There may be high resistance in the G132 and G133 grounds, located behind the right-hand wheelhouse liner on some 2019-2022 Silverado 1500 and Sierra 1500 models. (Fig. 5) As a result, a loss of power steering assist or power braking assist may occur.
DTCs B127B (Rearview Camera Input Signal Circuit), B1325 (Control Module Power Circuit), B3205 (Driver Window Motor), C116C (Front Brake Pad Wear Signal Circuit), C1595 (Trailer Brake Signal to Trailer Brake Power Control Module Circuit), P25A2 (Brake System Control Module 1 Requested MIL Illumination), U0420 (Invalid Data Received from Power Steering Control Module) and/or U0422 (Invalid Data Received from Body Control Module) may be set.
Fig. 5
If these conditions are found, inspect the G132 engine ground strap (Fig. 6, #1) and G133 frame ground strap (Fig. 6, #4) for high resistance and repair as necessary. Check for any loose, stripped or corroded straps or connections. Refer to Ground Repair in the appropriate Service Information.
Fig. 6
For additional information, including part numbers, refer to Bulletin #23-NA-201.
– Thanks to Dave MacGillis
