C0122moderate severityChassis
Electronic Parking Brake Switch Circuit
on 2022 Mazda Mazda3 2.0L I4 · AWD
What this code means
Malfunction in the EPB apply/release switch on the console or dashboard.
Symptoms
- EPB warning light
- Cannot apply or release parking brake
- Parking brake stuck in current state
Common causes
- Faulty EPB switch
- Switch connector corroded
- Wiring damage
- Switch not returning to neutral position
Diagnostic steps
- Test EPB switch with multimeter
- Check connector and wiring
- Monitor switch signal with scan tool
- Inspect switch for physical damage
Repair notes
Replace EPB switch assembly.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic