Chassis, generic

C0520 Multi-axis Acceleration Sensor Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

IMU fails to initialise in time or resets during operation
Module swapped, offset or orientation calibration not learned
Software fault in the module or the receiving controller
Internal electronic failure of module A

Symptoms

  • ESC warning lamp or service message for stability control
  • Adaptive cruise or hands-free driving assistance unavailable (GM)
  • No check-engine lamp

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 asuspension control module

Related codes

C051CC051DC051EC051FC0525C006A

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.