94 GMC Sierra
#1
04-07-2011, 07:04 AM
94 GMC Sierra
How can I find out if my ECM is bad. Recently replaced transmission (4L60E), problem persisted. Shifts into all gears (P - R - N - D), but will not shift through the Drive gears (1st - 2nd -3rd etc). If ECM is bad, how do I know which one is for the truck? There's several different part numbers.
#2
04-07-2011, 07:14 PM
You need to pull your computer and get the number off of it. Does your service engine light come on and turn back off when you turn the key on?
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