C1101 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C1101 – Brake Booster Vacuum Sensor Performance


C1101 Possible Symptoms


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


C1101 Possible Causes


Faulty Brake Booster Vacuum Sensor,Brake Booster Vacuum Sensor harness is open or shorted,Brake Booster Vacuum Sensor circuit poor electrical connection


C1101 Description


The Electronic Brake Control Module (EBCM) provides a power 5-volt reference to the brake booster vacuum sensor. The brake booster vacuum sensor converts the change in vacuum levels in the brake booster into a voltage signal. This signal is sent to the EBCM. The voltage signal ranges, from 0.13 to 3.30 volts depending on vacuum levels. The low reference is the return side of the sensor to ground.