Honda B121B: Short in the Mode Control Motor Circuit

Is your scanner showing Honda B121B?
No worries. We'll show you what it means and how to deal with it.

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Honda B121B: Short in the Mode Control Motor Circuit

DIY Difficulty Level
Repair Cost
Can I Still Drive?
Yes (Short-term only)

What Does The Honda B121B Code Mean?

A malfunction in the mode control motor was detected.

NOTE: Perform the self-diagnostic function with the HDS or climate control unit.

What Are The Potential Causes Of The Honda B121B Code?

  • Loose wires or poor connections on the mode control motor circuit
  • “Short” to body ground
  • “Short” to power
  • Faulty mode control motor
  • Faulty climate control unit and

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> CrocSee 250 Pieces - Car Fuses Assortment Kit
>>> 06-11 Civic Heater Air Blend Door Actuator
>>> Dorman Remanufactured Climate Control Module

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources


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