Conditions for Setting the DTC
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
DTC C0561 71
The PSCM receives an invalid, vehicle speed message from the ECM.
DTC C0561 76
The PSCM receives the intermediate voltage power limit request message to ramp down the power assist due to a possible APM overheating event.