AutoCodes – Toyota – B279A 2014 Toyota RAV4

B279A 2014 Toyota RAV4 Code - Theft Deterrent System Communication Line High Fixation

Quick Answer

The Diagnostic Trouble Code (DTC) will be set in the Engine Control Module (ECM) when the communication line (IMI - EFIO) between the Engine Control Module and the Certification ECU (Smart Key ECU Assembly) is stuck high. Common causes include Faulty Certification ECU (Smart Key ECU Assembly), Certification ECU harness is open or shorted, Certification ECU 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: B279A 2014 Toyota RAV4 indicates Theft Deterrent System Communication Line High Fixation.
Common causes: Common causes include Faulty Certification ECU (Smart Key ECU Assembly), Certification ECU harness is open or shorted, Certification ECU 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 439

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 Jan 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B279A 2014 Toyota RAV4 Description

OBDII Code B279A 2014 Toyota RAV4 - Theft Deterrent System Communication Line High Fixation - AutoCodes.com — B279A 2014 Toyota RAV4 Code - Theft Deterrent System Communication Line High Fixation

What does this mean?

What are the Possible Causes of the DTC B279A 2014 Toyota RAV4?

Faulty Certification ECU (Smart Key ECU Assembly)
Certification ECU harness is open or shorted
Certification ECU circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC B279A 2014 Toyota RAV4?

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 B279A 2014 Toyota RAV4 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 B279A 2014 Toyota RAV4 code?

Need more information on how to fix the B279A 2014 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B279A 2014 Toyota RAV4 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 B279A 2014 Toyota RAV4 Code

1. What are the common symptoms of OBDII code B279A in a 2014 Toyota RAV4?

- Common symptoms include the vehicle not starting, the security light flashing rapidly, and issues with the theft deterrent system.

2. What does the OBDII code B279A indicate in a 2014 Toyota RAV4?

- OBDII code B279A indicates a problem with the Theft Deterrent System Communication Line High Fixation in the vehicle.

3. What are the possible causes of OBDII code B279A in a 2014 Toyota RAV4?

- Possible causes include a faulty communication line, issues with the theft deterrent system components, or a malfunctioning key or immobilizer.

4. How can I diagnose the cause of OBDII code B279A in my 2014 Toyota RAV4?

- Diagnosing the issue may require testing the communication line, checking the theft deterrent system components, and verifying the functionality of the key and immobilizer.

5. Can I fix OBDII code B279A in my 2014 Toyota RAV4 myself?

- Fixing OBDII code B279A may require advanced diagnostic tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. Is it safe to drive my 2014 Toyota RAV4 with OBDII code B279A active?

- It is not recommended to drive the vehicle with an active B279A code as it may lead to starting issues or potential security system malfunctions.

7. How much does it typically cost to repair OBDII code B279A in a 2014 Toyota RAV4?

- The cost of repair for OBDII code B279A can vary depending on the underlying cause. It is advisable to get a diagnostic assessment from a qualified mechanic for an accurate estimate.

8. Can a dead car battery trigger OBDII code B279A in a 2014 Toyota RAV4?

- A dead car battery can sometimes trigger issues with the theft deterrent system and potentially lead to the activation of OBDII code B279A.

9. Will resetting the ECU clear OBDII code B279A in a 2014 Toyota RAV4?

- Resetting the ECU may temporarily clear the code, but if the underlying issue causing B279A is not addressed, the code is likely to reappear.

10. How long does it take to repair OBDII code B279A in a 2014 Toyota RAV4?

- The repair time for OBDII code B279A can vary depending on the complexity of the issue. It is advisable to consult a professional mechanic for an accurate assessment of the repair timeline.