Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

The ignition is ON.
The ignition voltage is more than 5.23 volts.
DTC P0641 is not set.
DTC P2128 runs continuously when the above conditions are met.