Intermittent multiple errors ( check hybrid system )

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by CandiK1177, May 10, 2025.

  1. CandiK1177

    CandiK1177 New Member

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    I have a 2016 prius c with 80k miles. Just bought it less than 2 months ago. Out of no where a "Check Hybrid system" error came on along with an "Engine oil pressure low". Oil was fine but topped it off, turned car back on & errors went away. Had autozone check and it threw these codes ( U0073, U0124, U0126 & U0293). Errors went away when I started car so I drove it home.

    Next morning started car and automatically "check hybrid system" error came back along with numerous others ( "engine Oil pressure low", "Drive-start control malfunction" & "brake overide malfunction"). Drove it to dealer and car was driving fine except digital speedometer was fluctuating wrong speeds & the steering seemed tight. Dealer checked and didn't see any codes. Then told me I have to schedule a diagnostic appt but they are booked for the next 2 weeks.

    Checked #1 & #2 ECU fuses and they are fine. Removed 12v battery and put it on battery charger. It read 12.5 when I plugged it in. Took about 30mins to fully charge. Haven't plugged it back in yet. Not even sure if that was the problem.

    I attached photos of the errors and warning lights on dash.
     

    Attached Files:

    #1 CandiK1177, May 10, 2025
  2. MAX2

    MAX2 Senior Member

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    Topping up the oil is the first thing that comes to mind, but it does not always solve the problem with the low oil pressure information. For example, there may be clogged channels or a faulty oil pressure sensor, which are not fixed by topping up the oil.
    Your photos do not show that the "ready" sign is on. The hybrid system does not turn on. The primary procedures for checking the condition of all systems have not been completed and the command to turn on the hybrid system and connect the high-voltage battery does not work.
    The inscriptions on the screen may indicate the reasons indirectly, but will not indicate the exact problem area, which will be indicated as an alphanumeric error code. It is necessary to connect a scanner compatible with hybrid vehicles and read the error codes.
     
    #2 MAX2, May 10, 2025
  3. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    The low oil pressure warning is an emergency condition. You don't get that unless you are dangerously low on oil. Hopefully there hasn't been permanent damage to the engine.
     
    #3 Leadfoot J. McCoalroller, May 11, 2025
  4. BiomedO1

    BiomedO1 Senior Member

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    Did you get a Carfax on the car? Has it ever been in a flood? Are there chew marks on your wiring harness, from rodents?
     
    #4 BiomedO1, May 11, 2025
  5. CandiK1177

    CandiK1177 New Member

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    Checking the oil was the first thing I did and as I started in my post I topped it off. There are other issues and codes that make me believe it may be the CPU.
     
    #5 CandiK1177, May 11, 2025
  6. CandiK1177

    CandiK1177 New Member

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    The dealer showed us the car fax. It was fine.
     
    #6 CandiK1177, May 11, 2025
  7. BiomedO1

    BiomedO1 Senior Member

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    The ECU's on these cars rarely fail. If the car was in a flood or rodents was chewing on your wiring harness, that would explain the intermittent nature of your CAN bus issues.
     
    #7 BiomedO1, May 11, 2025
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