U0253
NetworkModule Communicationcritical severityLost Communication with Collision Avoidance Module
What U0253 Means
Cannot communicate with the pre-collision or collision mitigation control module.
Symptoms
- Pre-collision warning disabled
- Automatic emergency braking off
- Collision avoidance system fault
- Safety system warning light
Common Causes
- Collision avoidance module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Sensor obstruction
- Calibration needed
Diagnostic Steps
- Check module fuse
- Test power and ground
- Check CAN wiring
- Clean all sensors
- Check for sensor calibration need
- Inspect front fascia for damage
Where to start: Safety critical ADAS system. Check fuses and sensor condition. Requires professional calibration after service.
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