U0253critical severityNetwork
Lost Communication with Collision Avoidance Module
on 2019 Audi A6 3.0L Turbo V6 · AWD
What this code 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
Repair notes
Safety critical ADAS system. Check fuses and sensor condition. Requires professional calibration after service.
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Other Network codes on this vehicle
00003
Control Module - Defective
01304
Radio - No Communication
01312
Powertrain Data Bus - Defective
01314
Engine Control Module (ECM) - no communications
01315
Transmission Control Module (TCM) - No Communication
01316
ABS Control Module - No Communication
01317
Instrument Cluster Control Module (J285) - No Communication
01318
Immobilizer Control Module - No Communication
01321
Airbag Control Module - No Communication
U0001
High Speed CAN Communication Bus