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Engine-Codes – Generic – B279C

B279C Code - Theft Deterrent System Presence Detection

Quick Answer

The B279C diagnostic trouble code (DTC) refers to an issue with the theft deterrent system presence detection in a vehicle. Common causes include Faulty key fob, Malfunctioning immobilizer, Wiring issues. 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
B279C indicates Theft Deterrent System Presence Detection.
Common causes
Common causes include Faulty key fob, Malfunctioning immobilizer, Wiring issues.
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 16, 2024
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Code B279C Description

The B279C diagnostic trouble code (DTC) refers to an issue with the theft deterrent system presence detection in a vehicle. This code indicates that there is a problem with the system that is designed to prevent unauthorized access to the vehicle. The theft deterrent system is an important security feature that helps protect the vehicle from theft.

OBDII Code B279C - Theft Deterrent System Presence Detection
B279C Code - Theft Deterrent System Presence Detection

Common Causes of B279C

  1. Faulty key fob
  2. Malfunctioning immobilizer
  3. Wiring issues
  4. Faulty control module

Symptoms of B279C

  1. Vehicle not starting
  2. Security light flashing on the dashboard
  3. Inability to disarm the alarm system
  4. Key fob not being recognized by the system

How to Fix B279C

  1. Check the key fob battery: Replace the battery in the key fob to ensure it is sending a signal to the vehicle.
  2. Check the immobilizer: Inspect the immobilizer system for any faults or malfunctions and repair or replace as necessary.
  3. Check wiring: Inspect the wiring harness for any damage or loose connections that may be causing the issue.
  4. Check control module: Test the control module for proper functioning and replace if necessary.
  5. Clear the code: Once the issue has been resolved, clear the DTC from the vehicle's computer to reset the system.

Cost to Fix B279C

The cost of repairing a theft deterrent system presence detection issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $100 to $300. Overall, the total cost of repairing this issue could be anywhere from $200 to $800. It's important to keep in mind that these are rough estimates and actual costs may vary based on factors such as the vehicle make and model, location, and the specific repair shop. It's recommended to get a detailed quote from a qualified mechanic to get a more accurate cost estimate.

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Code B279C 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 B279C Code

1. What does the OBDII code B279C mean?

The B279C code indicates an issue with the Theft Deterrent System Presence Detection, which involves a malfunction in the system that verifies the presence of the theft deterrent module.

2. What are the common symptoms of the B279C code?

Symptoms may include the inability to start the vehicle, the security or immobilizer warning light illuminating, and potential error messages on the dashboard.

3. What causes the B279C code to appear?

The most common causes are a faulty theft deterrent module, wiring or connector issues, or an incorrect configuration of the theft deterrent system.

4. Can a dead battery trigger the B279C code?

Yes, a dead or weak battery can sometimes cause the theft deterrent system to malfunction and trigger the B279C code.

5. How is the B279C code diagnosed?

A technician will use a scan tool to read the code, inspect the theft deterrent module and its wiring, and verify the system's configuration to pinpoint the issue.

6. Can I drive my car with the B279C code active?

In most cases, a vehicle with this code will not start due to the security system being engaged, so driving may not be possible.

7. How do you fix the B279C code?

Repairs may include replacing the theft deterrent module, repairing damaged wiring or connectors, or reprogramming the system to ensure proper configuration.

8. Does the B279C code mean my car was tampered with?

Not necessarily. While tampering could trigger this code, it is often caused by internal system malfunctions or electrical issues.

9. Will clearing the B279C code solve the problem?

Clearing the code without addressing the root cause will not permanently fix the issue, and the code will likely return.

10. How much does it cost to repair the B279C code?

The cost depends on the specific cause, but repairs can range from $100 for minor wiring fixes to $500 or more if the theft deterrent module needs replacement.

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