Bob there are a few cases and a bulletin on the code. I would check the wiring to the TCM from the solenoid pack and then see if you see any moisture. If yes or damaged pins you will need to replace the harness..
Vehicle IssueMIL Lamp Illumination: DTC P0750, P0760, P0846, P0891 Set In The TCM;Use the DRBIII to determine which diagnostic codes are actively set in the TCM. Utilize the Diagnostic Trans Simulator tool (8333) to test the integrity of the solenoid control circuits. Diagnostic tests may indicate the solenoid pack is defective requiring replacement. Before replacing the solenoid pack, inspect the transmission harness at the solenoid pack for corrosion.
System or ComponentCustomer Concern (No DTCs)
Recommendation Unplugged the transmission main harness at the solenoid pack. Inspect the harness connector and on the solenoid 8-pin connector. Replaced damaged corroded terminals on the main transmission harness. Solenoid pack will require replacement if there's broken or corroded pin terminals. Water intrusion is usually the cause for harness terminals to fail prematurely. Ensure the transmission harness connector is securely fastened to the solenoid pack. A loose connector could allow water to enter.
07/20/04 2:45 PM
Vehicle IssueMil light is on, transmission related solenoid codes have set.;Vehicle is equipped with a 42RLE transmission. Example of codes that may set. P0750 - LR Solenoid Circuit P0755 - 2-4 or 2C Solenoid Circuit P0760 - OD Solenoid Circuit P0765 - UD Solenoid Circuit P0846 - 2-4 or 2C Pressure Switch Rationality P0871 - OD Pressure Switch Rationality P0841 - LR Pressure Switch Rationality
System or ComponentNo Shift / Will not Shift Up or Down;DTC / Error Message;Malfunction Indicator Light / MIL / Check Engine Light
Recommendation Inspect the transmission solenoid connector for corrosion. Refer to TSB 21-009-05 if moisture or corrosion is found.
08/11/06 4:02 PM