B279A 2017 Toyota RAV4 Code - Theft Deterrent System Communication Line High Fixation

Code B279A indicates an issue with the Theft Deterrent System Communication Line, specifically a "High Fixation" error, which means the communication signal is abnormal or out of range.

Symptoms may include the engine failing to start, the security light staying on or flashing, or the vehicle being unable to recognize the key.

This code is often caused by a faulty key, malfunctioning immobilizer system, damaged wiring in the communication circuit, or an issue with the Engine Control Module (ECM).

Yes, a weak or dead key fob battery can disrupt communication between the key and the Theft Deterrent System, potentially triggering this code.

Start by checking the key fob battery and replacing it if necessary. Inspect the wiring and connectors in the immobilizer system for damage or corrosion. If the issue persists, a professional diagnosis may be needed to test the ECM or immobilizer.

No, the B279A code often prevents the engine from starting, so the vehicle will likely be inoperable until the issue is resolved.

Repair costs can vary but typically range from $100 to $500, depending on whether the issue is a simple fix like replacing a key fob battery or a more complex repair involving the immobilizer or ECM.

Basic fixes, like replacing the key fob battery or inspecting wiring, can be done by a DIYer. However, advanced diagnostics and repairs involving the immobilizer or ECM should be handled by a professional.

Not always. While a faulty immobilizer is a common cause, the issue could also stem from wiring problems, a defective key, or ECM malfunctions.

Yes, an automotive locksmith can often diagnose and fix key-related issues, including reprogramming or replacing a faulty key, which may resolve the B279A code.