Multiple Electrical Concerns Due to Wiring Harness Contact

There may be several electrical conditions on some 2017-2018 Silverado and Sierra and 2019 Silverado LD and Sierra Limited models. The conditions may include several illuminated brake and traction control MILs, steering-related Driver Information Center (DIC) messages, inoperative tail lamps or rear turn signals, inoperative rear camera, and intermittent communication issues. These conditions may be due to damage to a multi-wire bundled harness.

In addition, one or more of the following DTCs may be set: C0035, C0040, C0045, C0050, C0710, C1115, C1116, C1117, C1118, P0449, P0453, P0499, P129D, P2537, P2537, U007D, U0073, U0074, U0077, U0100, U0101, U0121, U0126, U0137, U0140, U0151, U0415, U0428, U1556, and/or U18A2.

Not all conditions or DTCs may be present. Different conditions and driver notifications may be caused by the control module and wiring harness at the module. Due to the cause of the condition, and the position of the wires in the harness, it is unlikely that more than one circuit will be affected by the condition.

Check for high resistance, opens, shorts and damaged circuits in the chassis and Electronic Brake Control Module wiring harness. Look for any corrosion or contact with the chassis.

Areas to inspect where there may be contact with the wiring harness include at the body (Fig. 9, #1) and rear crossmember. (Fig. 9, #2)


Fig. 9


Check the frame/leaf spring support bracket. (Fig. 10)


Fig. 10


Also check the cargo box or bed mount. (Fig. 11)


Fig. 11


Inspect the wiring harness point of contact and repair any damaged wiring as needed. Tape all repaired contact points of the harness using Woven Polyester Electrical Tape (PET) in a double layer. If required, reposition the harness away from the area of contact.


– Thanks to Bob Hartman


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