2002 Pontiac Bonneville speedometer/odometer not working

Tiny
MARK2341
  • MEMBER
  • 2002 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 86,000 MILES
Speedometer & odometer not working. Although they do work once in a while. Sometimes the speedometer flutters up and down.
Thursday, August 13th, 2009 AT 10:20 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
To diagnose if it's the cluster, the VSS, the cruise sontrol mod, or HUD, you need a scantool that can read the U codes and also collect live data from the speed sensor. Testing is done by running the car on a lift(front wheels), Measuring the speed on the speedo, and the VSS input to see if they match, testing the VSS fort shorts to ground, or power. If you have such a tool, I will send the test info to you. GM TechII scan tool needed!
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Thursday, August 13th, 2009 AT 1:51 PM

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