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Q: tranny flushed at a shop and since then the shift inhibitor light comes on on 2004 GMC Sierra 2500 HD

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and the truck goes into neutral and i have to shut the truck off in order for the truck to go into gear, sometimes in goes into first gear and i have to shut it off again and the engine light goes off
(2) Answers
(1) Comments
How many miles on it and ahd the trans EVER been serviced before? Probably sludge contamination -How many miles did the shop test drive it , before returning it to you (if any)?