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Originally Posted by Agriv8r
Aren't the speedometer for the HUMMER's now electronic, meaning there are no longer cables? And the speed is now computed throught the PCM? If this is correct then there is the possibility that the PCM may have enough variance input into it that it recalculates automatically. Have you paced the truck with another vehicle to see if the speedometer is wrong????
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Electronic and the speedo and odo are fed via the BCM, which calculates the PCM speed signal, and stores the information internally.
There are devices you can place inline with the vehicle speed sensor to fool the system.