I have replaced the speed sensors and fuel filter, air filters and almost everything, NO codes comes out and when i conect the computer to the truck show up that the truck is running on 75 MPH and actually the truck is only on 50 MPH
Any good sugestion ?Speed problem on a Peterbilt 378?
Sounds like the on board computer that controls engine output and speed may be defective. Do you have the correct codes for the transmission and the rear end? Both of these affect the actual speed. Also, do you need authorization codes from the engine manufacturer to modify the settings? I know this is necessary for some engines.
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