Gmc Automatic Transmission Problems 

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3 Comments

  1. Hi Mike, If you read the codes from the transmission control unit (may be called power train on that model), you will have a better idea of what is wrong with the transmission and why it is stuck in first gear.

  2. Mike Whitley says:

    2013 GMC Terrain. Installed new engine. Transmission worked fine with no problems. Now engine run as it should but transmission only has 1st gear. Hooked to analyzer and will not read just spins. Not reading. Any Ideas. All I can find is don’t buy a terrain. It’s a little late on that.

  3. Bob Hujdic says:

    I have a 2012 2500 GMC with a allison trany When the oil is minus 10C or colder it won’t move till the oil temp gets to minus 8C I had the oil and filter changed and flushed But the problem is still there. The shop said the oil was a little milky indicating water contamination. I belive that happaened when I backed into deeper water to unload my boat 18 months ago When the oil warms up it works 100%

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