B0422high severityBody
Brake Warning Lamp Circuit
on 2013 Audi A6 3.0L Supercharged V6 · AWD
What this code means
Malfunction in the brake warning lamp circuit. This includes the parking brake and low brake fluid indicators.
Symptoms
- Brake warning light always on
- Brake light does not illuminate with parking brake
- No low-fluid warning capability
Common causes
- Faulty brake fluid level switch
- Parking brake switch failure
- Cluster lamp fault
- Wiring issue
Diagnostic steps
- Check brake fluid level
- Test parking brake switch
- Test brake fluid level switch
- Check lamp circuit
- Inspect wiring
Repair notes
Check brake fluid level first. Replace faulty switch or repair wiring.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0005
Driver Knee Airbag Deployment Circuit