2010 Cadillac CTS Sedan AWD V6-3.6L Page 1576
Circuit/System Description
The transmission control module (TCM) temperature sensor is located inside of the control solenoid valve assembly which has no serviceable parts.
The TCM temperature sensor provides the temperature of the TCM. This temperature reading is used in various diagnostic routines in the TCM
software. This fault is handled inside the TCM and no external circuits are involved.
Conditions for Running the DTC
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 start-up.
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 start-up.
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/Circuit Testing/Circuit Testing)
