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Speedometer Not Working

Tiny
EXCOACH
  • MEMBER
  • 2005 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 66,000 MILES
I have been to 2 dealers and 1 mechanic and still the speedometer reads at 0. The '05 Suburban did qualify for a special GM policy and I had the instrument cluster replaced. Driving off the dealer lot the speedometer did not budge (so much for the road test!). My mechanic had narrowed down the problem to the likely suspect of the instrument cluster. The speed sensor is reading accurately out of the transmission. The computer seems to be getting the speed data as well. So could be a problem with the computer (BCM?) Or the wires to the instrument cluster. I have no idea where these are located. Any idea where a novice mechanic should start the next round of troubleshooting?
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Monday, November 9th, 2009 AT 9:34 PM

1 Reply

Tiny
EXCOACH
  • MEMBER
  • 3 POSTS
The last visit at the dealership I had the instrument cluster replaced (at no cost under the GM special policy). That did not fix the problem. Am looking at maybe the BCM or wiring to/from the BCM. Not sure where those are located or if the dealer needs to test the BCM.
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Wednesday, May 26th, 2021 AT 11:24 AM

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