What causes B1226 on a Honda?

In-car temperature sensor shorted internally Signal wire pinched or shorted to ground Corroded pins at the in-car sensor connector Climate control unit input stage at fault Moisture tracking across the sensor connector

How do I fix B1226 on a Honda?

Scan the climate control for stored sensor codes Disconnect the sensor and watch the code change Measure the sensor circuit for a short to ground or power Repair the pinched or shorted wiring found Replace the in-car temperature sensor if it tests shorted Clear the code and retest

B1226 The climate control unit saw a short in the in-car temperature sensor circuit

Q: What does B1226 mean on a Honda?

B1226. The climate control unit saw a short 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 B1226 mean on a Honda?

B1226. The climate control unit saw a short 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 B1226

In-car temperature sensor shorted internally
Signal wire pinched or shorted to ground
Corroded pins at the in-car sensor connector
Climate control unit input stage at fault
Moisture tracking across the sensor connector

How to fix B1226

Scan the climate control for stored sensor codes
Disconnect the sensor and watch the code change
Measure the sensor circuit for a short to ground or power
Repair the pinched or shorted wiring found
Replace the in-car temperature sensor if it tests shorted
Clear the code and retest

Sources and review

Last updated 2026-10-10.