C0204 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 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.
Code C0204 Description
What are the Possible Causes of the DTC C0204?
- 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?
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 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 code?
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Need Help with the Code?
Get the C0204 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C0204 Buick — Master Cylinder Pressure Sensor
- C0204 Cadillac — Master Cylinder Pressure Sensor
- C0204 Chevrolet — Master Cylinder Pressure Sensor
- C0204 GMC — Master Cylinder Pressure Sensor
- C0204 Pontiac — Master Cylinder Pressure Sensor
- C0204 Saturn — Master Cylinder Pressure Sensor
Frequently Asked Questions about C0204 Code
What does the OBDII code C0204 mean?
C0204 indicates an issue with the Master Cylinder Pressure Sensor, which monitors brake pressure and communicates data to the vehicle's braking system.
What are the common symptoms of the C0204 code?
Symptoms include the ABS warning light turning on, poor braking performance, and potentially a spongy brake pedal feel.
What causes the C0204 code to appear?
Common causes include a faulty master cylinder pressure sensor, damaged wiring or connectors, or issues with the ABS control module.
Can I still drive with the C0204 code?
It may be possible to drive, but it is not recommended as braking performance could be compromised, increasing the risk of an accident.
How is the C0204 code diagnosed?
A technician uses a scan tool to verify the code, inspects the sensor and wiring for damage, and may test the ABS control module for faults.
How can I fix the C0204 code?
Repairs may include replacing the master cylinder pressure sensor, repairing damaged wires or connectors, or reprogramming or replacing the ABS control module.
How much does it cost to repair a C0204 code?
Repair costs vary, but replacing the master cylinder pressure sensor typically ranges from $150 to $300, including parts and labor.
Can a weak battery trigger the C0204 code?
While unlikely, a weak battery can cause electrical issues that may contribute to errors in the braking system, including this code.
Is the C0204 code related to the ABS system?
Yes, the C0204 code is directly tied to the ABS system, as the master cylinder pressure sensor plays a key role in its operation.
Do I need to recalibrate the ABS system after fixing the C0204 code?
In some cases, recalibration or resetting the ABS system may be necessary after repairs to ensure proper operation.
Discuss the causes and fixes for C0204 OBDII Code
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