Automatic Emergency Braking System Fault
2018-2018 Audi A6 3.0L Supercharged V6
The 2018 Audi A6 is equipped with a 3.0L V6 engine. Below you'll find detailed c0440 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
General malfunction in the automatic emergency braking system.
Symptoms
- AEB warning light
- Automatic braking disabled
- Forward collision mitigation unavailable
- Driver assist systems degraded
Common Causes
- Radar module fault
- Camera system error
- Brake system unable to support AEB
- Module communication failure
Diagnostic Steps
- Check for radar and camera codes
- Verify ABS/brake system is fully functional
- Test communication between AEB controller and brake module
- Inspect all AEB-related sensors
- Check for software updates
Repair Notes
Diagnose root sensor or brake system fault. AEB relies on both detection and braking subsystems.
Related Codes
Other Chassis Codes
- C0021LF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0025LF Wheel Speed Sensor Circuit Intermittent
- C0026RF Wheel Speed Sensor Circuit Intermittent
- C0027LR Wheel Speed Sensor Circuit Intermittent
- C0028RR Wheel Speed Sensor Circuit Intermittent
- C0035Left Front Wheel Speed Sensor Circuit
- C0036Left Front Wheel Speed Signal Erratic
C0440 on Other Vehicles
Common Questions
What does code C0440 mean on a 2018-2018 Audi A6?
C0440 stands for "Automatic Emergency Braking System Fault". General malfunction in the automatic emergency braking system.
What are the symptoms of C0440 on a Audi A6?
Common symptoms of C0440 include: AEB warning light, Automatic braking disabled, Forward collision mitigation unavailable, Driver assist systems degraded.
What causes C0440 on a 2018-2018 Audi A6?
Common causes of C0440 include: Radar module fault, Camera system error, Brake system unable to support AEB, Module communication failure.
Last updated: March 2026