Lost Communication with Multi-Axis Acceleration Sensor
DTC U0125 indicates a loss of communication between the engine control module (ECM) or chassis control module and the multi-axis acceleration sensor module. This sensor measures longitudinal, lateral, and vertical G-forces, transmitting critical data over the CAN bus for stability control, ABS, and traction control systems. The communication failure prevents control modules from receiving the necessary information to operate these active safety systems properly.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty or failed multi-axis acceleration sensor module
- Open or short circuit in the CAN bus wiring
- Corroded, bent, or poor electrical connections in the sensor harness
- Power or ground supply issue to the sensor module
- Faulty CAN bus termination resistor
- Internal failure in the ECM or chassis control module
3. Symptoms You Will Notice
- Illuminated Check Engine Light or ABS warning light
- Loss of stability control, ABS, or traction control functionality
4. Step-by-Step Diagnosis
Scan for additional related DTCs to narrow down the issue
Inspect the multi-axis acceleration sensor connector for corrosion or damage
Check CAN bus wiring for continuity, shorts, and proper termination resistance
Verify power and ground at the sensor module
Test the sensor module by substitution if all wiring checks pass
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive because the loss of communication disables critical safety systems like stability control and ABS, increasing the risk of loss of vehicle control.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the issue is a simple wiring repair or requires replacing the sensor module.