2010 Cadillac Truck SRX FWD V6-3.0L Page 2151
2. Test for 5-5.6 ohm at 20掳C (68掳F) between the low reference circuit terminal 4 X2 and the voltage supply circuit terminal 9 X2.
瀚慖f less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27D Pressure Control
Solenoid Valve 4.
3. Test for infinite resistance between each terminal and the low reference circuit terminal 4 X2 and also to the voltage supply circuit terminal 9
X2.
瀚慖f less than the specified range, replace the wiring harness.
4. If all circuit test normal, perform the control solenoid valve inspection. Refer to Control Solenoid Valve Inspection (M36 and MXE) (See:
Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/AF40-6 -
Automatic Transmission).
瀚慖f the inspection test normal, replace the control valve body.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control valve body replacement-Refer to Control Valve Body Replacement (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Valve Body/Service and Repair/AF40-6 - Automatic Transmission/Control Valve Body Replacement) for
replacement, setup, and programming.
* TCM-Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for replacement, setup, and
programming.
* Perform the Transmission Adaptive Functions (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and
Operation/AF40-6 - Automatic Transmission/Transmission Adaptive Functions).
* Wiring harness-Refer to Automatic Transmission Wiring Harness Replacement (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Wiring Harness/Service and Repair) for replacement.
All Other P Codes
If the P code is not listed, then:
- Either the code may not be valid for this vehicle or year.
- Or the information published by the OEM does not include this code for this vehicle or year.
- Or ALLDATA has not added the information for this code yet.
U0001
DTC U0001
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC U0001 00
- High Speed CAN Communication Bus
Circuit Description
Modules connected to the GMLAN serial data circuits monitor for serial data communications on the GMLAN network during normal vehicle
operation. Operating information and commands are exchanged among the modules. Each module on GMLAN network maintains a transmit error
counter (TEC) and a receive error counter (REC). The counter values increase with detected errors and will decrease with error-free messages. If
the TEC value exceeds 255 the controller removes itself from the network and a DTC U0001 will be set.
Conditions for Running the DTC
* Voltage supplied to the module is in the normal operating voltage range.
* The vehicle power mode requires serial data communication to occur.
Conditions for Setting the DTC
