What causes B1080 on a Honda?

Blown Multiplex Control Unit Module (MICU) Fuse Faulty MICU MICU harness is open or shorted MICU circuit poor electrical connection Loose or corroded power feed at the module

How do I fix B1080 on a Honda?

Confirm the code with a scan tool and check the module fuses first Inspect the power feed and grounds at both modules Test charging voltage and battery condition Repair any loose or corroded power connection Retest after the repair and replace a module only if the fault stays

B1080 The relay control module and MICU saw an out of range power supply input

Q: What does B1080 mean on a Honda?

B1080. The relay control module and MICU saw an out of range power supply input. Body functions that share these modules may stop working. 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 B1080 mean on a Honda?

B1080. The relay control module and MICU saw an out of range power supply input. Body functions that share these modules may stop working. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1080

Blown Multiplex Control Unit Module (MICU) Fuse
Faulty MICU
MICU harness is open or shorted
MICU circuit poor electrical connection
Loose or corroded power feed at the module

How to fix B1080

Confirm the code with a scan tool and check the module fuses first
Inspect the power feed and grounds at both modules
Test charging voltage and battery condition
Repair any loose or corroded power connection
Retest after the repair and replace a module only if the fault stays

Sources and review

Last updated 2026-09-26.