Test M: DTC C1991 - Module Calibration Failure

Pinpoint Test M: DTC C1991 - Module Calibration Failure

Normal Operation
The stability assist system needs to be recalibrated whenever a component specific to the system is disconnected or a new component is installed.

M1-M2:

M2-M4:

NOTE: The stability assist lamp flashes when a system calibration is required. Calibration is required after certain diagnostic trouble codes (DTCs) are cleared.

NOTE: Make sure the vehicle is not on a hoist and is sitting on level ground before carrying out stability assist module calibration.

Possible Causes
^ Anti-lock brake system (ABS) module
^ Sensor cluster
^ Steering wheel rotation sensor