What causes B1234 on a Honda?

Driver side air mix control motor shorted internally Motor circuit shorted to ground or power Corroded pins at the driver side motor connector Climate control unit driver at fault Seized air door overloading the motor

How do I fix B1234 on a Honda?

Scan the climate control for stored motor codes Command the driver air mix motor and watch position feedback Measure the motor circuit for a short Free a binding air door before replacing the motor Replace the driver side air mix control motor if it tests shorted Clear the code and retest

B1234 The climate control unit saw a short in the driver side air mix control motor circuit

Q: What does B1234 mean on a Honda?

B1234. The climate control unit saw a short in the driver side air mix control motor circuit. The driver side may blow only hot or only cold air. Applies to Honda and Acura models that use this code.

Category: Body
Severity: Body Warning Light
Applies to: Honda and Acura models that use this code

What does B1234 mean on a Honda?

B1234. The climate control unit saw a short in the driver side air mix control motor circuit. The driver side may blow only hot or only cold air. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1234

Driver side air mix control motor shorted internally
Motor circuit shorted to ground or power
Corroded pins at the driver side motor connector
Climate control unit driver at fault
Seized air door overloading the motor

How to fix B1234

Scan the climate control for stored motor codes
Command the driver air mix motor and watch position feedback
Measure the motor circuit for a short
Free a binding air door before replacing the motor
Replace the driver side air mix control motor if it tests shorted
Clear the code and retest

Sources and review

Last updated 2026-10-10.