WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. 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
Battery Positive Voltage
P0A8D*
P0AFF**
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* DTC while Accessory Power Module is charging. **DTC with Accessory Power Module prior to charging.