Conditions for Setting the DTC
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
C012B 01 or C12B7
A short to battery is detected on the sensor signal circuit.
C012B 06 or C12B6
A short to ground or open is detected on signal circuit.
C012B OF or C12B8
Signal is erratic and changes faster than physically allowed.