Conditions for Setting the DTC
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
P1AFC
Motor control module 1 detects a loss of SPI bus communication with the hybrid powertrain control module.
P1AFD
Motor control module 1 detects a loss of SCI bus communication with motor control module 2 for 2 seconds.
P1B02
Motor control module 2 detects a loss of SPI bus communication with the hybrid powertrain control module.