GPEC

P0218-HIGH TEMPERATURE OPERATION ACTIVATED

For a complete wiring diagram Consult Diagrams/Electrical.

Theory of Operation

This DTC will set to indicate an overheating transmission or engine cooling system. Extended transmission operation above 115° C (240° F) will reduce the durability of the transmission and should be avoided. Correcting the cooling system operation or installing an additional transmission oil cooler will improve transmission durability, especially under extreme conditions such as city/construction stop and go traffic, trailer towing, aggressive driving in low gear, or operation in mountainous areas.

- When Monitored:
With the engine running.

- Set Condition:
The transmission overheat shift schedule is activated when the transmission oil temperature reaches 115° C (240° F).





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC ACTIVE IN TRANSMISSION CONTROL MODULE
This is an informational DTC that indicates that the transmission has been operating in the "Overheat" shift schedule.
With the scan tool, select View DTCs in the Transmission Control Module.
Are any DTCs set in the Transmission Control Module?

Yes

- Diagnose and repair the DTC(s).
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Go to 2

2. TRANSMISSION OVERHEATING
With the scan tool, review the Freeze Frame information to help identify the conditions in which the DTC was set.
Attempt to drive the vehicle under the conditions in which the DTC was set.
Transmission overheating may indicate the need for an additional transmission oil cooler.
Check the transmission oil cooler flow.
Check for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary. If the transmission oil cooler is plugged, repair the cause of the plugged oil cooler
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Go to 3

3. ENGINE OVERHEATING
Check the engine cooling system operation.
Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking For An Intermittent DTC