What causes B1280 on a Honda?

Faulty turn signal switch Turn signal switch harness is open or shorted Turn signal switch circuit poor electrical connection Faulty multiplex integrated control unit (MICU) Faulty combination switch control unit

How do I fix B1280 on a Honda?

Confirm the code with a scan tool and check the MICU for related faults Inspect the switch connector for corrosion, moisture, and loose pins Test the switch contacts and the signal at the MICU through each position Check the wiring for an open or short before replacing the switch Replace the turn signal switch if it fails testing, then clear codes and retest

B1280 The MICU saw a fault in the turn signal switch circuit

Q: What does B1280 mean on a Honda?

B1280. The MICU saw a fault in the turn signal switch circuit. The turn signals or hazard function may not work from the lever. 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 B1280 mean on a Honda?

B1280. The MICU saw a fault in the turn signal switch circuit. The turn signals or hazard function may not work from the lever. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1280

Faulty turn signal switch
Turn signal switch harness is open or shorted
Turn signal switch circuit poor electrical connection
Faulty multiplex integrated control unit (MICU)
Faulty combination switch control unit

How to fix B1280

Confirm the code with a scan tool and check the MICU for related faults
Inspect the switch connector for corrosion, moisture, and loose pins
Test the switch contacts and the signal at the MICU through each position
Check the wiring for an open or short before replacing the switch
Replace the turn signal switch if it fails testing, then clear codes and retest

Sources and review

Last updated 2026-09-29.