Quote:
Originally Posted by Village Idiot
When I took mine to the dealership they said my TCM was up to date so I don’t think it’s software. Unless GM is aware of it and working on an update because that was maybe 1.5 months ago.
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The A10 trans. has a known issue with rough down-shifiting from 4th to 3rd only. it does shifts smoothly if you apply gas while downshifting (discovered that lately). I started noticing the rough downshifting after 15k, local dealer checked the car and said the trans. is working perfectly. I really dont know if its the same what your going through,, but if applying little gas fixes the issue then I am guessing that a software update could fix it.