Prius 2005 P0420, C1241, C1253, C1313

Discussion in 'Gen 2 Prius Technical Discussion' started by Strahinja Trecakov, Apr 14, 2023.

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  1. Strahinja Trecakov

    Strahinja Trecakov New Member

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    Hello fellow Prius owners,

    Yesterday I got my engine check light and an exclamation point triangle light on my dashboard. Drove to the nearest AutoZone to read the codes, and got these P0420, C1241, C1253, C1313. No LAN codes on the car's display.
    I had my Catalytic Converter stolen a few months back and I have replaced it and the O2 sensor, and drove it without any issues/light for over 7000 miles.

    In March I had an issue where I thought maintenance required meant something was wrong with the car. I had posted my issue/troubleshooting here (Prius 2005 weird issue | PriusChat), however, it seemed like I didn't have any issues and that it was just a reminder for 5K mile maintenance. Anyways, I had already replaced my 12V battery and the C1241 was still there, but no engine check light was on.

    I would like to know if anyone has a suggestion on how should I approach troubleshooting and fixing these codes/issues? Should I start with relays first and work my way up or?

    All suggestions are welcome and thank you in advance.
     

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    #1 Strahinja Trecakov, Apr 14, 2023
  2. bisco

    bisco cookie crumbler

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    Check the connections and if good, the 12volt load tested, you never know
     
    #2 bisco, Apr 14, 2023
  3. ChapmanF

    ChapmanF Senior Member

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    The fortune cookie for C1241 might say "low battery positive voltage", but in reality the ECU that sets that code has no way to know whether the problem is the battery itself or in any of the wiring or connectors between the battery and the ECU where the voltage is measured.

    So the troubleshooting instructions for C1241 in the repair manual can be valuable to follow. (If the code just always meant the battery, they'd be trivial.)

    Toyota Service Information and Where To Find It | PriusChat
     
    #3 ChapmanF, Apr 14, 2023
  4. SFO

    SFO Senior Member

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    Did you replace the sensor with an OEM from the dealer, or Denso. Where did you purchase this sensor, retail, online, or ??
    Some of the codes (DTCs) may have related three (3) digit subcodes (INFs or detailed codes), knowing those may help.

    Here is the workup for DTC P0420 : https://attachments.priuschat.com/attachment-files/2017/02/120177_p0420.pdf

    Here is the workup for DTCs C1241 and C1242 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Prius%20Service%20Manuals%202004/%E4%BF%AE%E7%90%86%E6%89%8B%E5%86%8C/04pruisr/05/21avn/cic12414.pdf

    Here is the workup for DTCs c1252 and c1253 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/21avn/cic12525.pdf

    Here is the workup for DTCs C1311, C1312, C1313, C1314 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8CPDF%E6%A0%BC%E5%BC%8F/Prius%20Service%20Manuals%202004/%E4%BF%AE%E7%90%86%E6%89%8B%E5%86%8C/04pruisr/05/21avn/cic13111.pdf
     
    #4 SFO, Apr 14, 2023
  5. Strahinja Trecakov

    Strahinja Trecakov New Member

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    Thank you all for your suggestions. Sorry, but I had no time to work on it earlier.

    Here is what I have tried:
    I have unplugged the O2 sensor and drove it for 10 mins so that it can register that it is missing. I plugged it back in and drove for around 20 mins. Stopped by AutoZone to check the code again and now I have 2 new codes(C1310 and C1259). The sensor was replaced when my catalytic converter got stolen, and I have a Denso 234-4623 that was purchased from Amazon. I have checked the relays and all those in question are "clicking" when a 12V is applied.

    I will go over all workups hopefully this week and will keep you updated.
     
    #5 Strahinja Trecakov, Apr 24, 2023
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  6. ChapmanF

    ChapmanF Senior Member

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    Those just mean that there are other codes being reported by the HV control ECU. Is the scan tool you are using not showing you those?
     
    #6 ChapmanF, Apr 24, 2023
  7. Strahinja Trecakov

    Strahinja Trecakov New Member

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    The auto zone scan tool is showing P0420, C1241, C1253, C1313, C1310 and C1259.
     
    #7 Strahinja Trecakov, Apr 24, 2023
  8. ChapmanF

    ChapmanF Senior Member

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    It's not showing you what the HV control ECU codes are, then (which we know you have, because of the C1259 and C1310).

    So a scan with a better tool could be helpful, in order to have the complete picture.
     
    #8 ChapmanF, Apr 24, 2023
  9. Strahinja Trecakov

    Strahinja Trecakov New Member

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    Can you suggest any that are good for Toyotas?
     
    #9 Strahinja Trecakov, Apr 24, 2023
  10. ChapmanF

    ChapmanF Senior Member

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    Toyota Techstream on a Windows laptop is what a dealer would be using, and is described in multiple threads here.

    We also have a thread reviewing some other options.

    Gen2 OBD2 app review | PriusChat
     
    #10 ChapmanF, Apr 24, 2023
  11. Strahinja Trecakov

    Strahinja Trecakov New Member

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    I have found a better OBD2 reader and used Car Scanner app. Here are the findings.

