Prius Doesnt start. Dashboard lights up

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by PriusGenxFixer, Feb 24, 2026 at 10:22 PM.

  1. PriusGenxFixer

    PriusGenxFixer New Member

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    2007 Prius
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    I got a non working prius from someone who maintained it very well but it stopped working and they thought it was the HV battery. I got an alternatve HV battery and replaced 4 modules which had a 5V and put it back in with a new voltage of 15.6
    The initial battery error is gone. Now I face the following problem
    1) When i start the engine seems to run for 5-10 seconds and shuts off
    2) I get the "Triangle of death"
    3) The fuel gauges reads flashes empty when i start in "Non REady" mode.
    4) In ready mode the fuel shows full
    5) Tried to fill fuel and it over flowed. #4 is correct.
    6) 12V battery is new but drained possibly becasue of SKS and the parking lot of close to home where the key is. I have diabled SKS (with Key button flip by Driver's knees)

    Next Steps
    1) I have added a new battery and kept it over night to see if battery drain will be elimated. Will report
    2) I may have to check the fuel pump relay and fuse. Any help or debug around this?
    3) Pull the fuel line from engine and start the pump using 12v. Any suggestions?

    Thanks a bunch for your help on what else i need to do.
     
    #1 PriusGenxFixer, Feb 24, 2026 at 10:22 PM
  2. PriusGenxFixer

    PriusGenxFixer New Member

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    Apologies DTC code is p0a0f. I also see a Fuel empty code (I think p3193) but i didnt take a note of it because it may not be relevant

    2007 Prius with SKS and 85k miles
    Old owner claims it stopped working just so "suddenly"
     
    #2 PriusGenxFixer, Feb 24, 2026 at 10:42 PM
    Last edited: Feb 24, 2026 at 10:49 PM
  3. ChapmanF

    ChapmanF Senior Member

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    P3193 is the most relevant code. It is from the engine control module, telling you why the engine isn't running.

    P0A0F is just a code from the HV control ECU saying "hey, I wanted the ECM to run the engine and it won't, what gives?".

    P3190/P3191/P3193 are an interesting family of codes. Essentially, P3190 tells you the engine is running really poorly. Code gets changed to P3191 if that happens while the engine is trying to start, and changed to P3193 if that happens while the combination meter doesn't think there's much fuel in the tank.
     
    #3 ChapmanF, Feb 25, 2026 at 9:59 AM
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  4. BiomedO1

    BiomedO1 Senior Member

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    Your engine isn't starting and you've got a parasitic draw someplace. A new battery shouldn't simply discharge all by itself, unless it's bad or there's a parasitic discharge.
    As for the engine, back to basics, fuel, air, spark - also make sure that thief deterrent alarms is disabled........
     
    #4 BiomedO1, Feb 25, 2026 at 10:51 AM
  5. mr_guy_mann

    mr_guy_mann Senior Member

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    I would clean the throttle body bore (& carefully clean the MAF sensor as well).

    The engine isn't "running" - the hybrid system will spin the engine at 1000 RPM for up to 10 seconds when it tries to start. Do that enough times and you will discharge the HV battery.

    You need to check basics - does the fuel pump work? - what do the spark plugs look like? - any mouse nests in the air filter or exhaust system etc.

    Posted via the PriusChat mobile app.
     
    #5 mr_guy_mann, Feb 25, 2026 at 12:42 PM
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