Conditions for Running the DTC

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

P2600, P2602, or P2603

The engine speed is greater than 80 RPM.
The ignition voltage is between 10 - 18 V.
The ECM has commanded the pump ON and OFF at least once during the ignition cycle.
The DTCs run continuously once the above conditions are met.

P2601

DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P2600, P2602, or P2603 is not set.
The ignition is OFF.
The engine coolant temperature (ECT) at engine shut down is warmer than 110 °C (230 °F).
The auxiliary coolant pump is enabled.
The DTC runs continuously once the conditions above are met for greater than 30 S.