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-   -   Calibrate Speedometer (http://forum.gopowerhungry.com/showthread.php?t=10089)

stangjr Mon, August 4th, 2025 02:54 PM
Calibrate Speedometer
 
Trying to calibrate my speedo for the new tires and im not sure its doing anything. I adjusted the revs per mile to what the new tires are and my GPS is still showing 4-5 mph higher than speedometer. Original tires revs per mile was 649 i think and my new tires are 579...
Any advice would be much appreciated.

cleatus12r Wed, January 7th, 2026 09:50 AM
I know this is a very old post, but the Anti-lock Brake Module controls the speedometer. The Vehicle Speed Sensor's first stop is the ABS module where the AC sine wave from the variable reluctance output is converted to a digital signal read by numerous modules in the vehicle.

Certain scan tools have the ability to reset the revs/mile in the ABS module as the PCM has nothing to do with it.

stangjr Wed, June 3rd, 2026 03:46 PM
Quote:
Originally Posted by cleatus12r (Post 63464)
I know this is a very old post, but the Anti-lock Brake Module controls the speedometer. The Vehicle Speed Sensor's first stop is the ABS module where the AC sine wave from the variable reluctance output is converted to a digital signal read by numerous modules in the vehicle.

Certain scan tools have the ability to reset the revs/mile in the ABS module as the PCM has nothing to do with it.
You were absolutely correct sir.
I got a license for forscan and the OBD2 to USB adapter and boom i was able to correct my speedometer.

cleatus12r Wed, June 3rd, 2026 04:03 PM
Nice!

Glad to see you were able to correct the issue!


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