2003 Chevy Suburban speedometer

Tiny
JUDDRAY
  • MEMBER
  • 2003 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 148,552 MILES
Speedometer reads 80mph when going 25mph. Changed speed sensor 2 times from O'reillys. Went to GM and purchased and got same result. Each time a new speed sensor was installed (3 altogether) the speedometer started working perfect and after aprox 2 weeks starts eradict speeds. Surburban is now stuck at 50mph sitting in driveway. If I change the sensor it will automatic go to zero and work perfect.
Is it the part going bad or is something else causing my speedometer problem?
Thks in advance, Ray
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Monday, May 3rd, 2010 AT 1:48 PM

4 Replies

Tiny
JACK42
  • MEMBER
For something like this, it will need to go on a scanner to see if the computer is receiving a correct speed signal from the sensor. If the trans shifts correctly during all of this, the PCM is most likely getting a good signal and theproblem is in the instrument cluster or the signal between the PCM and the cluster
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Tuesday, May 4th, 2010 AT 8:17 AM
Tiny
JUDDRAY
  • MEMBER
I just don't understand when a new sensor is installed
it works perfect for approx 2 weeks.
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Tuesday, May 4th, 2010 AT 1:30 PM
Tiny
JACK42
  • MEMBER
Thats why we need to know what the signal is to the PCM when it is not reading correctly. Odds are good if you reinstalled the sensor that you replaced, it would be ok for a few weeks as well.
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Wednesday, May 5th, 2010 AT 7:52 AM
Tiny
CH3VYCR4ZY
  • MEMBER
These models had issues with the Instrument Cluster diodes. My 03 had same prob. I replaced the cluster (which is super easy to do) and all gauges returned back to normal. You can go to local parts dealer and you have to fill out a form (to verify mileage) along with your old cluster. Dorman was the parts manufacturer I used, I don't know if there is any others.
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Friday, April 15th, 2011 AT 10:18 PM

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