2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2565
* The TCM shifts to a default gear and turns OFF.
Conditions for Clearing the DTC
DTC P0634 is a Type A DTC.
Diagnostic Aids
Inspect the transmission cooler, transmission fluid lines, engine cooling system, and transmission fluid level, and inspect for any obstructions in the
cooling system airflow which may cause an overheat condition. Inquire about customer towing or extreme driving conditions. An engine cooling
system or transmission cooling system malfunction may cause this diagnostic to set. Perform the control solenoid valve assembly inspection
procedure before replacing the control solenoid valve assembly.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
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 DTC P0563 is not set.
瀚慖f DTC is set, refer to DTC P0562 or P0563 (See: P Code Charts/P0562/2ML70 - Automatic Transmission).
2. Ignition ON, observe the scan tool Trans. Fluid Temp. parameter. The reading should be less than 141掳C (286掳F).
瀚慖f greater than the specified range, test for a transmission overheat condition.
3. Observe the scan tool TCM temperature parameter. The reading should be less than 141掳C (286掳F).
瀚慖f greater than the specified range, replace the control solenoid assembly.
Component Testing
* 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)
procedure.
* Line Pressure Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and
General Diagnostics/2ML70 - Automatic Transmission/Line Pressure Check) procedure.
* 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).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid valve assembly replacement, setup,
and programming.
6L45/6L50/6L80/6L90 - Automatic Transmission
