Conditions for Setting the DTC
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The serial data message from the ECM to the FPCM does not agree with the state of the control enable circuit voltage supplied from the ECM to the FPCM for more than 2 seconds.