Diagnostic Aids: P0964

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.
If DTC P0964 is accompanied by DTC P0972, and/or DTC P0975, and/or DTC P0978, the open is most likely in the HSD2 circuit.