What causes B1207 on a Toyota?

Open or short in the communication circuit between the certification ECU and the gateway ECU Loose or corroded connector at the certification ECU Damaged harness on the communication circuit between the certification ECU and the gateway ECU Failed certification ECU Low system voltage

How do I fix B1207 on a Toyota?

Confirm the code and read freeze frame data Check battery voltage and the charging system Inspect and reseat the certification ECU connector Test the communication circuit between the certification ECU and the gateway ECU for opens and shorts Replace the certification ECU only after the circuit tests fail

B1207 Multiplex communication fault. The certification ECU and the gateway ECU stop talking

Q: What does B1207 mean on a Toyota?

B1207. Multiplex communication fault. The certification ECU and the gateway ECU stop talking. 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 B1207 mean on a Toyota?

B1207. Multiplex communication fault. The certification ECU and the gateway ECU stop talking. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.

Common causes of B1207

Open or short in the communication circuit between the certification ECU and the gateway ECU
Loose or corroded connector at the certification ECU
Damaged harness on the communication circuit between the certification ECU and the gateway ECU
Failed certification ECU
Low system voltage

How to fix B1207

Confirm the code and read freeze frame data
Check battery voltage and the charging system
Inspect and reseat the certification ECU connector
Test the communication circuit between the certification ECU and the gateway ECU for opens and shorts
Replace the certification ECU only after the circuit tests fail