"Check Hybrid System" - No Codes

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by signaigo, Apr 14, 2021.

  1. signaigo

    signaigo New Member

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    I got off the freeway and soon after my engine jumped to a higher sustained rev and the screen said "CHECK HYBRID SYSTEM STOP THE VEHICLE IN A SAFE PLACE IMMEDIATELY." I scanned my car with an OBD-II and got no codes. I erased codes through the scanner and everything went back to normal. I drove home 30 freeway miles no problems.

    The next day I drove back 30 miles to work and soon after leaving the freeway same thing happened. I checked: no codes again. I erased the codes and drove down the road to work fine.

    Just a computer issue that I can take care of? No codes is strange and I can't find anyone with that problem.

    2015 Prius C Two
    110K miles
    Bought it used from a dealer 2500 miles and 2 months ago.
     
  2. PriusCamper

    PriusCamper Senior Member

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    What device are you checking codes with and what were the codes?
     
  3. signaigo

    signaigo New Member

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    Memoscan U480 OBD-II Scanner.
     
  4. PriusCamper

    PriusCamper Senior Member

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    yea... That scanner doesn't have a reference library for hybrid car error codes... Easiest least expensive way to access hybrid battery error codes and subcodes is by using Dr. Prius app with one of these devices: Hybrid battery diagnostic and repair tool for Toyota and Lexus
     
  5. signaigo

    signaigo New Member

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    Thanks for the link! I just ordered the BAFX scanner.
     
  6. dubit

    dubit Senior Member

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    This sounds like a couple instances here where it was a simple matter of cleaning the fan which keeps the hybrid battery cool. At the very least, it's worth a look.

     
  7. kdfchannel

    kdfchannel Junior Member

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    I had the same problem usually prius C will give you the P0A80 replace battery pack then you have to check for sub codes, prius C are well known for fan cooling issues because the fan is just next to the passenger carpet so all dirt moisture will go straight to the battery also if you are in a hot climate you might have to run the car with ac on all the time.
     
  8. signaigo

    signaigo New Member

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    I just got the Bafx scanner and with the app Car Scanner, it showed me a P0A80 code as "pending." I cleared it and scanned again and then it showed again as "permanent."

    The car runs fine and has no check engine light. I keep stuff in my back seat on the floor and it could have easily blocked the fan that I just learned was there. I made sure the fan wasn't blocked now and the fan is clean. I've driven 150 miles with no issue now.

    @kdfchannel How do I check for subcodes?
     
  9. PriusCamper

    PriusCamper Senior Member

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    Easiest way to check for subcodes is Dr. Prius app via one of these inexpensive devices: Hybrid battery diagnostic and repair tool for Toyota and Lexus

    And in some rare cases a P0A80 code won't clear... But in general, it will go away after driving for a while.
     
  10. kdfchannel

    kdfchannel Junior Member

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    PriusCamper likes this.
  11. signaigo

    signaigo New Member

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    Using Dr. Prius on my Bafx scanner this is what I got: I guess no subcodes.
     

    Attached Files:

  12. PriusCamper

    PriusCamper Senior Member

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    Glad you got that set up... This tool will come in handy in the future.
     
  13. kdfchannel

    kdfchannel Junior Member

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    most likely you will have to take a look at the HV battery clean the fan and if you can check for voltages, just be very careful if you don't feel 100% confident on high voltage this could be very dangerous.
     
  14. signaigo

    signaigo New Member

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    So after hundreds of miles of no problems, I got the same Check Hybrid System warning. I immediately pulled over and check the battery fan: not blocked by anything and I could feel it F500DBAE-05EF-4E55-9D80-389DDB3DA069.png 27BBF322-47BB-4FDC-A614-E468A8215B40.png FEF76D49-3208-42FB-9474-F42A06AFBB20.png blowing air.

    I connected my BAFX to Dr. Prius: the battery read out looked normal and the same P0A080 code was still there. Battery temp looked fine too. (Screenshots attached)

    I "cleared" the battery code (but it never goes away) and car went back to normal like always.

    What's going on here??
     
  15. AzusaPrius

    AzusaPrius Active Member

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  16. kdfchannel

    kdfchannel Junior Member

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    the internal resistance on that pack #9 is kinda weird remember you can see good voltages numbers but we don't know about capacities, try to run hybrid assistant and then run the battery check then you can load a report is going to show you the behavior of each pack something like this check this thread you will find lost of test and data performed by mister JIM "Just Another HV Battery Thread and Experiments" TMR-JWAP,
     
  17. kdfchannel

    kdfchannel Junior Member

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    I think this is the voltage for prius C hv batteries, since our car just have 20 modules I tested my battery today after rebuilding a very bad condition HV battery just for testing purposes and I got max voltage of 169 volts.
     
  18. signaigo

    signaigo New Member

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    Fair point, kdfchannel. I'll have to run the Battery Check.

    And yes, this is a Prius C, so with 20 7.2V packs, nominal voltage is 144V. Everything looks fine voltage wise as I drive, with the battery staying almost entirely in the range of 140-180V, outside of which Dr. Prius gives a warning.

    Also my internal resistance of the packs evened out.
     
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