What causes B1225 on a Honda?

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

How do I fix B1225 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 in-car temperature sensor if it fails testing Clear the code and retest

B1225 The climate control unit saw an open in the in-car temperature sensor circuit

Q: What does B1225 mean on a Honda?

B1225. The climate control unit saw an open in the in-car temperature sensor circuit. Automatic temperature control may misread the cabin and blow the wrong 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 B1225 mean on a Honda?

B1225. The climate control unit saw an open in the in-car temperature sensor circuit. Automatic temperature control may misread the cabin and blow the wrong air. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1225

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

How to fix B1225

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 in-car temperature sensor if it fails testing
Clear the code and retest

Sources and review

Last updated 2026-10-10.