C0520Multi-axis Acceleration Sensor Module A
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- General fault of module A without a narrower fault type. GM gives the most detail: in the 2023 and 2025 OBD tables of its Super Cruise controller (EOCM3), C0520 watches the high-performance IMU and sets when initialisation does not finish in time, the unit resets, its temperature status is invalid, offset or orientation learning is missing, or a swapped IMU is detected via its serial number. GM rates it Special Type C, emissions neutral, so no check-engine lamp; adaptive cruise and Super Cruise are switched off. Audi lists C052000 on the 2019 e-tron next to C051F00 for module A in the suspension control module. Compared with C051C to C051F, the code says only that the module as a whole failed.
- What you may notice
- ESC warning lamp or service message for stability control
- Adaptive cruise or hands-free driving assistance unavailable (GM)
- No check-engine lamp
- Likely causes
- PossibleIMU fails to initialise in time or resets during operation
- PossibleModule swapped, offset or orientation calibration not learned
- PossibleSoftware fault in the module or the receiving controller
- RareInternal electronic failure of module A
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.