Speedometer begins displaying inaccurate numbers around 10 MPH?

CHARLESTUCK

MEMBER
1999 CHEVROLET 1500
5.7L
V8
2WD
AUTOMATIC
17,500 MILES

My speedometer begins displaying inaccurate numbers around 10 MPH (as soon as I start rolling) and gets increasingly faster until the speed displayed is 50 MPH faster than the actual speed. At 50 MPH, my speedometer is displaying around 100. In short, the faster I go, the more inaccurate the speedometer. I use my GPS speed function to compare the speed.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,944 POSTS

Hi,

This could be related to a faulty speed sensor or even the instrument cluster is failing.

What I need to know is this. I need you to have the computer scanned to see if there is a P0500 or a P0501. If that is present, it is likely related to the sensor. If it isn't, we need to check wiring or issues to determine if the IP is actually.

Oftentimes, a parts store will scan the computer for you free of charge. Is it possible for you to have that done? Here is a link showing what I would prefer to have done if possible. If you can't have the entire can-bus checked, I know places like AutoZone have scan tools that could retrieve the codes.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know.

Joe

Speedometer begins displaying inaccurate numbers around 10 MPH?

1 Reply

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