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1998 GMC Safari will not shift

Tiny
CEIU1967
  • MEMBER
  • 1998 GMC SAFARI
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 140,400 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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Monday, July 5th, 2010 AT 5:17 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
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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Thursday, July 8th, 2010 AT 8:15 AM

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