1992 GMC C3500 Tranny

1992 GMC C3500
157,000 MILES
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ERROL H
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  • 7 POSTS
the transmission doesn't shift into drive. The check engine light is on,does engine performance affect transmission performance? The truck seems to run fine but it won't shift up into drive. The older trannys had a modulator valve to assist shifting but I don't know what the newer models are like.
Nov 18, 2013 at 5:44 PM
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HMAC300
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  • 48,601 POSTS
scan for codes first it may be an internal trans problem however.
Nov 19, 2013 at 6:21 AM
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MAXIMILIAM
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  • 436 POSTS
Thanks. I am having a problem with scanning the motor. Either the scanner isn't working or I don'y know what else it might be.

The scanner starts up and identifies the engine code but tells me that it can't retrieve and information from the computer. It tells me to hook up the connection which is already hooked up?

Errol H
Nov 21, 2013 at 1:25 PM
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