Speedometer adjustment

[dacbobc4]

Can the digital speedometer be reset (adjusted) on a 95 LT1? It is off by 18 mph at 70 mph. Also affected is the miles traveled. Any ideas how to remedy the problem?

[fatherlarry]

You have to go to a Chevrolet
Dealer to send the speedometer head out.
It's Against the LAW to play with the speedometer.
:usaribbon

[Red Dwarf]

Could you possibly have K/MS' selected instead of MPH"S?

[HT99+63]

Yes K/MS' can be selected .;bt

[dacbobc4]

It is set for MPH. What is a PCM and what does it have to do with the odometer and speedometer?

[Red Dwarf]

The problems you are having are controlled by the CCM, Central Control Module.

The PCM/ECM will normally take care of the power train functions.

Do you have the factory service manuals? If not there is a procedure
for pulling trouble codes from the CCM which will probably tell where your problem (s) are.

If you want to attempt pulling the codes yourself I can send you info on that aspect. If not, maybe you have a competent mechanic who can do it for you.

[dacbobc4]

Thanks so much for the info. I'm taking the car to a corvette specialist next week and hopefully he will know how to do it. If not I would appreciate any info and help you can give me. I'll let you know what he says next week.

dacbobc4

[TD1993]

If you or the previous owner have changed the rear gear you will need a speedometer calibrator to reset signal. and compensate for change. the same holds true if the Tire hieght has been modified from original....