OBD-II trouble code
U0125: Lost Communication with Multi-Axis Acceleration Sensor Module
A module on the network can no longer hear from the multi-axis acceleration sensor — the yaw/lateral-acceleration sensor used by stability control. Often a power, ground, or wiring fault, and stability and traction features typically disable themselves.
Quick facts
- System
- Network
- Category
- Network Communication
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $100 – $900
- DIY difficulty
- Shop recommended
What does U0125 mean?
U0125 is set when a module on the vehicle's communication network — usually the stability control (ESC/ABS) module — stops receiving messages from the multi-axis acceleration sensor module. This sensor measures the vehicle's yaw rate and lateral (and sometimes longitudinal) acceleration, telling the stability system how the body is actually rotating and sliding. The electronic stability control system compares that motion against where the driver is steering to decide when to intervene. When the network loses contact with the sensor module, U0125 records the dropout.
The causes follow the familiar communication-code pattern. The sensor module may have lost power or ground through a blown fuse, corroded ground, or failed relay. The CAN wiring or connector at the module can be damaged or corroded — the sensor is often mounted low and centrally (under the console or seat), where moisture or a spill can reach it. The module's internal communication circuitry can fail, or another module on the bus can disrupt communication for everyone. Low system voltage from a weak battery or charging fault can also cause intermittent dropouts.
Because stability control needs trustworthy motion data, losing this sensor typically causes electronic stability control, traction control, and sometimes hill-assist or rollover-mitigation features to disable themselves and light their warning lamps. The vehicle still drives and brakes normally through the conventional system, but the electronic safety aids are offline. U0125 is not usually an emergency on dry roads, but because those aids matter most in poor traction, it should be diagnosed promptly.
Common causes
- Blown power or ground fuse for the acceleration sensor module
- Corroded or loose ground at the module
- Damaged CAN wiring to the sensor module
- Corroded or backed-out terminals at the module connector
- Moisture or spill intrusion at the under-console or under-seat mount
- Failed internal communication circuitry in the sensor module
- Another module on the bus disrupting network communication
- Low system voltage from a weak battery or charging fault
Symptoms
- Stability control (ESC) and traction control warning lights on
- ABS warning light may also be on
- Hill-start assist or rollover-mitigation features disabled
- Scan tool can't communicate with the acceleration sensor module specifically
- Multiple related chassis/network codes stored alongside U0125
- Symptoms may be intermittent with a marginal connection
- Vehicle still drives and brakes through the conventional system
Diagnostic steps
- 1.Scan all modules; confirm the acceleration sensor module is the one that's unreachable while others respond.
- 2.Check the module's power and ground fuses and the relevant relays.
- 3.Inspect the module ground point and connector for corrosion, looseness, and moisture intrusion at its mount.
- 4.Measure CAN-High and CAN-Low at the module connector (rest near 2.5 volts) and verify continuity back to the bus.
- 5.Test the battery and charging system, since low voltage can cause intermittent communication loss.
- 6.If power, ground, and wiring are good but the module still won't communicate, the sensor module itself is the likely failure and may need replacement and calibration.
Repair cost
$100 – $900
A blown fuse, corroded ground, or connector repair is the cheapest fix at $100-$300 once located. Wiring repair runs $200-$600. Diagnostic time commonly adds $150-$300. Acceleration sensor module replacement is the most expensive outcome at $300-$900 including any required calibration, and is a last resort after cheaper causes are eliminated.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with module communication / can bus diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
Leave this one to a qualified shop. It typically involves emissions-critical components, refrigerant handling, or other work that requires manufacturer-grade tooling, training, or certification. DIY attempts often produce a more expensive problem than the original code.