For a complete wiring diagram Refer to Section 8W.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 CausesENGINE COOLING SYSTEM OPERATIONTRANSMISSION OIL COOLER PLUGGEDHIGH TEMPERATURE OPERATIONS ACTIVATEDAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) 1. CHECK ENGINE COOLING SYSTEMPerform Engine Cooling System diagnostics per the Service Information.Is the Engine Cooling System functioning properly?YesGo To 2NoRepair 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 RESTRICTEDCheck the Transmission Oil Cooler Flow in accordance with the Service Information.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) NoGo To 33. HIGH TEMPERATURE OPERATIONThis DTC is an informational DTC designed to aid the Technician in diagnosing shift quality complaints.This DTC indicates that the transmission has been operating in the "Overheat" shift schedule which may generate a customer complaint.The customer driving patterns may indicate the need for an additional transmission oil cooler.With the scan tool, check the DTC EVENT DATA to help identify the conditions in which the DTC was set.Check for any Service Information Tune-ups or Service Bulletins for any possible causes that may apply.If there are no possible causes remaining, view repair.RepairRepair the cause of transmission overheating per the Service Information.Perform 42RLE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)