OBD-II code · Chassis
C0521 Multi-axis Acceleration Sensor Module B Range/Performance
Multi-axis Acceleration Sensor Module B Range/Performance: the signal is implausible or outside the valid range.
Is it safe to drive with C0521?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor reading drifted
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Multi Axis Accel Module B
Related codes
- C051CMulti-axis Acceleration Sensor Module A Range/Performance
- C051EMulti-axis Acceleration Sensor Module A Intermittent/Erratic
- C051FMulti-axis Acceleration Sensor Module A Correlation
- C0520Brake Pedal Force Sensor Circuit
- C0522Multi-axis Acceleration Sensor Module B Missing Calibration
- C0523Multi-axis Acceleration Sensor Module B Intermittent/Erratic
- C0524Multi-axis Acceleration Sensor Module B Correlation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.