Prius 2012 got code for all the 4 ignition coils Code P0351,2,3,4

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by Tarek, Apr 24, 2025.

  1. Tarek

    Tarek Junior Member

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    Hello everyone,

    I recently replaced the engine in my 2012 Prius V, and the car has been running well—except for both O2 sensors (P0032, P0037), which have been throwing codes for the last 3-4 weeks.

    However, after a severe thunderstorm with lightning (right over my house!), I took a 60-mile trip. The car ran fine at first, but on the second trip, it started jerking hard (like a misfire).

    I checked the codes and found:

    • O2 Sensor Codes:
      • P0032 (Bank 1 Sensor 1 - Heater Circuit High)

      • P0037 (Bank 1 Sensor 2 - Heater Circuit Low)
    • Ignition Coil Codes (All 4 Cylinders):
      • P0351 (Ignition Coil A Primary/Secondary Circuit)

      • P0352 (Ignition Coil B Primary/Secondary Circuit)

      • P0353 (Ignition Coil C Primary/Secondary Circuit)

      • P0354 (Ignition Coil D Primary/Secondary Circuit)
    Strange Observations:

    • I already replaced 4 coils with brand-new ones + tested another set (total of 12 coils).

    • All coils behave the same, so it’s unlikely they’re all bad.
    Possible Causes?

    1. Electrical Surge Damage – Could the lightning storm have fried the ECU, wiring, or sensors?

    2. Grounding Issue – Bad engine/chassis grounds after the swap?

    3. Faulty ECU or Power Supply – Voltage spikes affecting the ignition system?
    Has anyone experienced this after an engine swap or electrical storm? Any advice on where to check next?

    Thanks in advance!
     

    Attached Files:

    #1 Tarek, Apr 24, 2025
  2. rjparker

    rjparker Tu Humilde Sirviente

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    Where did the replacement engine come from?

    It's hard to imagine a nearby lightning strike causing anything in a car that is not on the grid. A direct hit would have killed it instantly and would probably show physical damage.

    Something related to the swap is a possibility. As you suggested, a bad ground attachment or bad connection that worked loose.
     
    #2 rjparker, Apr 24, 2025
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  3. MAX2

    MAX2 Senior Member

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    Failure of all four at once is unlikely. It is necessary to check the common between them (power supply, grounding, signal transmission to the ECM).
     
    #3 MAX2, Apr 25, 2025
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  4. ChapmanF

    ChapmanF Senior Member

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    The P035x codes are all based on a single shared "IGF" ignition-feedback circuit that all four coils connect to and goes to a single input pin of the ECM. Each coil sends an IGF pulse to confirm that it has fired when the ECM told it to. A single IGF circuit is enough because the ECM never tells more than one coil to fire at a time, so the ECM knows which coil sent (or didn't send) the corresponding IGF pulse.

    When all of P035[1-4] show up together, it suggests a problem with the common section of that IGF wiring or with the ECM input it connects to.

    Lightning is a very large electric current, which is (Ørsted's law) always surrounded by a large magnetic field. It's also very quick, meaning a very rapid change of magnetic field, and a changing magnetic field is always (Faraday's law) accompanied by voltages induced in nearby stuff. A magnetic field as large and changing as fast as in a lightning strike induces big voltages in nearby stuff. No direct hit is required.
     
    #4 ChapmanF, Apr 25, 2025
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  5. Tarek

    Tarek Junior Member

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    Hello everyone thanks for the help, my internet is out and still comes nad go.

     
    #5 Tarek, Apr 25, 2025
  6. BiomedO1

    BiomedO1 Senior Member

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    You should probably replace your O2 sensors, because it's part of your fuel mixture control loop. It could choke out your engine if it's too lean.
    Also check the ground wire from chassis ground to the engine block itself. If there's an intermittent path the spark plugs won't be able to fire.

    Hope this helps.....
     
    #6 BiomedO1, Apr 25, 2025
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  7. rjparker

    rjparker Tu Humilde Sirviente

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    You may well have another set of codes that requires a drive cycle to kill the engine.

    The unresolved high voltage leaks after the JDM swap is a concern.

    The ecm seems unlikely. I will send you a contact in San Antonio for a low cost diagnosis.
     
    #7 rjparker, Apr 25, 2025
    Last edited: Apr 25, 2025
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  8. Tarek

    Tarek Junior Member

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    The unresolved high voltage leaks after the JDM swap is a concern.
    The ecm seems unlikely. I will send you a contact in San Antonio for a low cost diagnosis.[/QUOTE]
    Thank you @rjparker I am in Lampasas county. 2 hours to San Antonio AND 1 hour to Austin. that would be nice to know Mechanic that we trust
     
    #8 Tarek, Apr 30, 2025 at 12:51 PM
  9. rjparker

    rjparker Tu Humilde Sirviente

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    Trust and value is what you want. Trust at a high price is available at dealers and most Pro shops.
     
    #9 rjparker, Apr 30, 2025 at 7:03 PM
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