Chassis, generic

C0525 Multi-axis Acceleration Sensor Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

General fault of module B, without stating whether range, calibration, signal stability or correlation is at fault. No manufacturer publishes C0525, and the location of module B is not documented. According to Bosch, one inertial unit can feed stability control as well as the airbag electronics, and an integrated version exists; the 2013 Buick Regal, for example, carries its multi-axis sensor in a module of its own at GM. FCA files a comparable internal failure as C006A-49 on Ram pickups and says that replacing the ABS or occupant restraint module is unnecessary if the code clears after a software update. Whether module B means a second IMU or a sensor in another controller therefore depends on the make.

Likely causes

Software fault, fixed by an update of the host module
Internal electronic failure of module B
Supply or ground fault at module B

Symptoms

  • ESC, airbag-related or assistance warning depending on host module
  • Stability or assistance functions unavailable

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
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

C0520C0521C0522C0523C0524C006A

References: bosch-mobility.com, static.nhtsa.gov, static.nhtsa.gov.