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When we turn on the head lights the tansmission wont shift out.

Tiny
SCOTTROD101
  • MEMBER
  • 1995 GMC VAN
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
When we turn on the head lights the tansmission wont shift out. We were told it was the computer. If it is were is the computer located at on a 1995 GMC vandura 2500 seriose van.
Friday, September 26th, 2014 AT 8:08 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Who told you it was a computer? The headlights and computers aren't tied together, so I really have to question that.

As far as the problem, what do you mean it won't shift out? Can you describe what happens? Has the check engine light come on?

Let me know. To me, it sounds like a ground problem and not a computer. By the way, which computer are they even referring to? Is it the PCM, TCM.?
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Friday, September 26th, 2014 AT 8:18 PM
Tiny
SCOTTROD101
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WHEN WE TURN ON THE HEAD LIGHTS THE TANSMISSION WONT SHIFT. Check engine light does not come on when you turn the head lights off the tansmission shift fine
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Friday, September 26th, 2014 AT 10:16 PM
Tiny
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The first thing I would do is start checking for body ground issues. Again, the PCM and TCM don't work with the transmission, so I feel it is most likely a bad ground.
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Saturday, September 27th, 2014 AT 5:37 PM
Tiny
SCOTTROD101
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It was a bad ground thank you for helping.
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Saturday, September 27th, 2014 AT 6:07 PM
Tiny
JACOBANDNICKOLAS
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Glad you found it. I had a feeling that was the issue. They can be a real pain!

Let me know if you have questions in the future.

Joe
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Saturday, September 27th, 2014 AT 7:15 PM

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