2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2594
DTC P0667, P0668, or P0669
* DTCs P0667, P0716, P0717, P0722, or P0723 are not set.
* The TCM internal temperature is between -55掳C and +150掳C (-67掳F and +302掳F).
* The engine speed is 500 RPM or more for 5 seconds.
* The ignition voltage is 8.6V or greater.
Conditions for Setting the DTC
P0667 - Condition 1
* Vehicle speed is 8 km/h (5 mph) or greater for 5 minutes.
* Torque converter clutch (TCC) slip speed is greater than 150 RPM for 3 minutes.
* The TCM internal temperature is between -55掳C and +21掳C (-67掳F and +70掳F).
* The TCM internal temperature has changed by less than 2.0掳C (3.6掳F) in 2 minutes.
* The transmission fluid temperature (TFT) is greater than 70掳C (158掳F).
* The TFT has increased by 55掳C (99掳F) since startup.
Condition 2
* Vehicle speed is 8 km/h (5 mph) or greater for 5 minutes.
* TCC slip speed is greater than 120 RPM for 5 minutes.
* The TCM internal temperature is between 120-150掳C (248-302掳F).
* The TCM internal temperature has changed by less than 2.0掳C (3.6掳F) in 2 minutes.
* The TFT is 70掳C (158掳F) or greater.
* The TFT has increased by 55掳C (99掳F) since startup.
Condition 3
The TCM internal temperature changes by 20掳C (36掳F) or greater 14 times over 7 seconds.
P0668
The TCM internal temperature is 249掳C (480掳F) or greater for 4 seconds or more.
P0669
The TCM internal temperature is -249掳C (-416掳F) or greater for 4 seconds or more.
Action Taken When the DTC Sets
* DTCs P0667, P0668, and P0669 are Type C DTCs.
* The TCM allows the vehicle to operate in transmission protection mode.
Conditions for Clearing the DTC
DTCs P0667, P0668, and P0669 are Type C DTCs.
Diagnostic Aids
During a road test, the TCM temperature should steadily increase to a normal operating temperature, and then stabilize.
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)
* Inline Harness Connector End Views (See: Power and Ground Distribution/Multiple Junction Connector/Diagrams)
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)
