P0218

DTC P0218

Circuit Description
The torque converter is the primary source of heat in the transmission. In order to prevent overheating of the torque converter and the automatic transmission fluid, the powertrain control module (PCM) monitors the transmission fluid temperature (TFT), torque converter slip, ambient temperature, and various other conditions. The PCM uses the information it monitors to estimate the torque converter temperature. If the PCM detects a high TFT, or estimates the temperature of the torque converter to exceed a predetermined temperature, DTC P0218 sets. DTC P0218 is a type C DTC.

Conditions for Running the DTC
- No ECT DTCs P0116, P0117, or P0118.
- No TFT DTCs P0711, P0712, or P0713.
- The system voltage is 11 volts or greater.

Conditions for Setting the DTC
- The TIFT is 1500C (3020F) or greater.
- The estimated temperature of the torque converter is greater than a predetermined temperature.
- The torque converter slip ratio is greater than a predetermined slip.

Action Taken When the DTC Sets
- The PCM does not illuminate the malfunction indicator lamp (MIL).
- The PCM flashes the CHECK COOLANT TEMP indicator.
- The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
- The PCM stores DTC P0218 in PCM history.

Conditions for Clearing the CHECK COOLANT TEMP Indicator/DTC
- The PCM turns the CHECK COOLANT TEMP indicator OFF when the condition no longer exists.
- A scan tool can clear the CHECK COOLANT TEMP/DTC.

Diagnostic Aids
- Inspect for vehicle overloading.
- Inspect for excessive trailer towing.
- Inspect for extensive stalling condition, by racing the engine while in gear and the vehicle stopped.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests for low fluid level, which can cause high transmission fluid temperatures.
3. This step inspects for transmission cooling restrictions.

Steps 1 - 8:

DTC P0218