1992 GMC C3500 diagnostic trouble

Tiny
ERROL H
  • MEMBER
  • 1992 GMC C3500
  • 157,000 MILES
When I try to diagnose the trucks system the obd11 does not give me any readings as if there is no power the the plug under the dash. Would a faulty computer cause this problem or is there somewhere else I can check? I have checked all the fuses and they seem fine, I check the continuity of all the fuseable links and they all seem fine, but I cannot scan the truck to detect the fault in the electrical system, also my transmission won't shift out of second gear into drive and I suspect the computer has something to do with the problem. I would like to know how to confirm the proper route to resolve the problems. Any advice you can suggest is greatly appreciated. I am fully prepared to change the computer if it seems necessary.
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Tuesday, November 19th, 2013 AT 7:55 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
Has the check engine light come on?
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Wednesday, November 20th, 2013 AT 5:22 AM

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