C006A: Multi-axis Acceleration Sensor
What to do
The ordinary brakes are unaffected — what has switched off is the system that catches a skid for you. The car will feel completely normal until the moment it would have intervened, which is exactly when you will not want it missing. Drive gently in the wet and cold and get it diagnosed.
What this code means
The multi-axis acceleration sensor has reported a fault.
Stability control needs to know what the car is actually doing, not just what the wheels are doing.
The wheel speed sensors say how fast each wheel turns. The steering angle sensor says where the driver is pointing. The inertial sensors say how the body is really moving — yaw is rotation about the vertical axis, lateral acceleration is the sideways push, longitudinal is braking and accelerating, roll is lean.
Stability control is the comparison between the two. If the driver is asking for a curve the car is not following, the system brakes individual wheels — and sometimes cuts engine torque — to rotate the car back onto the intended path. It cannot make that comparison with a sensor missing, so it shuts down rather than act on a partial picture.
A multi-axis sensor is the whole inertial picture in one part — lateral, longitudinal and yaw together, and on many vehicles roll as well. Modern designs are a single silicon chip with tiny sprung masses etched into it, which is why what used to be several sensors is now one small module.
The consequence for diagnosis is that it fails as a unit. There is no repairing one axis, and a fault here disables everything downstream of it at once — stability control, traction control, rollover mitigation and hill-hold.
It shares the mounting and calibration traps of the individual sensors: rigid, correctly oriented, and calibrated at rest on level ground.
The most important thing first: the car still stops.
ABS, traction control and stability control are all additions to a braking system that works without them. When the module finds a fault it switches itself off and hands back a conventional, fully hydraulic brake system — the pedal, the master cylinder, the lines and the calipers are untouched. You have not lost your brakes.
What you have lost is the help. Without ABS the wheels can lock under hard braking, which lengthens the stopping distance on a slippery surface and — the part people forget — takes away your ability to steer while braking hard, because a locked wheel cannot generate cornering force. Without stability control the car will not catch a slide for you.
So drive it, but drive it as though it were forty years old: brake earlier, leave more room, and be especially careful in rain, snow and on gravel.
Likely causes
Start here
- Faulty yaw rate or acceleration sensor · specialist
- Corroded or loose connector · specialist
Less common
- Sensor calibration not performed after repair · moderate
- Sensor module loose or incorrectly mounted · specialist
- Damaged wiring harness · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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