AutoCodes – Toyota – B279A 2016 Toyota RAV4

B279A 2016 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 2016 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 386

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 2016 Toyota RAV4 Description

OBDII Code B279A 2016 Toyota RAV4 - Theft Deterrent System Communication Line High Fixation - AutoCodes.com — B279A 2016 Toyota RAV4 Code - Theft Deterrent System Communication Line High Fixation

What does this mean?

What are the Possible Causes of the DTC B279A 2016 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 2016 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 2016 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 2016 Toyota RAV4 code?

Need more information on how to fix the B279A 2016 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B279A 2016 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 2016 Toyota RAV4 Code

1. What are the common symptoms of OBDII code B279A in a 2016 Toyota RAV4?

- The common symptoms include issues with starting the vehicle, the security light staying on, and the inability to disarm the theft deterrent system.

2. What can cause the OBDII code B279A to trigger in a 2016 Toyota RAV4?

- The code B279A is often triggered by a communication line high fixation within the theft deterrent system, indicating a potential wiring or connection issue.

3. How can I diagnose the OBDII code B279A in my 2016 Toyota RAV4?

- Diagnosing the B279A code involves checking the wiring and connections related to the theft deterrent system, as well as using a diagnostic scanner to pinpoint the exact issue.

4. Is it safe to continue driving my 2016 Toyota RAV4 with the B279A code present?

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

5. What are some repair tips for fixing the OBDII code B279A in a 2016 Toyota RAV4?

- Repair tips include checking and repairing any damaged wiring, ensuring proper connections, and resetting the theft deterrent system after addressing the issue.

6. Can a DIY enthusiast fix the OBDII code B279A in a 2016 Toyota RAV4?

- While some basic troubleshooting steps can be taken by a DIY enthusiast, resolving the B279A code may require specialized tools and knowledge best handled by a professional mechanic.

7. How much does it typically cost to repair the OBDII code B279A in a 2016 Toyota RAV4?

- The cost of repairing the B279A code can vary depending on the extent of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Will resetting the OBDII code B279A in my 2016 Toyota RAV4 make it go away permanently?

- Simply resetting the code may temporarily clear the fault, but if the underlying issue causing the B279A code is not addressed, it is likely to reappear.

9. Are there any preventive measures to avoid the OBDII code B279A in a 2016 Toyota RAV4?

- Regularly inspecting and maintaining the theft deterrent system components, such as wiring and connections, can help prevent issues that may trigger the B279A code.

10. How long does it usually take to fix the OBDII code B279A in a 2016 Toyota RAV4?

- The repair time for the B279A code can vary depending on the exact cause and complexity of the issue, but it may take a few hours to a full day for a mechanic to diagnose and fix the problem.