Blind Spot Monitor Sensor Circuit
2013-2013 Audi A6 3.0L Supercharged V6
The 2013 Audi A6 is equipped with a 3.0L V6 engine. Below you'll find detailed b2402 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Malfunction in the blind spot monitoring (BSM) radar sensor, typically mounted in the rear bumper.
Symptoms
- Blind spot indicators not illuminating
- BSM warning light on dashboard
- System unavailable message
- False blind spot alerts
Common Causes
- Faulty BSM radar sensor
- Sensor obstructed by bumper damage or dirt
- Sensor misaligned after rear collision
- Wiring damage
- Aftermarket trailer hitch blocking sensor
Diagnostic Steps
- Clean rear bumper in sensor area
- Inspect for bumper damage near sensors
- Check sensor wiring
- Scan BSM module for codes
- Verify no aftermarket accessories blocking sensor
Repair Notes
Replace BSM sensor or repair wiring. Recalibrate after replacement. Check for bumper damage blocking sensor field of view.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0005Driver Knee Airbag Deployment Circuit
B2402 on Other Vehicles
Common Questions
What does code B2402 mean on a 2013-2013 Audi A6?
B2402 stands for "Blind Spot Monitor Sensor Circuit". Malfunction in the blind spot monitoring (BSM) radar sensor, typically mounted in the rear bumper.
What are the symptoms of B2402 on a Audi A6?
Common symptoms of B2402 include: Blind spot indicators not illuminating, BSM warning light on dashboard, System unavailable message, False blind spot alerts.
What causes B2402 on a 2013-2013 Audi A6?
Common causes of B2402 include: Faulty BSM radar sensor, Sensor obstructed by bumper damage or dirt, Sensor misaligned after rear collision, Wiring damage, Aftermarket trailer hitch blocking sensor.
Last updated: March 2026