Engine-Codes - Generic - B1100

B1100 - Door Multiplex Control Unit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B1100 Possible Causes

  • Faulty Door Multiplex Control Unit
  • Door Multiplex Control Unit harness is open or shorted
  • Door Multiplex Control Unit circuit poor electrical connection

How do I fix code B1100?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the B1100 code

Labor: 1.0

The cost of diagnosing the B1100 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B1100 Meaning

The Multiplex Control Unit Module (MICU) monitors the Door Multiplex Control Unit. The MICU sets the OBDII code when the Door Multiplex Control Unit is not to factory specifications.

B1100 More Information

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Information for specific makes

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