Speedometer dial stays at 45

Tiny
CHEVYMAN200
  • MEMBER
  • 1991 CHEVROLET TRUCK
  • 6 CYL
  • 4WD
  • MANUAL
  • 200,000 MILES
The check gauge light is on and the speedometer dial stays at 45
Monday, July 20th, 2009 AT 5:57 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It sounds like the vehicle speed sensor (VSS), has malfunctioned and not sending signal.
The VSS measures the transmission shaft rotation and sends that information to the ECM and that gets translated into the gauge as the speed that you see.
The VSS is located on the back of the transmission on the driver side (see diagram below).

Please let me know of any questions.
Thank you.
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Thursday, October 21st, 2021 AT 1:28 PM

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