C0121
Electronic Parking Brake Motor Overcurrent
2012-2016 Subaru Impreza 2.0L H4
High SeverityChassisGeneric (SAE)
Description
The EPB motor is drawing more current than the module can supply.
Symptoms
- EPB warning light
- Parking brake partially applied
- Grinding noise when EPB activates
- EPB applies slowly
Common Causes
- EPB motor seized or binding
- Brake caliper seized
- EPB cable or mechanism corroded
- Motor brushes worn
Diagnostic Steps
- Command EPB apply and release, monitor current draw
- Inspect rear brake calipers for binding
- Check EPB mechanism for corrosion
- Test motor current draw with ammeter
- Lubricate EPB mechanism if accessible
Repair Notes
Replace EPB motor or caliper if mechanism is seized. Clean and lubricate if corrosion is the cause.
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
C0121 on Other Vehicles
Common Questions
What does code C0121 mean on a 2012-2016 Subaru Impreza?
C0121 stands for "Electronic Parking Brake Motor Overcurrent". The EPB motor is drawing more current than the module can supply.
What are the symptoms of C0121 on a Subaru Impreza?
Common symptoms of C0121 include: EPB warning light, Parking brake partially applied, Grinding noise when EPB activates, EPB applies slowly.
What causes C0121 on a 2012-2016 Subaru Impreza?
Common causes of C0121 include: EPB motor seized or binding, Brake caliper seized, EPB cable or mechanism corroded, Motor brushes worn.