2004 Chevy Trailblazer speedometer question

2004 CHEVROLET TRAILBLAZER
68,900 MILES • 6 CYL • 4WD • AUTOMATIC
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MDFIELDS25265
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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?
Jan 7, 2009 at 10:58 AM
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MMPRINCE4000
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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.
Jan 8, 2009 at 8:32 AM
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MDFIELDS25265
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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.
Jan 8, 2009 at 11:15 AM
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MMPRINCE4000
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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.
Jan 10, 2009 at 6:32 AM
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MMPRINCE4000
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Check out the site, but also check with dealer on this specific vehicle.
Aug 7, 2009 at 8:03 AM