What causes B1237 on a Honda?

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

How do I fix B1237 on a Honda?

Scan the climate control for stored motor codes Command the passenger 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 passenger side air mix control motor if it tests shorted Clear the code and retest

B1237 The climate control unit saw a short in the passenger side air mix control motor circuit

Q: What does B1237 mean on a Honda?

B1237. The climate control unit saw a short in the passenger side air mix control motor circuit. The passenger 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 B1237 mean on a Honda?

B1237. The climate control unit saw a short in the passenger side air mix control motor circuit. The passenger 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 B1237

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

How to fix B1237

Scan the climate control for stored motor codes
Command the passenger 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 passenger side air mix control motor if it tests shorted
Clear the code and retest

Sources and review

Last updated 2026-10-10.