2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1740
scan tool. The transmission control module is part of the control solenoid valve assembly and is not serviced separately.
Conditions for Running the DTC
The clutch pressure control solenoid 4 commanded pressure is 1800 kPa (261 psi) for 3 seconds.
Conditions for Setting the DTC
The transmission control module detects the 1-3 clutch slip speed is greater than 200 RPM for 3 seconds.
Action Taken When the DTC Sets
* P079D is a Type B DTC.
* The transmission control module inhibits gear 1 and gear 3.
Conditions for Clearing the DTC
P079D is a Type B DTC.
Diagnostic Aids
When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure
conditions. Ensure the transmission fluid level is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those first.
Reference Information
DTC Type Reference
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, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729,
or P2730 are not set.
瀚慖f the DTC is 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.
3. 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.
4. 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.
5. 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.
6. Inspect the trans fluid pump ball check valve for possible sticking or damage.
瀚慖f you found a concern with this check ball, repair the concern.
7. Inspect the hybrid low, 1-2 clutch boost valve assembly for sticking or damage.
瀚慖f you found a concern with the hybrid low, 1-2 clutch boost valve assembly, repair or replace the valve or valve body.
8. Inspect the 1-3 clutch assembly for a slipping or damaged condition.
瀚慖f you found a 1-3 clutch assembly concern, repair or replace the 1-3 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.
