2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2229

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2229

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Circuit/System Verification

DTCs P0668 and P0669

Verify that DTC P0667, P0668 or P0669 is not set.

If the DTC is set, program the Q8 control solenoid valve assembly. If the DTC resets, replace the Q8 control solenoid valve assembly.

Component Testing

Perform the 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 Q8 control solenoid valve assembly replacement,

setup, and programming.

6L50/6L80/6L90 - Automatic Transmission

DTC P0667, P0668, or P0669

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 Descriptors

DTC P0667

- Transmission Control Module (TCM) Temperature Sensor Performance

DTC P0668

- Transmission Control Module (TCM) Temperature Sensor Circuit Low Voltage

DTC P0669

- Transmission Control Module (TCM) Temperature Sensor Circuit High Voltage

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).