Diagnostic Fault Information
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| PTLAN + 2 circuits at PIM |
U0074* | U189A* | U0074* | - |
| PTLAN - 2 circuits at PIM |
U0074* | U189A* | U0074* | - |
| Wake Up Signal circuit 968 |
B137A* in SDGM | U189A* ** | 1 | - |
| Wake Up Signal circuit 932 |
B137B* | U182A* | U189A* | - |
| Wake Up Signal Circuit 5985 |
U1814* in BCM | U1812* in HPCM | U209A* in SDGM | - |
| * Other modules/DTCs will set with this fault. ** Open at SDGM or BECM will set DTC U1812 in HPCM. Open at PIM will set DTC U189A in the HPCM. 1. Parasitic drain on battery, and may set DTC U1875, U1876, U1878, U1879 as history in the HPCM with the key ON, or as current with the key OFF. |
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