Conditions for Running the DTC

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.

DTCs P0601, P0602, P0603, P0604, and P0606 are not set.
The ignition is in Run, or Crank.
The ignition voltage is more than 5.23 V.
DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 run continuously when the above conditions are met.