B279C Scion Code - Theft Deterrent System Presence Detection
Quick Answer
This Diagnostic Trouble Code (DTC) is stored when an Engine Control Module (ECM) that is incompatible with the immobiliser system is installed in the vehicle. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module 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
- B279C Scion indicates Theft Deterrent System Presence Detection.
- Common causes
- Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module 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 B279C Scion Description
What are the Possible Causes of the DTC B279C Scion?
- Faulty Engine Control Module (ECM)
- Engine Control Module harness is open or shorted
- Engine Control Module circuit poor electrical connection
How to Fix the DTC B279C Scion?
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 B279C Scion 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 B279C Scion Code
1. What does the OBDII code B279C mean on a Scion?
The B279C code indicates an issue with the Theft Deterrent System Presence Detection, which is responsible for verifying the presence of the vehicle's anti-theft system.
2. What are common symptoms of the B279C code in a Scion?
Common symptoms include the engine not starting, security indicator light staying on or flashing, or intermittent starting issues.
3. What causes the B279C code to appear in a Scion?
Possible causes include a faulty theft deterrent system ECU, a malfunctioning immobilizer key, damaged wiring or connectors, or communication issues between the key and ECU.
4. How do I diagnose the B279C code on my Scion?
Diagnosis involves checking for trouble codes in the theft deterrent system, inspecting the key and immobilizer, and testing wiring and connections between the ECU and theft system components.
5. Can the B279C code prevent my Scion from starting?
Yes, this code can prevent the engine from starting if the theft deterrent system fails to detect or validate the key properly.
6. Is the B279C code specific to Scion vehicles?
While B279C is common in Toyota and Scion vehicles, it may also appear in other vehicles using similar anti-theft systems.
7. Can I fix the B279C code myself?
If the issue is due to a key or battery problem, you may be able to fix it yourself. For more complex issues, such as ECU or wiring faults, professional diagnosis and repair are recommended.
8. How much does it cost to repair the B279C code on a Scion?
Repair costs vary depending on the issue. Replacing a key or reprogramming it typically costs $100–$300, while ECU or wiring repairs can be more expensive.
9. Can a low battery trigger the B279C code in my Scion?
Yes, a low or failing battery can disrupt the communication between the key and the theft deterrent system, potentially triggering this code.
10. How can I prevent the B279C code from recurring?
Ensure your key and immobilizer are in good condition, maintain proper battery voltage, and address any wiring or connector issues promptly.
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