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How to tell if the speedometer or the speed sensor is bad

Tiny
D45197
  • MEMBER
  • 1988 GMC SIERRA
My speedometer doesn't work. How can I tell if I need to replace the speedometer or the sensor?
Saturday, December 24th, 2011 AT 1:24 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the VSS 1st, if it test out then you go to the speedometer assy
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Saturday, December 24th, 2011 AT 1:50 AM
Tiny
D45197
  • MEMBER
  • 1 POST
Ok, what is the process for checking the VSS, and speedometer?
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Saturday, December 24th, 2011 AT 6:06 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
A diagionstic scan will normally show up a faulty speed sensor, this code will not set a check light, do a scan first.
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Sunday, December 25th, 2011 AT 8:19 AM

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