Just after replacing the ECM the tranny won't shift into 1st. The original ECM failed causing the truck to not start or run. I believe it's stuck in a "limp mode" for transmissions. No codes, no blinking O/D, no check engine...
TPS?
Shift solinoid?
Speed sensor?
Truck wants to stall on cold start, deal with it by one or two taps on the throttle.
Thanks.
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