What causes B2791 on a Toyota?

Faulty key unlock warning switch Open or short in the switch circuit Corroded switch connector Failed certification ECU Damaged harness at the column

How do I fix B2791 on a Toyota?

Confirm the code with a scan tool Inspect and reseat the switch connector Test the switch and its circuit Check the certification ECU Replace the switch only after tests fail

B2791 Key unlock warning switch malfunction in the immobilizer system

Q: What does B2791 mean on a Toyota?

B2791. Key unlock warning switch malfunction in the immobilizer system. The system cannot confirm the key is inserted and the engine may not start. 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 B2791 mean on a Toyota?

B2791. Key unlock warning switch malfunction in the immobilizer system. The system cannot confirm the key is inserted and the engine may not start. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.

Common causes of B2791

Faulty key unlock warning switch
Open or short in the switch circuit
Corroded switch connector
Failed certification ECU
Damaged harness at the column

How to fix B2791

Confirm the code with a scan tool
Inspect and reseat the switch connector
Test the switch and its circuit
Check the certification ECU
Replace the switch only after tests fail