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· Registered
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There is a TSB for that

Bulletin No.: 06-07-30-034

Date: December 20, 2006

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)

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)


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.
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.


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.

· Registered
287 Posts
So I brought my car to the dealer and you were right it was the Transmission Wiring Harness they had to replace, cost about 190 bucks to replace but at least its fixed now.
Well, I am glad you got it fixed. I don't understand why they charged you for the repair, it's a TSB so I think that would indicate a manufacturer defect.

Seems like there are many defects with these cars. Luckily I have not had much trouble with mine. It seems like its always stupid things that are giving people the most trouble.

I think I am going to buy a classic car next. Been looking at a 70 LaMans with a 389 and 400 turbo. Not all original but it has upgraded suspension, steering and has been lowered 1" and has 15" thrust wheels. Does not have all the bells and whistles but I know I can put 100k miles on it with no problems.

It looks good and is silly fast.
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