What causes B1227 on a Honda?

Faulty outside air temperature sensor Open in the outside air temperature sensor circuit Poor electrical connection at the outside sensor connector Faulty climate control unit Corroded or loose connector pins at the sensor

How do I fix B1227 on a Honda?

Confirm the code and check the climate control for related faults Inspect the sensor connector for corrosion, moisture, and loose pins Test the sensor signal and reference voltage at the connector Check the wiring for an open before replacing the sensor Replace the outside air temperature sensor if it fails testing Clear the code and retest

B1227 The climate control unit saw an open in the outside air temperature sensor circuit

Q: What does B1227 mean on a Honda?

B1227. The climate control unit saw an open in the outside air temperature sensor circuit. The outside temperature display may read wrong and auto climate may miscalculate. 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 B1227 mean on a Honda?

B1227. The climate control unit saw an open in the outside air temperature sensor circuit. The outside temperature display may read wrong and auto climate may miscalculate. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1227

Faulty outside air temperature sensor
Open in the outside air temperature sensor circuit
Poor electrical connection at the outside sensor connector
Faulty climate control unit
Corroded or loose connector pins at the sensor

How to fix B1227

Confirm the code and check the climate control for related faults
Inspect the sensor connector for corrosion, moisture, and loose pins
Test the sensor signal and reference voltage at the connector
Check the wiring for an open before replacing the sensor
Replace the outside air temperature sensor if it fails testing
Clear the code and retest

Sources and review

Last updated 2026-10-10.