2010 Cadillac Truck SRX FWD V6-3.0L Page 1294

2010 Cadillac Truck SRX FWD V6-3.0L Page 1294

6T70/6T75 - Automatic Transmission

DTC P0218

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 Descriptor

DTC P0218

- Transmission Fluid Overtemperature

Circuit/System Description

The primary source of heat in the transmission is the torque converter. Hot oil exits the torque converter through the torque converter clutch (TCC)

control valve and flows to the transmission cooler supply line. The supply line connects to the cooler, which is in the radiator. From the cooler, the

oil returns through the oil cooler return line and enters the lubrication circuits. After lubricating the internal components, the oil returns to the oil

pan. The transmission fluid temperature (TFT) sensor is located in the control solenoid valve assembly.

Conditions for Running the DTC

* The ignition voltage is 8.6 volts or greater.

* The TFT is -39 to +149掳C (-38 to +300掳F) for 5 seconds.

Conditions for Setting the DTC

The TFT is 140掳C (284掳F) or greater for 1 minute.

Action Taken When the DTC Sets

DTC P0218 is a Type C DTC.

Conditions for Clearing the DTC

DTC P0218 is a Type C DTC.

Diagnostic Aids

The driver information center (DIC), if equipped, will display 'TRANSMISSION HOT- Idle Engine' when the TFT reaches 132掳C (270掳F). The

TFT on the scan tool should rise steadily to a normal operating temperature, and then stabilize. Ask about the customer's driving habits, trailer

towing, etc. Trailer towing should occur in D4. Ensure the engine cooling system is functioning normally.

Reference Information

Schematic Reference

* Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)

* Park - Engine Running (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6T70/6T75 -

Automatic Transmission/Park - Engine Running)

* Fluid Passages (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6T70/6T75 - Automatic

Transmission/Fluid Passages)

Description and Operation

* Transmission General Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6T70/6T75 - Automatic Transmission/Transmission General Description)

* Transmission Indicators and Messages (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6T70/6T75 - Automatic Transmission/Transmission Indicators and Messages)

DTC Type Reference

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

(DTC) Type Definitions)