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Engine-Codes – Generic – C279A

C279A Code - Invalid Brake Pressure Transducer Pressure Input Received

Quick Answer

The C279A diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has detected an issue with the brake pressure transducer pressure input. Common causes include Faulty brake pressure transducer, Damaged or corroded wiring connections to the brake pressure transducer, Low brake fluid level or contaminated brake fluid. 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
C279A indicates Invalid Brake Pressure Transducer Pressure Input Received.
Common causes
Common causes include Faulty brake pressure transducer, Damaged or corroded wiring connections to the brake pressure transducer, Low brake fluid level or contaminated brake fluid.
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 C279A Description

The C279A diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has detected an issue with the brake pressure transducer pressure input. The brake pressure transducer is responsible for monitoring and relaying information about the brake fluid pressure within the braking system. When an invalid pressure input is received, it typically means that the transducer is not functioning correctly or that there is a problem with the signal being sent to the vehicle's computer.

OBDII Code C279A - Invalid Brake Pressure Transducer Pressure Input Received
C279A Code - Invalid Brake Pressure Transducer Pressure Input Received

Common Causes of C279A

  1. Faulty brake pressure transducer
  2. Damaged or corroded wiring connections to the brake pressure transducer
  3. Low brake fluid level or contaminated brake fluid
  4. Faulty ABS control module
  5. Electrical issues within the ABS system

Symptoms of C279A

  1. Illumination of the ABS or traction control warning light on the dashboard
  2. Increased stopping distance or reduced braking effectiveness
  3. Inconsistent brake pedal feel, such as a spongy or hard pedal
  4. Erratic or noisy operation of the ABS system during braking
  5. Decreased overall vehicle stability during braking maneuvers

How to Fix C279A

  1. Begin by conducting a visual inspection of the brake pressure transducer and its wiring connections to check for any signs of damage or corrosion. Replace any damaged components as needed.
  2. Use a diagnostic scan tool to read and clear the DTC from the vehicle's computer memory. This will reset the system and allow for a fresh start to monitor the brake pressure transducer's readings.
  3. Test the brake pressure transducer using a multimeter to ensure it is providing accurate pressure readings. Replace the transducer if it is found to be faulty.
  4. Check and top off the brake fluid level if necessary. Perform a brake fluid flush if the fluid is contaminated or discolored.
  5. If the issue persists after these steps, consult a professional mechanic or dealership for further diagnosis and potential replacement of the ABS control module.

Cost to Fix C279A

The cost of repairing an invalid brake pressure transducer pressure input can vary depending on the extent of the issue and the specific repairs needed. In general, the cost of replacing a faulty brake pressure transducer can range from $150 to $300, including parts and labor. Additional costs may apply if other components of the braking system need attention or if the ABS control module requires replacement.

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Code C279A Information for Specific Makes

  • C279A Ford — Invalid Brake Pressure Transducer Pressure Input Received
  • C279A Lincoln — Invalid Brake Pressure Transducer Pressure Input Received
  • C279A Mercury — Invalid Brake Pressure Transducer Pressure Input Received
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 C279A Code

1. What are the common symptoms of OBDII code C279A - Invalid Brake Pressure Transducer Pressure Input Received?

The common symptoms include the ABS warning light illuminating on the dashboard, loss of ABS functionality, and potential issues with the brake system's performance.

2. What are the possible causes of OBDII code C279A?

Possible causes of this code include a faulty brake pressure transducer, damaged wiring or connectors in the brake pressure transducer circuit, or issues with the ABS control module.

3. How can I diagnose the source of OBDII code C279A?

Diagnosing the issue typically involves inspecting the brake pressure transducer and its wiring for any signs of damage, checking the connectors for proper connection, and using a scan tool to read live data from the ABS system.

4. Can I continue driving my vehicle with OBDII code C279A?

It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of the ABS system, potentially compromising the vehicle's safety.

5. How can I repair OBDII code C279A?

Repairing this code may involve replacing the faulty brake pressure transducer, repairing any damaged wiring or connectors, or recalibrating the ABS system using a diagnostic tool.

6. Is it possible to reset OBDII code C279A without fixing the underlying issue?

While clearing the code may temporarily turn off the warning light, it is crucial to address the root cause of the problem to prevent it from reoccurring and ensure the proper functioning of the ABS system.

7. Are there any DIY tips for fixing OBDII code C279A?

DIY tips may include visually inspecting the brake pressure transducer and its connections, checking for any visible damage, and ensuring proper seating of the connectors before seeking professional assistance if needed.

8. How much does it typically cost to fix OBDII code C279A?

The cost of fixing this code can vary depending on the specific cause of the issue, the extent of repairs needed, and labor rates in your area. It is recommended to consult a mechanic for a more accurate estimate.

9. Can OBDII code C279A be related to other brake system issues?

While this code specifically points to an issue with the brake pressure transducer, it is possible for related problems to affect the overall performance of the brake system. Regular maintenance and inspections are recommended to ensure optimal brake performance.

10. Will OBDII code C279A cause my vehicle to fail an emissions test?

This code is related to the ABS system and is unlikely to cause your vehicle to fail an emissions test. However, it is still important to address the issue for safety and performance reasons.

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