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Error code

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by bruno raphael, Jun 30, 2020.

  1. bruno raphael

    bruno raphael New Member

    Joined:
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    reseda
    Vehicle:
    2009 Prius
    Model:
    Two
    Hello everyone I'm pretty new to this forum but I always hear good things about people using them for help.
    I have a 2009 prius that I had recently Purchased but it came with a few problems.
    The car has low mileage at 61k which caught my attention and that was the main reason for my purchase.
    But once I turned the car on it had the abs light on and also the big red triangle I ran a obd2 reader on it and got back some codes which are C1241 and C1310 I'm hoping someone would have a bit of insight on what the issue may be and if its a relatively simple fix.
    Through my research it all pointed to the auxiliary battery of the car so I had swapped it with another prius I own also i changed the connector on top and the black box thats next to it (tbh not sure what that is called)
    Through my research it also lead me to a few other things that could be wrong but I dont want to get ahead of my self and start changing all sorts of things when it could be something simple (hopefully)
    Another thing is when I decided to drive it to work this morning thinking that it would alright. I lost all power on the freeway and the motor shut off. All the electronics worked fine on the car but i had to turn it off and on again to get the motor going.
    I'm not sure if that is related to the codes that came up or if that is a completely different problem which i hope it isnt!
    Feel free to comment and give me some tips of the issue and how to possibly fix it.
    Thanks!

    Posted via the PriusChat mobile app.
     
    #1 bruno raphael, Jun 30, 2020
  2. SFO

    SFO Senior Member

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    Vehicle:
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    Welcome to PriusChat!!

    The OBD2 scanner doesn't appear to be hybrid compatible, try some other OBD2 scanners at the various auto parts retailers.

    For retrieving OBD2 codes (DTCs), many will use a 'mini-vci' cable and a copy of techstream (dealer tech software) on a windows device.

    You can also use an App like Dr Prius, but first find a quality OBD2 bluetooth/wifi adapter : Hybrid battery diagnostic and repair tool for Toyota and Lexus

    Have you checked if the inverter coolant pump is functioning, and or has it been replaced recently?

    Check the dealer service history by running the VIN @ https://www.toyota.com/owners
     
    #2 SFO, Jul 11, 2020
    Raytheeagle likes this.
  3. dolj

    dolj Senior Member

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    Vehicle:
    2007 Prius
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    N/A
    C1310 is often seen with C1259; they both mean that the brake ECU has heard the news of trouble in the hybrid system, so the codes from the HV and battery ECUs should be reviewed to get the real scoop.

    Another thing that often happens is people read codes using scanners that don't know about the HV and battery ECUs but do know about the brake ECU (most cars have one), so the scanner will show the C1310 (and C1259), but not the codes that are the reason you have C1310 (and C1259).
    It called the Brake Control Power Supply – BCPS
    Which, it is assumed, did not fix the problem. This is the often-repeated misinformation about this code. As this code can occur when driving - or at least when the car is in IG-on or READY - (you can confirm this by looking at the freeze frame data), it means the 12 V bus was supplied by the inverter's DC/DC converter and not the 12 V battery. The question is to work out why the 12 V at the skid control ECU dropped below 8.9 V.

    C1241 is memorized when the power source voltage for the skid control ECU drops or the voltage for the ABS NO. 1, ABS NO. 2 relay operation drops. Codes may be memorized when the voltage of the auxiliary battery temporarily drops (below 8.9 V). There are 4 INF (or sub-codes) - 81, 82, 83, and 84 - that can pinpoint the affected area more precisely. The INF codes can be found in the freezeframe data.

    C1242 (blinky:42) INF 87 means voltage is applied to the IG2 terminal, but not applied to the IG1 terminal for at least 4 sec.

    Trouble Areas:
    • ABS NO. 1 relay
    • Harness and connector
    • Skid control power supply circuit
    • Brake control power supply assembly
    • Hybrid control system
    I hope that helps.
     
    #3 dolj, Jul 14, 2020
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