    Car Scanner ELM OBD2
    Version: 1.98.0/400980/GP
    DTC report
    Connection profile: Toyota Prius Gen. 2 (2004-2009)Date: 4/25/2023 9:30:40 PM
    ============================
    OBD-IIOBD-II
    DTCs: 5
    ----------------------------
    P0037 [0x0037]
    Heated oxygen sensor (HO2S) 2, bank 1, heater control - circuit low
    Oxygen Sensor Heater Circuit Low Input (Bank 1, Sensor 2)
    Status: Confirmed
    ----------------------------
    P0420 [0x0420]
    Catalytic converter system, bank 1 - efficiency below threshold
    Catalytic Converter System Bank 1 Efficiency Below Threshold
    Status: Confirmed
    ----------------------------
    P0A80 [0x0A80]
    Hybrid battery pack Deterioration
    Status: Confirmed
    --------------------------
    P3021 [0x3021]
    High Voltage Battery Module 11 Fault; Battery block 11 malfunction
    Status: Confirmed
    ----------------------------
    P3000 [0x3000]
    High Voltage Battery Fault; HV Battery Malfunction
    Status: Confirmed
    ============================
    Engine control unit #1Engine control unit #1
    DTCs: 2
    ----------------------------
    P0037 [0x0037]
    Heated oxygen sensor (HO2S) 2, bank 1, heater control - circuit low
    Oxygen Sensor Heater Circuit Low Input (Bank 1, Sensor 2)
    Status: Confirmed
    ----------------------------
    P0420 [0x0420]
    Catalytic converter system, bank 1 - efficiency below threshold
    Catalytic Converter System Bank 1 Efficiency Below Threshold
    Status: Confirmed
    ============================
    Hybrid engine systemHybrid engine system
    DTCs: 1
    ----------------------------
    P3000 [0x3000]
    High Voltage Battery Fault; HV Battery Malfunction
    Status: Confirmed
    ============================
    HV battery
    No DTC found.

    I am also uploading all sensor data. Sorry for too many images, I didn't figure out how to export that from the app.
    From these codes its clear to me that I have issues with the hybrid battery. Should I clear the codes and see if they come back? Replace the battery?

    Any suggestions are welcome and appreciated. Thanks a lot!
     

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    #11 Strahinja Trecakov, Apr 26, 2023
  12. SFO

    SFO Senior Member

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    That is one option. Do you have some basic tools and a DIY attitude?

    The US (the Location mentioned in your bio) is a largish area, which metroplex is closest to you?
     
    #12 SFO, Apr 26, 2023
  13. Strahinja Trecakov

    Strahinja Trecakov New Member

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    I am all in DIY attitude and am planning to do it myself. No, I am in Las Cruces, NM.
     
    #13 Strahinja Trecakov, Apr 26, 2023
  14. SFO

    SFO Senior Member

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    If time is on your side, then you can swap out one or more modules in bad block #11, then balance or cycle using a grid charger.

    If vehicle downtime, or the possibility of playing wack-a-mole (going into the HV battery again) in the future isn't desired, then buy new.

    How many miles are on the vehicle, and is the current HV battery the original or a replacement?
     
    #14 SFO, Apr 27, 2023
  15. Strahinja Trecakov

    Strahinja Trecakov New Member

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    The car has 182K miles and this is still the original one. It deserves a new battery:)

    Can you suggest the best place to purchase one? I have read on this forum that people send their batteries to get refurbished instead.
     
    #15 Strahinja Trecakov, Apr 27, 2023
  16. SFO

    SFO Senior Member

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    Never buy refurbished, but you might be able to find a (verified) low mileage wreck for 'cheap'. Very few will recommend refurbished.

    Either a "new" OEM at 1650+, new NiMH aftermarket (2k ?), or new Lithium aftermarket (2300 ?).
     
    #16 SFO, Apr 27, 2023
  17. Strahinja Trecakov

    Strahinja Trecakov New Member

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    Thank you. Which one do you suggest from these 3?
    I went to a Toyota dealership and they quoted me $2900 for an OEM + $650 for a labor.
     
    #17 Strahinja Trecakov, Apr 28, 2023
  18. bisco

    bisco cookie crumbler

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    call more dealers, they are competitive
     
    #18 bisco, Apr 28, 2023
  19. dolj

    dolj Senior Member

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    The order they are given is the order of preference. OEM is tried and true with a proven track record.
    Shop around dealers, this is a competitive job. FYI, the cost to the dealer is in the ballpark of $1620 wholesale, so $2900 for just the battery is just bonkers.

    Use Toyota Parts Center Online to shop from your home and get prices from dealers that are within driving distance of you. See if you can get one or more of the dealers nearest you to price match.
     
    #19 dolj, Apr 29, 2023
  20. SFO

    SFO Senior Member

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    Unfortunately not all dealers are listed in the results, and I've inquired about this at both the listed and unlisted dealers, and no one seemed to understand why or how a dealership is and isn't listed on the corporate website. Best to call/visit the unlisted as well.
     
    #20 SFO, Apr 29, 2023
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