C121A Code: Meaning, Causes, and Symptoms | OBD2 Codes

C121A – ABS Regenerative Axle Pressure Performance

 

C121A Possible Symptoms

 

Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)

 

C121A Possible Causes

 

Faulty Brake Pressure Modulator,Brake Pressure Modulator harness is open or shorted,Brake Pressure Modulator circuit poor electrical connection

 

C121A Description

 

The Electronic Brake Control Module (EBCM) uses input from the regenerative axle pressure sensor for more accurate control during a brake and vehicle stability enhancement system event. The regenerative axle pressure sensor is internal to the brake pressure modulator.