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Home/DTC Codes/Lincoln/MKX/2016-2018 3.7L V6/C0121
C0121

Electronic Parking Brake Motor Overcurrent

2016-2018 Lincoln MKX 3.7L V6

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

  1. Command EPB apply and release, monitor current draw
  2. Inspect rear brake calipers for binding
  3. Check EPB mechanism for corrosion
  4. Test motor current draw with ammeter
  5. 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

C0120Electronic Parking Brake Motor CircuitC0122Electronic Parking Brake Switch Circuit

Other Chassis Codes

C0121 on Other Vehicles

Lincoln Aviator

2020-2024 3.0L Twin-Turbo V6

Lincoln Aviator

2020-2024 3.0L V6 Twin Turbo

Lincoln Aviator Grand Touring

2020-2024 3.0L Twin Turbo V6 PHEV

Lincoln Aviator Grand Touring

2020-2024 3.0L Twin-Turbo V6 Hybrid

Lincoln Aviator Grand Touring

2020-2024 3.0L V6 Twin Turbo Hybrid

Lincoln Continental

2017-2020 2.7L EcoBoost V6

Lincoln Continental

2017-2020 2.7L Twin-Turbo V6

Lincoln Continental

2017-2020 2.7L V6 Twin Turbo

Common Questions

What does code C0121 mean on a 2016-2018 Lincoln MKX?

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 Lincoln MKX?

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 2016-2018 Lincoln MKX?

Common causes of C0121 include: EPB motor seized or binding, Brake caliper seized, EPB cable or mechanism corroded, Motor brushes worn.

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