Diagnostic Aids

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

The precharge resistor is rated at 12 ohms. If 11-13 ohms is measured across the HV+ and HV- at the positive contactor relay, the precharge current limit relay could be stuck closed.
A negative HV contactor relay stuck closed will not affect the precharge sequence.
A positive HV contactor relay stuck closed will also set DTC P0ADC.
The BECM will start a precharge wait timer after failing 2 consecutive precharge events.