Home >> Land Rover >> 2021 >> Defender 90 X-Dynamic S >> Repair and Diagnosis >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: CHASIS Control Module (CHCM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Chassis Control Module (CHCM) (G3139555) >> Description And Operation >> Chassis Control Module (CHCM) >> DTC C1A06-28: Right Rear Height Sensor - Signal bias level out of range/Zero adjustment failure >> Possible Causes