P0218-HIGH TEMPERATURE OPERATION ACTIVATED

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

The DTC is an informational code only and is being set to aid the technician in determining root cause of a customer driveability issue. The code is also intended to alert the technician to determine if a cooling system malfunction has occurred or if an additional transmission air to oil cooler should be added to the vehicle if the customer regularly drives in a manner that overheats the transmission.

When Monitored:
Whenever the engine is running.
Set Condition:
Immediately when an Overheat shift schedule is activated when the Transmission Oil Temperature reaches 115° C (240° F).

Possible Causes

ENGINE COOLING SYSTEM OPERATION

TRANSMISSION OIL COOLER PLUGGED

HIGH TEMPERATURE OPERATIONS ACTIVATED

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)

Diagnostic Test

1.CHECK ENGINE COOLING SYSTEM

Is the Engine Cooling System functioning properly?

Yes

Go To 2

Repair the cause of the engine overheating. Refer to the Service Information for the related diagnostic or repair procedures.
Perform 42RLE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)

2.TRANSMISSION OIL COOLER RESTRICTED

Is the transmission oil cooler restricted or plugged?

Yes

Repair the cause of the plugged Transmission Oil Cooler as necessary and repair or replace the Transmission Oil Cooler per the Service Information.
Perform 42RLE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)

Go To 3

3.HIGH TEMPERATURE OPERATION

If there are no possible causes remaining, view repair.

Repair

Repair the cause of transmission overheating per the Service Information.
Perform 42RLE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)