B279A 2015 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 2015 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.
Code B279A 2015 Toyota RAV4 Description
What are the Possible Causes of the DTC B279A 2015 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 2015 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 2015 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.
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Frequently Asked Questions about B279A 2015 Toyota RAV4 Code
1. What does OBDII code B279A mean in a 2015 Toyota RAV4?
Code B279A indicates an issue with the Theft Deterrent System Communication Line, specifically a high voltage fixation in the communication circuit.
2. What are the common symptoms of code B279A in a 2015 Toyota RAV4?
Symptoms may include the engine failing to start, security or immobilizer warning lights on the dashboard, and difficulty communicating with the immobilizer system.
3. What causes code B279A in a 2015 Toyota RAV4?
Common causes include a damaged or shorted communication wire, a faulty immobilizer ECU, a malfunctioning key transponder, or corroded electrical connectors.
4. Can a dead key fob battery cause code B279A in a 2015 Toyota RAV4?
While a dead key fob battery can prevent the car from starting, it is unlikely to trigger code B279A since the code relates to the communication line itself.
5. How can I diagnose the cause of code B279A in my 2015 Toyota RAV4?
Start by inspecting the immobilizer wiring harness and connectors for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the communication circuit.
6. Can I continue driving my 2015 Toyota RAV4 with code B279A?
No, code B279A typically prevents the engine from starting, so the vehicle may not be drivable until the issue is resolved.
7. How do you fix code B279A in a 2015 Toyota RAV4?
Repairs may include repairing or replacing damaged wiring, cleaning corroded connectors, reprogramming the immobilizer system, or replacing the immobilizer ECU if necessary.
8. Does clearing the code B279A resolve the issue in a 2015 Toyota RAV4?
Clearing the code may temporarily remove it, but the underlying issue must be addressed to prevent the code from returning.
9. How much does it cost to fix code B279A in a 2015 Toyota RAV4?
Repair costs vary depending on the root cause but may range from $100 for simple wiring repairs to $600 or more if the immobilizer ECU needs replacement.
10. Can an aftermarket alarm system cause code B279A in a 2015 Toyota RAV4?
Yes, improperly installed aftermarket alarm systems can interfere with the theft deterrent system and trigger code B279A.
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