Why is my GMC Duramax manual shift not working?
Why is my GMC Duramax manual shift not working? Turned out to be broken wires in the shifter at the joint in the steering column. If you don't have steering wheel controls you turn the key to on and pump gas pedal 6 times. If you have steering wheel controls its in the dic. Hang it!...Fire! you find out the cause of the issue? Thanks for the reply's. Yes my tow haul works. Why is my tow haul manual shift not working? Do work! My tow haul and manual shift stopped working last winter. Turned out to be broken wires...