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What would make a speedometer read incorrectly?

Tiny
NKBRASWELL
  • MEMBER
  • 2001 PONTIAC GRAND AM
  • 198,500 MILES
I have a pontiac grand am that the speedometer is reading faster than I am going. It's about 2 mph off, under 50, and 5 mph over 50. All other gauges seem to work just fine, and tires are the correct size.
Wednesday, November 9th, 2011 AT 10:49 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Have you had any transmission work done lately?

There is a speed sensor for the speedometer that may be reading wrong or has the wrong ring for the speedometer.

Roy
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Wednesday, November 9th, 2011 AT 11:17 PM
Tiny
BILLYBOB
  • MECHANIC
  • 27 POSTS
HAVE YOU PUT OVER SIZED TIRES ON IT? IF SO THAT WOULD CHANGE IT
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Thursday, November 10th, 2011 AT 12:42 AM
Tiny
NKBRASWELL
  • MEMBER
  • 2 POSTS
No tranny work or over sized tires. I didn't know how long it has been wrong. I got pulled over the other day. The officer said I was going 66, but I had the cruise set at 60. So I downloaded a GPS speed tracking app. It seems to confirms the problem.
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Thursday, November 10th, 2011 AT 10:31 PM

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