2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1837
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Circuit/System Verification
1. Verify that DTCs P0721, P0722, P0723, P0756, P0757, P0796, P0797, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977,
P2720, P2721, P2728, P2729, P2730, P2797, or P0C2B is not set.
瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. Perform the Transmission Fluid Level and Condition Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing
and Inspection/Symptom Related Diagnostic Procedures/2ML70 - Automatic Transmission/Transmission Fluid Level and Condition Check)
to verify correct fluid level and condition.
3. Verify using Freeze Frame and Failure Records, the Aux. Trans. Fluid Pump Actual parameter is within 25 percent of the Aux. Trans. Fluid
Pump Commanded parameter.
瀚慖f the Aux. Trans. Fluid Pump Actual parameter is not within 25 percent of the Aux. Trans. Fluid Pump Commanded parameter, refer to
Auxiliary Fluid Pump Pressure High or Low (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and
Inspection/Symptom Related Diagnostic Procedures/2ML70 - Automatic Transmission/Auxiliary Fluid Pump Pressure High or Low).
4. Perform the Line Pressure Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component
Tests and General Diagnostics/2ML70 - Automatic Transmission/Line Pressure Check) to verify correct oil pressure.
5. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/2ML70 - Automatic Transmission/Control
Solenoid Valve and Transmission Control Module Assembly Inspection) to verify control solenoid valve assembly condition.
6. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test (See: Transmission and
Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/2ML70 - Automatic
Transmission/Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test) to verify control solenoid
valve assembly function.
7. Inspect the trans fluid pump ball check valve for possible sticking or damage.
瀚慖f you found a concern with the check ball, repair the concern.
8. Inspect the hybrid low, 1-2 clutch regulator valve for sticking or damage.
瀚慖f you found a concern with the hybrid low, 1-2 clutch regulator valve, repair or replace the valve or valve body.
9. Inspect the hybrid low, 1-2 clutch assembly for wear or damage.
瀚慖f you found a hybrid low, 1-2 clutch assembly concern, repair or replace the low and reverse clutch assembly as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control Valve Assembly Disassemble (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Service and
Repair/Overhaul/2ML70 - Automatic Transmission/54. Control Valve Assembly Disassemble) for valve body inspection procedures.
* Control Valve Upper Body Replacement (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Valve Body/Service and
Repair/2ML70 - Automatic Transmission) for control valve body replacement.
* Hybrid Low, 1-2 Clutch Piston Removal (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Service and
Repair/Overhaul/2ML70 - Automatic Transmission/24. Hybrid Low, 1-2 Clutch Piston Removal) for hybrid low, 1-2 clutch assembly
inspection.
* Hybrid Low, 1-2 Clutch Piston Installation (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Service and
Repair/Overhaul/2ML70 - Automatic Transmission/31. Hybrid Low, 1-2 Clutch Piston Installation) for low and hybrid low, 1-2 clutch
assembly replacement.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid valve assembly replacement,
setup, and programming.
P079B
DTC P079B
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.
