Chassis, generic

C0524 Multi-axis Acceleration Sensor Module B Correlation

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

Module B's readings disagree with another source for the same motion, most likely module A or values computed from steering angle and wheel speeds. No manufacturer publishes C0524; Audi documents only the A counterpart. A Bosch patent places two sensor devices on opposite sides of the car and treats yaw rate as measured twice, directly and via the centrifugal accelerations at each spot, so a control unit can spot a device giving falsified data. A Hyundai/Kia design moves the yaw and g sensors into the airbag unit and sends them over CAN to the stability controller, a layout where the airbag and brake systems can each hold a set. Which side is wrong is left to further testing.

Likely causes

Module A or B rotated on its mount after repair or impact
Drifting sensor in one of the two modules
Software or timing fault in the comparing controller

Symptoms

  • ESC or assistance warning message
  • Stability or assistance functions limited

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–1,200
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

multi axis accel module b

Related codes

C051FC0521C0522C0523C0525

References: patents.google.com, patents.google.com.