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Discussion Starter · #1 ·
I have a 2010 nox , 4cyl., with 1400 miles on it. About 5 times now, after taking off from a stop, i experianced what seems to be a hard transmission shift from i believe 3rd to 4th gear. Kinda makes the car buck when it shifts. You can also hear a clunk at the same time. Anyone experiance this problem. I already talked to my dealer, so i have it in their records.......
 

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The 6 speed tranny is computer controlled...the dealer service department should be able to reflash different software (I believe there are at least 2-3 versions) until you find one that shifts the way you think it should.
 

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2 TSB's:

TSB Number: SB-09271C NHTSA Number: 10033029 TSB Date: January 1, 2010 Date Added to File: June 25, 2010
Failing Component:
Power Train:Automatic Transmission:Control Module (Tcm, Pcm)
Summary:
Pontiac/saturn/buick/GMC/chevrolet: transmission calibration update. A service procedure to reprogram the ecm and tcm on certain model vehicles. This new calibration will improve transmission shift characteristics for downshift hesitation


2 TSB Number: PIP-4653B NHTSA Number: 10032434 TSB Date: September 1, 2009 Date Added to File: March 24, 2010
Failing Component:
Power Train:Automatic Transmission:Control Module (Tcm, Pcm)
Summary:
Buick/chevrolet/HUMMER/GMC/pontiac/cadillac/saturn: technicians may find DTCs P0601, P0603, P0604, P062F or P1621 stored in the tcm as an active or a history code. Some of these DTCs can also be set in the ecm or fpcm.
 

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I have a 2010 4 cyl. Terrain that also had this happen to. It has actually happened 3 times and I only have 1800 miles on it. After the 2nd time it happened I took it to the dealership and they could find no codes but they knew of the problem. It sounds like it is happening to a few people with Terrains or Equinoxes. He said that there is nothing they could do at this time because mine had all the updated tsb's. I'm waiting for a new tsb and I'm glad that I am not alone. Maybe if the word gets out more, GM will work on a new program for the transmission.
 

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Discussion Starter · #6 ·
Well, it's been e few months now, taking my car in monday to get the tranny flashed to see if that gets rid of the issue i spoke about . It dont happen much " 6 times prox " with a total of 2500 miles on the car. I'l keep ya posted !
 
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