C0191 - Longitudinal Accelerometer Signal Voltage

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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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

Possible symptoms

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

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.
OBDII Code C0191 - Longitudinal Accelerometer Signal Voltage - AutoCodes.com

C0191 Information for specific makes

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C0191 Comments

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