Diagnostic Aids: P0979

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.

You may have to drive the vehicle in order to experience a condition.
DTC P0979, set in combination with DTCs P0964 and P0975, may indicate an open in the HSD2 circuit.