C051CMulti-axis Acceleration Sensor Module A Range/Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Module A delivers yaw rate and accelerations along several axes, but at least one channel sits outside what the vehicle's motion allows, for example a turn rate while parked or a lateral g that does not fit speed and steering. No manufacturer documents C051C publicly, so exact limits are unknown. Patents show why such checks matter: in a Kelsey-Hayes (now ZF) filing a sensor tilted by 5 degrees reports about 8.7 deg/s of yaw during a hard pitch, while stability control typically reacts at 3 to 7 deg/s; an Autoliv patent tracks slowly creeping offsets with a moving average. Unlike the calibration and correlation codes, here the reading itself is implausible. Stability control usually switches off with its warning lamp lit.
- What you may notice
- ESC or traction control warning lamp on
- Stability control unavailable or intervening without reason
- Yaw rate or acceleration not zero at standstill (scan tool)
- Likely causes
- LikelyModule A loose, tilted or mounted on a deformed bracket
- PossibleInternal offset of the inertial sensor drifted beyond tolerance
- PossibleDefective sensing element inside module A
- RareWrong module variant fitted or installed in the wrong orientation
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.