2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1839
8. Inspect the hybrid direct, 2-3-4 clutch for a slipping or damaged condition.
瀚慖f you found a hybrid direct, 2-3-4 clutch concern, repair or replace the hybrid direct, 2-3-4 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 Direct, 2-3-4 Clutch Housing Overhaul (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Service and
Repair/Overhaul/2ML70 - Automatic Transmission/29. Hybrid Direct, 2-3-4 Clutch Housing Overhaul) for hybrid direct, 2-3-4 clutch
replacement.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid valve assembly replacement,
setup, and programming.
P079C
DTC P079C
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 P079C
- Transmission Clutch 3 Slip Detected
Circuit/System Description
The transmission control module monitors the 4th clutch slip Speed when the 4th clutch is applied. The 4th clutch is displayed as Clutch 3 on the
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 PC solenoid 3 commanded pressure is 1800 kPa (261 psi) for 3 seconds.
Conditions for Setting the DTC
The transmission control module detects the 4th clutch slip speed is greater than 100 RPM for greater than 3 seconds.
Action Taken When the DTC Sets
* P079C is a Type B DTC.
* The transmission control module inhibits gear 4.
Conditions for Clearing the DTC
P079C 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)
