Code Definition

B1001 — Multiplex integrated control unit internal error

System: Body  |  Type: Manufacturer-Specific  |  Make: Honda

About B1001

B1001 is a manufacturer-specific body diagnostic trouble code recorded for Honda vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1001 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

On Honda vehicles the Multiplex Integrated Control Unit (MICU) is the central body-electrical module — it controls and multiplexes interior and exterior lighting, door locks, power windows, wiper logic, key/immobiliser interface and the F-CAN/B-CAN body network. DTC B1001 is set when the MICU runs its internal self-test and detects an internal hardware or memory fault that prevents it from operating reliably. Triggers include corrupt EEPROM/flash data after a low-voltage event or interrupted reflash, internal microprocessor failure, or marginal power/ground at the unit causing brown-out rese...

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