Uplander FWD V6-3.5L VIN L (2006)
Wiring Harness: Customer Interest
A/T Controls - MIL ON/Harsh Shifts/DTC's P0742/P2761
Bulletin No.: 06-07-30-034
Date: December 20, 2006
TECHNICAL
Subject:
Service Engine Soon (SES) or Check Engine Light On, Harsh Shift, DTCs P0742 and P2761 Set or Just P2764 Set (Replace Automatic Transmission
Wiring Harness)
Models:
2006-2007 Buick Allure (Canada), LaCrosse, Lucerne, Rendezvous, Terraza
2006-2007 Chevrolet Impala, Malibu SS, Malibu Maxx SS, Monte Carlo, Uplander
2006-2007 Pontiac Grand Prix, G6 GTP, Montana SV6
2006-2007 Saturn Relay
with 4T65-E Automatic Transmission (RPOs MN7, M15 or M76)
Condition
Some customers may comment on the Service Engine Soon (SES) or Check Engine light being illuminated. Upon investigation, the technician may find
DTCs P0742 and P2764 together or just P2761 set as current or in history. Also, the customer may comment on a harsh shift.
Cause
The tan wire (1) of the Torque Converter Clutch (TCC) Solenoid Valve harness may be incorrectly routed around a metal retaining clip causing a chafe
in the wire insulation, resulting in a short to ground. The harsh shift concern is due to the default code causing high line pressure to be commanded.
Correction
If diagnosis indicates a grounded circuit, replace the transmission wiring harness following the published replacement procedure in SI. Be sure to route
the tan wire out of the metal clip.
When servicing 2007 vehicles, the metal clip for the temperature sensor connector on the new harness must be removed and discarded prior to
installation. Reuse the plastic clip from the old harness.
