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 |
|---|---|---|---|---|
| B+ | U1821* | U1821 | - | - |
| Ground | - | U1821* | - | - |
| PTLAN + | U0074* | U1821, 1 | U0074* | - |
| PTLAN - | U0074* | U1821, 1 | U0074* | - |
| * Other modules/DTCs may set with this fault. 1. Multiple DTCs including U1821 may set and multiple symptoms including a no start condition may occur. |
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