AutoCodes – GMC – C0204 GMC

C0204 GMC Code - Master Cylinder Pressure Sensor

Quick Answer

The Electronic Brake Control Module (EBCM) uses the input from the master cylinder pressure sensor for more accurate braking control during a vehicle stability enhancement system (VSES) event. Common causes include Faulty Master Cylinder Pressure Sensor, Master Cylinder Pressure Sensor harness is open or shorted, Master Cylinder Pressure Sensor circuit poor electrical connection. 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: C0204 GMC indicates Master Cylinder Pressure Sensor.
Common causes: Common causes include Faulty Master Cylinder Pressure Sensor, Master Cylinder Pressure Sensor harness is open or shorted, Master Cylinder Pressure Sensor circuit poor electrical connection.
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.

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Code Popularity 1,460

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0204 GMC Description

OBDII Code C0204 GMC - Master Cylinder Pressure Sensor - AutoCodes.com — C0204 GMC Code - Master Cylinder Pressure Sensor

What does this mean?

What are the Possible Causes of the DTC C0204 GMC?

Faulty Master Cylinder Pressure Sensor
Master Cylinder Pressure Sensor harness is open or shorted
Master Cylinder Pressure Sensor circuit poor electrical connection

How to Fix the DTC C0204 GMC?

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 C0204 GMC 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 C0204 GMC code?

Need more information on how to fix the C0204 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 C0204 GMC Code

1. What are the common symptoms of a C0204 OBDII code in a GMC related to the Master Cylinder Pressure Sensor?

- Common symptoms include the illumination of the check engine light, issues with the vehicle's brake system, and potential loss of braking power.

2. What could cause the C0204 OBDII code to appear in a GMC's diagnostic system?

- The most common causes of the C0204 code are a faulty master cylinder pressure sensor, damaged wiring or connectors in the sensor circuit, or a malfunction in the brake system.

3. How can I diagnose the root cause of the C0204 code related to the Master Cylinder Pressure Sensor in my GMC?

- To diagnose the issue, it is recommended to use a diagnostic scanner to retrieve the specific details of the code, inspect the master cylinder pressure sensor and its circuitry for any visible damage, and perform a thorough brake system inspection.

4. What are some repair tips for addressing the C0204 OBDII code in a GMC?

- Repair tips include checking and replacing the master cylinder pressure sensor if it is faulty, repairing any damaged wiring or connectors in the sensor circuit, and ensuring the proper functioning of the brake system components.

5. Can I continue driving my GMC with a C0204 OBDII code related to the Master Cylinder Pressure Sensor?

- It is not recommended to drive the vehicle with the C0204 code present, as it can affect the performance of the brake system and compromise safety. It is best to address the issue promptly.

6. Are there any safety concerns associated with the C0204 OBDII code in a GMC?

- Yes, safety concerns may arise due to potential issues with the brake system caused by the C0204 code. It is important to address the problem to ensure the safe operation of the vehicle.

7. How much does it typically cost to repair the C0204 OBDII code related to the Master Cylinder Pressure Sensor in a GMC?

- The cost of repair can vary depending on the specific cause of the code and the extent of the repairs needed. It is advisable to consult a mechanic for an accurate diagnosis and cost estimate.

8. Can I reset the C0204 OBDII code in my GMC without addressing the underlying issue?

- While you can clear the code using a diagnostic scanner, it is important to address the root cause of the C0204 code to prevent further issues with the brake system and ensure the safety of the vehicle.

9. Will the C0204 OBDII code in a GMC cause any long-term damage if left unaddressed?

- If left unaddressed, the C0204 code can potentially lead to further damage to the brake system, affect the vehicle's performance, and compromise safety. It is important to resolve the issue promptly.

10. How long does it typically take to repair the C0204 OBDII code related to the Master Cylinder Pressure Sensor in a GMC?

- The repair time can vary depending on the specific cause of the code and the complexity of the repairs needed. It is advisable to consult a mechanic for a more accurate estimate of the repair timeframe.