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Engine-Codes – Generic – C1821

C1821 Code - Electronic Parking Brake Motor Failure

Quick Answer

The diagnostic code C1821 indicates a failure in the electronic parking brake motor of the vehicle. Common causes include Electrical failure in the parking brake motor, Mechanical issues in the parking brake mechanism, Software malfunction in the control module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
C1821 indicates Electronic Parking Brake Motor Failure.
Common causes
Common causes include Electrical failure in the parking brake motor, Mechanical issues in the parking brake mechanism, Software malfunction in the control module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code C1821 Description

The diagnostic code C1821 indicates a failure in the electronic parking brake motor of the vehicle. The electronic parking brake system is designed to replace the traditional handbrake lever with a switch or button that activates the brakes electronically. The motor failure can prevent the parking brake from engaging or disengaging properly, leading to issues with parking the vehicle safely.

OBDII Code C1821 - Electronic Parking Brake Motor Failure
C1821 Code - Electronic Parking Brake Motor Failure

Common Causes of C1821

  1. Electrical failure in the parking brake motor
  2. Mechanical issues in the parking brake mechanism
  3. Software malfunction in the control module
  4. Wiring issues or poor connections in the electronic parking brake system
  5. Overuse or excessive wear on the parking brake motor

Symptoms of C1821

  1. Parking brake warning light on the dashboard
  2. Parking brake not engaging or releasing properly
  3. Unusual noises coming from the electronic parking brake system
  4. Vehicle rolling when parked on an incline
  5. Difficulty in applying or releasing the parking brake

How to Fix C1821

  1. Diagnose the specific cause of the electronic parking brake motor failure using a diagnostic scanner.
  2. Inspect the wiring and connections in the parking brake system for any faults or damage.
  3. Replace the faulty parking brake motor or control module as needed.
  4. Test the electronic parking brake system to ensure proper functionality.
  5. Clear the diagnostic trouble code and reset the system if necessary.

Cost to Fix C1821

The cost of repairing an electronic parking brake motor failure can vary depending on the make and model of the vehicle, as well as the extent of the damage. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It is important to note that additional costs may apply if other components of the parking brake system need to be replaced or repaired. It is recommended to consult with a professional mechanic for a more accurate cost estimate based on the specific circumstances of the vehicle in question.

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Code C1821 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1821 Code

1. What are the common symptoms of OBDII code C1821 (Electronic Parking Brake Motor Failure)?

When this code is triggered, you may experience issues with the electronic parking brake not engaging or releasing properly, unusual noises coming from the brake system, or a warning light on the dashboard.

2. What are the possible causes of OBDII code C1821?

The Electronic Parking Brake Motor Failure code C1821 can be caused by a malfunctioning electronic parking brake motor, damaged wiring or connectors in the system, low voltage to the motor, or a faulty electronic control unit (ECU).

3. How can I diagnose the Electronic Parking Brake Motor Failure issue related to code C1821?

To diagnose the issue, you can use an OBDII scanner to retrieve the specific fault code (C1821), inspect the electronic parking brake system components for visible damage, and perform a voltage test on the motor to ensure it is receiving power.

4. Can I continue driving my vehicle with OBDII code C1821 present?

It is not recommended to drive your vehicle with the Electronic Parking Brake Motor Failure code C1821 present, as it may lead to unsafe braking conditions or further damage to the brake system. It is best to address the issue promptly.

5. How can I repair OBDII code C1821 (Electronic Parking Brake Motor Failure)?

Repairing this code may involve replacing the faulty electronic parking brake motor, repairing damaged wiring or connectors, ensuring proper voltage supply to the motor, or reprogramming the electronic control unit (ECU) if necessary.

6. Is it possible to reset OBDII code C1821 without repairing the issue?

While you can clear the fault code temporarily with an OBDII scanner, the underlying issue causing the Electronic Parking Brake Motor Failure should be addressed to prevent further problems and ensure the safety of your vehicle.

7. Are there any DIY tips for troubleshooting OBDII code C1821 at home?

You can start by checking the fuse related to the electronic parking brake system, inspecting the wiring harness for visible damage, and ensuring the parking brake motor connections are secure. However, for a more accurate diagnosis and repair, professional assistance may be needed.

8. How much does it typically cost to repair OBDII code C1821?

The cost of repairing the Electronic Parking Brake Motor Failure code C1821 can vary depending on the extent of the issue, the parts needed for replacement, and the labor rates of the repair shop. It is advisable to get a few quotes from different mechanics to compare prices.

9. Can extreme weather conditions affect the triggering of OBDII code C1821?

Yes, extreme weather conditions such as very high or low temperatures can impact the performance of electronic components in the parking brake system, which may contribute to the triggering of code C1821. It's important to keep the system well-maintained, especially in such conditions.

10. How frequently does OBDII code C1821 (Electronic Parking Brake Motor Failure) occur in vehicles?

The occurrence of code C1821 can vary depending on the make and model of the vehicle, as well as the usage and maintenance of the electronic parking brake system. While not the most common OBDII code, it is encountered by some vehicle owners, particularly those with electronic parking brakes.

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