OBD Guide
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C1821

Electronic Parking Brake Motor Failure

C1821 is an OBD-II diagnostic trouble code meaning: Electronic Parking Brake Motor Failure. Common causes: epb motor malfunction, problems with wiring harness or connections. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Inability to activate/deactivate the parking brake
  • Flashing EPB indicator on the dashboard
  • Error message on display
  • The parking brake does not hold the car

Causes

  • EPB motor malfunction
  • Problems with wiring harness or connections
  • EPB control module failure
  • Mechanical damage to brake mechanisms
  • Corrosion or contamination of components

How to Fix

  1. Check error codes using an OBD-II scanner
  2. Inspect the wiring harness and connections for damage.
  3. Check the functionality of the EPB motor
  4. Diagnose the EPB control module
  5. If necessary, replace faulty components
  6. Calibrate the EPB system after repair

Related codes

C1820C1822C1823C1824

FAQ

What does the C1821 code mean?

C1821 is an OBD-II diagnostic trouble code that indicates: Electronic Parking Brake Motor Failure

What causes a C1821 error code?

The most common causes of C1821 include: EPB motor malfunction; Problems with wiring harness or connections; EPB control module failure; Mechanical damage to brake mechanisms.

How do I fix a C1821 diagnostic trouble code?

To fix C1821: Check error codes using an OBD-II scanner. Inspect the wiring harness and connections for damage.. Check the functionality of the EPB motor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1821?

Do not drive — repair immediately

How much does it cost to fix C1821?

The estimated repair cost for C1821 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat