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Speedometer erratic

Tiny
BK2WRK
  • MEMBER
  • 1987 GMC S15
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 586,000 MILES
Due to a bad speedometer cable on my '87 gmc s15, the speedometer needle was erratic at times. I've since replaced it. My question is does this bouncing needle cause the vehicle speed sensor to give the computer bad information concerning transmission shifting? I had a problem with the torque converter shifting back and to at about 30 mph for no reason.
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Tuesday, February 1st, 2011 AT 10:28 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Yes it could cause it as the VSS is on the insstrument cluster. But you should have the trans checked as you may have a bad torque converter clutch switch as well. Have a trans guy check it out.
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Thursday, February 24th, 2011 AT 10:33 PM

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