Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running.
The vehicle speed is 0 km/h (0 mph).
The ignition voltage is between 9-18 volts.
The transfer pump is activated.
A slosh delay of 20 seconds has passed.
DTC P2636 runs continuously when the above conditions are met.