AutoCodes – Dodge – C0021 Dodge

C0021 Dodge Code - Brake Booster Performance

Quick Answer

When the Vacuum Pressure Sensor indicates a failure in the Vacuum Booster. Common causes include Faulty Brake Booster, Faulty Vacuum Pressure Sensor, Vacuum Pressure Sensor harness is open or shorted. 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: C0021 Dodge indicates Brake Booster Performance.
Common causes: Common causes include Faulty Brake Booster, Faulty Vacuum Pressure Sensor, Vacuum Pressure Sensor harness is open or shorted.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 8,829

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C0021 Dodge Description

When the Vacuum Pressure Sensor indicates a failure in the Vacuum Booster. After the cold start phase (i.e. 3 min after engine is running) and if the engine is running above 600 RPM there should be at least -200 mbar (-2.90 psi) of differential pressure in the vacuum-chamber for boosting the pedal force. If the pressure remains below this value for more than two minutes. Timer resets if the pressure remains above 220 mbar (3.19 psi) for 10 seconds.

OBDII Code C0021 Dodge - Brake Booster Performance - AutoCodes.com — C0021 Dodge Code - Brake Booster Performance

What does this mean?

What are the Possible Causes of the DTC C0021 Dodge?

Faulty Brake Booster
Faulty Vacuum Pressure Sensor
Vacuum Pressure Sensor harness is open or shorted
Vacuum Pressure Sensor circuit poor electrical connection

How to Fix the DTC C0021 Dodge?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0021 Dodge code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C0021 Dodge code?

Need more information on how to fix the C0021 Dodge code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0021 Dodge code diagnosed by a professional: Find a repair shop in your area

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 C0021 Dodge Code

1. What are the common symptoms of OBDII code C0021 related to Brake Booster Performance in a Dodge vehicle?

- Common symptoms include a firm brake pedal, difficulty in applying brakes, and the illumination of the ABS warning light on the dashboard.

2. What are the potential causes of OBDII code C0021 in a Dodge, indicating an issue with Brake Booster Performance?

- The code C0021 can be triggered by a faulty brake booster, a vacuum leak in the brake booster system, or issues with the brake booster sensor.

3. How can I diagnose the OBDII code C0021 in my Dodge if I suspect a problem with the Brake Booster Performance?

- A diagnostic scan tool can help retrieve the specific error code and provide insight into the underlying issue with the brake booster system.

4. Are there any DIY repair tips for addressing OBDII code C0021 indicating Brake Booster Performance problems in a Dodge?

- DIY repair tips may include checking and replacing the brake booster sensor, inspecting for vacuum leaks, and ensuring proper vacuum hose connections.

5. Is it safe to continue driving my Dodge with OBDII code C0021 related to Brake Booster Performance?

- It is not recommended to drive the vehicle with code C0021, as it can affect braking performance and compromise overall safety. Immediate attention and repair are advised.

6. Can resetting the OBDII system clear the C0021 code related to Brake Booster Performance in a Dodge?

- While clearing the code may temporarily turn off the warning light, it is crucial to address the root cause of the issue to prevent future brake system complications.

7. How much does it typically cost to repair OBDII code C0021 in a Dodge due to Brake Booster Performance issues?

- The cost of repair can vary depending on the exact cause of the problem, but it may involve expenses for parts replacement, labor, and diagnostic services.

8. Will OBDII code C0021 related to Brake Booster Performance affect the overall performance of my Dodge vehicle?

- Yes, code C0021 can impact the braking system's performance, potentially leading to decreased braking efficiency and safety risks while driving.

9. Are there any preventive measures I can take to avoid OBDII code C0021 indicating Brake Booster Performance problems in my Dodge?

- Regular maintenance of the brake system, including inspections for leaks and proper functioning of the brake booster, can help prevent issues leading to code C0021.

10. How long does it usually take to repair OBDII code C0021 associated with Brake Booster Performance in a Dodge?

- The repair time can vary based on the specific cause of the problem, but it may take a few hours to a day for diagnosis and repair by a qualified mechanic.