Diagnostic Aids
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
DTC C0561 is an indicator that the CCM receives an invalid message from the PCM, or EBCM, and does not necessarily indicate a fault is present with the CCM. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems. The PCM should be checked for possible faults.