U0125Lost Communication With Multi-axis Acceleration Sensor Module A
- Generic OBD-II code · Network
- How the car detects it
- U0125 concerns the inertial measurement unit that bundles yaw rate plus lateral and longitudinal acceleration on one bus node. GM uses the code widely: the 2019 XT4 brake controller (EBCM) flags a missing IMU frame after 0.1 s, the 2025 object-detection module after 0.05 s and then disables adaptive cruise; both are Type C without MIL. Saab's 9-5 list adds symptom bytes 71, 72 and 74 for invalid data, wrong message counter and checksum. Field cases: a broken wire at connector X411 under the left rear (Equinox/Terrain, PIT5171B) and an EBCM reflash for 2020 Equinox (N192285670). Stellantis calls the part Dynamics Sensor. U0123/U0124 name single-axis modules instead.
- What you may notice
- Service ESC / StabiliTrak message, traction and ABS lamps
- Adaptive cruise control or all-wheel drive unavailable
- Electric parking brake warning on some models
- Likely causes
- LikelyWire broken inside the insulation or rubbed through near a chassis connector (GM X411)
- PossibleLoose or corroded plug at the inertial sensor
- PossibleBrake controller software that drops the sensor (reflash released)
- RareMulti-axis sensor internally faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.