 2 for 110-130ohm.
瀚慖f the resistance is not within the specified range, replace the data link resistor 2 and proceed to Step 5.
瀚慖f the resistance is within the specified range, connect the electrical connector to the terminator resistor. Refer to Power and Signal
Distribution > Data Communications > Scan Tool Does Not Communicate with High Speed GMLAN Device OR Diagnostic Trouble
Code (DTC) List - Vehicle in SI.
5. Connect the electrical connector to the data link resistor 2. Secure the resistor as needed.
6. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Hybrid Models (HP2) Equipped With OnStar(R) Delete RPO UE0 - IP Junction Block Jumper Harness Loop Connector Chafed Wiring
Various Symptoms and/or Powertrain and Communication DTCs Set
The following is a list of some of the DTCs that may be set and is not all inclusive: C0242, P0700, P0AC4, U0293, U0100, U0109, U0129, U0140,
U1862, U186B, U1886 or U1888.
1. Turn OFF the ignition and all accessories.
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
3. Locate the junction block (1) on the driver side of the vehicle under the instrument panel (IP).
4. Locate the jumper harness loop connector that plugs into the bottom back of the junction block.
5. Inspect the jumper harness loop connector (1) for chafed (2), damaged, pinched, open or shorted wiring from contact with the IP brace.
瀚慖f the wiring is damaged, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures in SI. Protect the harness by covering any sharp edge with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the jumper harness loop connector as needed. Proceed to Step 6.
瀚慖f the wiring is not repairable, replace the P/N 15127940 jumper harness loop connector. Protect the connector by covering any sharp
edge with butyl tape and the jumper harness loop connector wiring with woven polyester (PET) electrical tape. Secure the harness as
needed. Proceed to Step 6.
2010 Cadillac Truck Escalade RWD V8-6.2L Page 167
6. Secure the junction block as needed.
7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
8. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Lost Communication with Various Control Modules and DTCs Set
DTC Descriptors
Note
Depending on the vehicle and vehicle build there may be other DTCs set by other modules.
- DTC U0073 Control Module Communication Bus A Off
- DTC U0100 Lost Communication with Engine/Powertrain Control Module (ECM/PCM)
- DTC U0101 Lost Communication with Transmission Control Module (TCM)
- DTC U0102 Lost Communication with Transfer Case Control Module
- DTC U0121 Lost Communication with Electronic Brake Control Module (EBCM)
- DTC U0140 Lost Communication with Body Control Module (BCM)
1. Connect a scan tool and perform the Diagnostic System Check - Vehicle. Retrieve and record any DTCs, Current or in History from all of the
control modules.
If any DTC(s) are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to identify the connector(s) of the control module/component
which may be causing the condition.
2. Turn OFF the ignition and all accessories.
3. Disconnect the connector(s) at the affected module.
4. Inspect the connector(s) for the following conditions:
- Backed out terminals
- Bent pins
- Corrosion
- Poor terminal tension. Use the correct test probe.
- Water intrusion
瀚慖f a condition is found, repair as needed. Refer to Power and Signal Distribution > Wiring Systems and Power Management >
Diagnostic Information and Procedures in SI.
Proceed to Step 5.
瀚慖f corrosion or water intrusion is found, proceed to the section of this bulletin titled: Repairing Fretting Corrosion to complete the
repair.
5. Reconnect the connector at the affected module.
6. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Inspection of Electronic Suspension Control (ESC) Module Connector for Missing Weather Plugs in Not Used Cavities (RPO Z55 or G69)
1. Turn OFF the ignition and all accessories.
Typical Location of ESC Module
2. Locate the ESC module (1).
3. Disconnect the connector (2) at the ESC module (1).
Typical View of Missing Weather Plug
2010 Cadillac Truck Escalade RWD V8-6.2L Page 168
4. Inspect the connector of the ESC module for weather plugs that are missing from: Not Used cavities (1). Refer to > Power and Signal
Distribution > Wiring Systems and Power Management > Component Locator > Master Electrical Component List > Electronic Suspension
Control (ESC) Module > Connector End View for a list of cavities that are: Not Used .
瀚慖f a weather plug is missing from any Not Used cavity, repair as needed.
5. Install the connector (2) to the ESC module (1).
6. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
Repairing Fretting Corrosion
Note
Fretting corrosion looks like little dark smudges on the electrical terminals and appear where the actual electrical contact is being made. In
less severe cases it may be unable to be seen or identified without the use of a magnifying glass.
1. If water intrusion is observed in the connector, use pressure regulated compressed air to dry it out.
2. DO NOT apply an excessive amount of dielectric lubricant as shown, to the connectors as hydrolock may result when attempting to mate the
connectors.
Important
Use ONLY a clean nylon brush that is DEDICATED to the repair of this specific condition.
Using a one-inch or smaller nylon bristle brush, apply dielectric lubricant P/N 12377900 (in Canada P/N 10953529) to both the module or
component side and the harness side of the affected connectors.
3. Reconnect the affected connector(s) and wipe away any excess lubricant that may be present.
4. If needed, connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI.
5. Clear any DTCs that may be present with a scan tool and verify the proper operation of the vehicle.
OnStar is a registered trademark of the OnStar Corporation.
