What causes B2794 on a Toyota?

Key not registered to the vehicle Faulty key transponder chip Faulty certification ECU Corroded engine switch connector Interrupted key registration

How do I fix B2794 on a Toyota?

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

B2794 Unmatched encryption code in the immobilizer system

Q: What does B2794 mean on a Toyota?

B2794. Unmatched encryption code in the immobilizer system. The key chip and the certification ECU do not share a valid code. Applies to Toyota, Lexus and Scion models that use this code.

Category: Body
Severity: Body Warning Light
Applies to: Toyota, Lexus and Scion models that use this code

What does B2794 mean on a Toyota?

B2794. Unmatched encryption code in the immobilizer system. The key chip and the certification ECU do not share a valid code. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.

Common causes of B2794

Key not registered to the vehicle
Faulty key transponder chip
Faulty certification ECU
Corroded engine switch connector
Interrupted key registration

How to fix B2794

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