C0191 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C0191 – Longitudinal Accelerometer Signal Voltage


C0191 Possible Symptoms


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


C0191 Possible Causes


Faulty Yaw Sensor/Lateral Accelerometer Sensor,Yaw Sensor/Lateral Accelerometer Sensor harness is open or shorted,Yaw Sensor/Lateral Accelerometer Sensor circuit poor electrical connection


C0191 Description


The ignition 1 circuit supplies 12 volts to the longitudinal accelerometer. When the vehicle is not moving, or is being driven at a constant, steady speed, longitudinal acceleration is 0 m/sec/sec (0 ft/sec/sec) and the longitudinal accelerometer signal voltage is very near 2.5 volts. This is referred to as longitudinal accelerometer bias voltage. Vehicle acceleration or deceleration causes the longitudinal accelerometer signal voltage to increase or decrease. The harder the acceleration or deceleration, the greater the change in signal voltage.