2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2763
The control solenoid valve assembly detects an internal low voltage electrical malfunction of the shift solenoid 1 control circuit when shift solenoid
1 is commanded OFF for 1 second.
P0974
The control solenoid valve assembly detects an internal high voltage electrical malfunction of the shift solenoid 1 control circuit when shift
solenoid 1 is commanded ON for 1 second.
Action Taken When the DTC Sets
* DTCs P0973 and P0974 are Type A DTCs.
* The transmission control module defaults the transmission to EVT 1 or EVT 2 depending on vehicle speed.
* The transmission control module commands maximum line pressure.
* The transmission control module freezes transmission adaptive functions.
Conditions for Clearing the DTC
DTCs P0973 and P0974 are Type A DTCs.
Diagnostic Aids
When attempting to set solenoid electrical DTCs, ensure the control solenoid valve assembly is warmed up and the transmission is operated long
enough to ensure a 3掳C (5掳F) increase in TCM temperature parameter. This will place the transmission control module under the optimal conditions
to test solenoid electrical DTCs.
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)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information.
Circuit/System Verification
1. Engine ON, verify the transmission fluid temperature is between 50-80掳C (122-176掳F).
2. Operate the vehicle with the transmission in M1 range long enough to verify at least a 3掳C (5掳F) rise in TCM temperature parameter, then
operate the vehicle in Park for 5 seconds.
3. Engine ON, observe the scan tool Shift Sol. 1 CKT Status parameter. The reading should display OK or Indeterminate.
瀚慖f the reading is not within the specified range, replace the control solenoid valve assembly.
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.
6L50/6L80/6L90 - Automatic Transmission
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