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2004 Chevy Trailblazer speedometer question

Tiny
MDFIELDS25265
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 68,900 MILES
The speedometer on my Trailblazer starting not working properly yesterday. While driving it yesterday, when you made a complete stop the speedometer does not fall below the 25-30 mph range. This morning when I started it the speedometer was at the 55-60 mph range while parked in my driveway. I have no idea how fast I am going while I am driving. All the rest of the guages are working. What could be causing this problem? Is this something that is simple to fix?
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Wednesday, January 7th, 2009 AT 10:58 AM

4 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Either the VSS (vehicle speed sensor) is bad or the IP, check with the dealer on any TSB's concerning this problem, it may have a recall on the problem.
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Thursday, January 8th, 2009 AT 8:32 AM
Tiny
MDFIELDS25265
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  • 3 POSTS
How can you determine exactly which vehicle speed sensor needs replaced. I have just spoken to a auto parts store and was told that there are more than one on my vehicle.
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Thursday, January 8th, 2009 AT 11:15 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Check with dealer parts dept. One may be PCM feedback while the other is speedometer gauge.

I would still check with dealer on the IP recall. I seem to remember some ongoing problems with Trailblazer/Envoy IP's going bad.
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Saturday, January 10th, 2009 AT 6:32 AM
Tiny
MMPRINCE4000
  • MECHANIC
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Check out the site, but also check with dealer on this specific vehicle.
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Friday, August 7th, 2009 AT 8:03 AM

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