U0253critical severityNetwork
Lost Communication with Collision Avoidance Module
on 2014 Audi Q5 3.0L Supercharged 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.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus