Conditions for Setting the DTC
WARNING: This page is about a different car, the 2005 Suzuki Swift +, 2005 Pontiac Wave, and 2005 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
DTC C1203 can be set anytime the key is ON and the EBCM has detected an open, short to ground, or a short to battery on the right front wheel speed circuit.