▲ 4 r/Cummins
My speedometer reads bad as of yesterday. It’s in the right general area, but will constantly sweep around 15-20 under where I am cruising.
I already replaced the rear speed sensor, and my tuner is also reading inaccurate through the OBD.
Should I start looking at wires? Or is there a module I should check first?
u/-YeahToasty- — 7 days ago