Chassis, generic

C051D Multi-axis Acceleration Sensor Module A Missing Calibration

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The module holds no valid zero point or mounting orientation, typically after it or the brake controller was replaced and the setup step was skipped. Corrections like these live in non-volatile memory: Kelsey-Hayes measures the offset of the whole assembly on a turning stand and adds the in-car tilt. GM's Saab 9-4x shows the workshop side: a new multi-axis module (called IMU in the programming tool) must first be configured, then the yaw sensor learned on level ground. On its Super Cruise controller GM files missing offset or orientation learning and a detected swap of the high-performance IMU under C0520 instead. No public source uses C051D itself. Stability control stays off until the learn is done.

Likely causes

Module A or brake control module replaced without configuration and yaw sensor learn
Learn procedure aborted, e.g. vehicle not level or voltage dropped
Stored calibration lost after software update or module fault

Symptoms

  • ESC warning lamp on right after a repair
  • Stability and traction control unavailable
  • Driver assistance such as adaptive cruise may be disabled

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–200
Time0.3–1 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

multi axis accel module a

Related codes

C051CC051EC051FC0520C0522

References: saabwisonline.com, saabwisonline.com, patents.google.com, gsi.ext.gm.com.