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P0354 code

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by T-RIVERS, May 29, 2023.

  1. T-RIVERS

    T-RIVERS New Member

    Joined:
    May 24, 2023
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    Location:
    Two Rivers Wi
    Vehicle:
    2009 Prius
    Model:
    Three Touring
    I have a 2007 with 242,000 miles. The red triangle, check engine are illuminated. Based on the OBD scanner I have, I get the P0354 code. If I continue to drive it after clearing the code the car will eventually shut down and will not go into D or R. In order to get moving I'll have to disconnect the battery for a few minutes to clear all faults. That only buys me a few miles before the cycle repeats itself. I have had to add coolant to the inverter and radiator since this issue started. The car has new spark plugs, coils, MAF, air filter, catalytic converters, 12v battery.
     
    #1 T-RIVERS, May 29, 2023
  2. mr_guy_mann

    mr_guy_mann Senior Member

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    Location:
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    Vehicle:
    2006 Prius
    Model:
    Four
    You need a more capable scantool. The red "master warning" light should have codes set in the hybrid control ecu. Here's a thread reviewing several scantool apps and devices.
    https://priuschat.com/index.php?posts/3290690

    The P0354 indicates that the ECM didn't see a "confirmation signal" from the ignition coil for cylinder 4. Almost always is a failed coil. The new ones were they- Toyota or Denso - and from a reputable source? (NOT ebay or amazon?)

    Might be a wiring fault- but swap in a "known good" coil first,


    Posted via the PriusChat mobile app.
     
    #2 mr_guy_mann, May 30, 2023
  3. SFO

    SFO Senior Member

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    Vehicle:
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    Welcome to PriusChat!!
    Same with those plugs, unless purchased from a known source.

    Swap the bad coil with one of your good coils and see if the obd2 code (DTC) changes.

    FYI : you're moderated until you've posted 5 times.
     
    #3 SFO, May 30, 2023
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