2003 silverado 2500 duramax/allison. Tow/haul, overdrive overide is not working. Noticed it when the dash indicator light did not come on when switch on shift lever is pushed. I looked in owners manual for a fuse that might be blown. No luck. Any ideas.
Chevrolet 2500 durimaxAlready Tried: nothing
Ok, remove the steering column upper shroud and inspect the orange wire for a break in the wire between the shift lever and the electrical connector on top of the steering column. It's common for these to break as the shifter movement weakens the wire and eventually it breaks. If that's the case replace the shift lever (comes with new switch and short harness) and retest.
Steering Column Trim Covers Replacement Removal Procedure
Caution: Refer to SIR Caution in the Preface section.
Important: You must check for 2 pan head tapping screws (1,2) in the lower trim cover before removal.
If screws are not present in the lower trim cover, proceed to the next step.
Important: You must check for 1 TORX® head screw (1) in the upper trim cover (2) before removal.
If a screw is not present, remove the upper trim cover (2).
Notice: Refer to Fastener Notice in the Preface section.
Important: If the snap on/off feature on the trim covers was damaged during the removal procedure, you MUST use screws for the installation procedure. If screws were present in the trim covers before the removal procedure, you MUST use the screws during the installation procedure.
Tighten Tighten the screw to 1.5 N·m (13 lb in).
Important: If column shift, the shift lever seal must be seated in the trim covers.
Tighten Tighten the 2 pan head tapping screws to 3.5 N·m (31 lb in).
GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified