2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1735
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Output Speed Sensor Replacement (See: Powertrain Management/Transmission Control Systems/Sensors and Switches - Transmission and
Drivetrain/Sensors and Switches - A/T/Transmission Speed Sensor/Service and Repair/2ML70 - Automatic Transmission) for B14A
automatic transmission output shaft speed sensor
* Control Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid valve assembly replacement,
setup, and programming.
* 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).
P079A
DTC P079A
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 P079A
- Transmission Clutch 1 Slip Detected
Circuit/System Description
The transmission control module monitors the hybrid low, 1-2 clutch slip speed when the hybrid low, 1-2 clutch is applied. The hybrid low, 1-2
clutch is displayed as Clutch 1 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.
* The commanded gear is:
- Reverse
- EVT Mode 1
- Gear 1
- Gear 2
Conditions for Setting the DTC
The transmission control module detects Hybrid low, 1-2 clutch slip greater than 200 RPM for 3 seconds.
Action Taken When the DTC Sets
* P079A is a Type A DTC.
* The transmission control module inhibits Reverse, EVT Low, Gear 1 and Gear 2.
Conditions for Clearing the DTC
P079A is a Type A DTC.
Diagnostic Aids
When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure
conditions. An auxiliary transmission fluid pump producing low output pressure may cause a clutch slip condition. The Aux. Trans. Fluid Pump
Actual parameter should be within 25 percent of the Aux. Trans. Fluid Pump Commanded parameter. Ensure the transmission fluid level is correct
and there are no leaks. If there are any other transmission DTCs set, diagnose those first.
