P0687, P0689, and P0690

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The battery voltage is between 10.5-18 V.
The ignition is OFF.
The powertrain relay has been commanded OFF.
These DTCs run continuously when the above conditions have been met.