P1797-MANUAL SHIFT OVERHEAT

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The major cause of heat build up in the transmission is torque converter slip. With the transmission in the AutoStick mode, the torque converter can slip during aggressive driving or heavy loading conditions such as trailer towing or driving up steep grades. In the non AutoStick mode, internal controller logic prevents the transmission from overheating by managing the shift and EMCC schedule. In the AutoStick mode, when the transmission or engine temperature approaches an overheat condition, the manual shift overheat DTC sets and the AutoStick mode is temporarily suspended until the temperature returns to normal.



Possible Causes
MANUAL SHIFT OVERHEAT

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



Diagnostic Test

1. MANUAL SHIFT OVERHEAT

This is an informational DTC only.
With the scan tool, check the DTC EVENT DATA to help identify the conditions in which the DTC was set.
Check the engine and transmission cooling system for proper operation.
Check the Radiator Cooling Fan operation.
Check the Transmission Cooling operation.
Check the Transmission Fluid Level per the Service Information to verify that it is not overfilled.

NOTE: Aggressive driving or driving in Low for extended periods of time will set this DTC.



If there are no possible causes remaining, view repair.

Repair