2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1661
Action Taken When the DTC Sets
* DTCs P0815, P0816, and P0826 are Type C DTCs.
* The TCM disables TAP shift operation.
Conditions for Clearing the DTC
DTCs P0815, P0816, and P0826 are Type C DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)
Connector End View Reference
* Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
* Inline Harness Connector End Views (See: Diagrams/Connector Views/Multiple Junction Connector/Connector End Views By Number)
Description and Operation
Transmission General Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6T70/6T75 -
Automatic Transmission/Transmission General Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. If other DTCs are set, diagnose them first.
2. Ignition ON, transmission shift lever in Park, observe the scan tool Driver Shift Control parameter. The reading should display Inactive.
3. With the transmission shift lever in manual mode (M), observe the scan tool Driver Shift Control parameter. The reading should display
active.
4. Observe the scan tool Driver Shift Request parameter. The reading should display None.
5. Press the left Tap Up (+) switch, left Tap Down (-) switch, right Tap Up (+) switch and right Tap Down (-) switch while observing the scan
tool Up and Down Shift Switch parameter. The parameter should read Upshift when the Tap Up switch is pressed, and Downshift when the
Tap Down switch is pressed, and None when neither switch is pressed.
6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the transmission shift lever.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit harness connector terminal 3 and ground.
瀚慖f the test lamp does not illuminate, test the IGN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
3. Verify the scan tool Driver Shift Request parameter indicates Invalid.
瀚慖f other than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
4. Ignition OFF, test for 8.0-8.5 k ohms between the left automatic transmission manual shift switch terminals 3 and 5. Verify the resistance
changes to 2.7-3.1 k ohms when the Tap Up switch is pressed and 1.1-1.5 k ohms when the Tap Down switch is pressed.
