P0B3D [0x0B3D] Check Hybrid System

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Notamechanic44, Aug 3, 2026 at 9:22 PM.

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  1. Notamechanic44

    Notamechanic44 New Member

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    Location:
    Boynton Beach, FL
    Vehicle:
    2012 Prius
    Model:
    Three
    I got 3 codes on my 2012 Prius:
    • P0B3D [0x0B3D] Hybrid battery voltage sensor A - circuit low
    • C1259 [0x5259]
    • C1310 [0x5310]
    The car can drive but it does not engage the electric motor at all. It does not charge the hybrid battery at all either. The car says "Check Hybrid System Stop The Vehicle In A Safe Place". I checked all the battery packs with the obd scanner and they are all reading within the correct range. Checked the auxillary battery and the battery tester said it was good. People are saying that it could be a possible corrosion on the battery control board but not sure how to test for that.
     

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    #1 Notamechanic44, Aug 3, 2026 at 9:22 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    Well you got brake issues in unit 2 nice it tells ya. That 1310 will get ya everytime
     
    #2 Tombukt2, Aug 4, 2026 at 11:00 AM
  3. ChapmanF

    ChapmanF Senior Member

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    C1259 and C1310 from the brake system are both codes that simply mean "yes, the brake system is aware of the hybrid code(s) you have". Doesn't mean anything wrong with the brakes (only they won't do regen, because that requires the hybrid system to be trouble-free).

    A Prius that can't "engage the electric motor at all" is also a Prius that can't start the gasoline engine or move. So in your case, the car definitely can "engage the electric motor", you're just noticing a change in the rules of engagement, because of the known battery problem.

    Those voltage sensor wiring issues can be not too hard to fix. Toyota doesn't sell that sensor wire harness as a separate part for gen 3, but there is a vendor (acenbay?) that has posted around here and sells a version.

    In some cases, the battery smart unit will also need repair or replacement.
     
    #3 ChapmanF, Aug 4, 2026 at 11:31 AM
    Brian1954 likes this.
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