B2799 Engine immobilizer malfunction
What does B2799 mean on a Toyota?
B2799. Engine immobilizer malfunction. The certification ECU finds a fault in the immobilizer system and the engine may not start. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.
Common causes of B2799
- Faulty key or transponder chip
- Faulty transponder key amplifier
- Faulty certification ECU
- Corroded engine switch connector
- Faulty engine control module
How to fix B2799
- Confirm the code with a scan tool
- Try a known good registered key
- Re-register the key to the vehicle
- Inspect and reseat the engine switch connector
- Replace the ECU only after tests fail