B0422
Brake Warning Lamp Circuit
2014-2021 Mazda Mazda6 2.5L I4 🇨🇦
High SeverityBody
Description
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.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0009Rear Center Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
B0422 on Other Vehicles
Common Questions
What does code B0422 mean on a 2014-2021 Mazda Mazda6?
B0422 stands for "Brake Warning Lamp Circuit". Malfunction in the brake warning lamp circuit. This includes the parking brake and low brake fluid indicators.
What are the symptoms of B0422 on a Mazda Mazda6?
Common symptoms of B0422 include: Brake warning light always on, Brake light does not illuminate with parking brake, No low-fluid warning capability.
What causes B0422 on a 2014-2021 Mazda Mazda6?
Common causes of B0422 include: Faulty brake fluid level switch, Parking brake switch failure, Cluster lamp fault, Wiring issue.