WILL NOT SHIFT

1998 GMC Safari

Tiny

ceiu1967

July, 5, 2010 AT 5:17 PM

Transmission problem
1998 GMC Safari 6 cyl All Wheel Drive Automatic 140400 miles

At the same time I realized that my spedometer was not working, I noticed my transmission was not shifting. I can only travel about 15 mph and then the engine just revs. It will not change gears. Don't know if it is related but the anti-lock light is on on the dash board also. Any ideas what is causing this and how bad the repair may be?

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Trans Not Shifting

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Tiny

Jack42

July, 8, 2010 AT 8:15 AM

Without a scan of th ePCM, it may be the VSS (vehicle speed sensor) do all other dash lights and instruments work properly? If so it could be the VSS, with out speed signal the ABS and the trans dont know when to shift or if the wheels are even turning. The VSS is located in the tailshaft of the trans/

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