Looking for a Skilled Local Gen 2 Prius Mechanic in Syracuse

Discussion in 'Gen 2 Prius Main Forum' started by deekaljin, May 30, 2025.

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  1. deekaljin

    deekaljin New Member

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    thanks, brian. the instrument cluster is dark. only the “check engine” light goes on for a bit when i start the car then it goes off. i changed the capacitor last year ..DIY job following youtube videos. and it worked until this happened. however, unlike last time when it was totally dark and nothing shows up, this time it is a little different since the engine light goes on like i said. so i am assuming it is something else since the back up camera doesnt show anymore when i reverse, and the front low beams dont work either (high beams do). i scanned the car with techstream and it threw out these error codes:
    - Error C1241
    - Error C1378
    - Error B1248
    - Error B1271

    i read online that sometimes faulty 12v battery can cause these issues and others, but i put in a new OEM 12v battery just 3 months ago.
     
    #21 deekaljin, Jun 4, 2025 at 7:09 PM
    Last edited: Jun 4, 2025 at 7:18 PM
  2. bisco

    bisco cookie crumbler

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    i can't imagine how the car can start itself without a 12 volt
     
    #22 bisco, Jun 4, 2025 at 7:45 PM
  3. Tombukt2

    Tombukt2 Senior Member

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    Yeah that's a pretty good one I have to see that so without without the car would ready you step on gas and engine fires rt up? I no think so .sounds like DC to DC converters intermittent or such . Seems like it's draining 12v or not charging till last minute . With a weak charge system already in place . Bad
     
    #23 Tombukt2, Jun 4, 2025 at 8:31 PM
  4. deekaljin

    deekaljin New Member

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    if it didn’t happen in the dealership, they wouldn’t have believed me either
     
    #24 deekaljin, Jun 4, 2025 at 8:32 PM
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  5. deekaljin

    deekaljin New Member

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    tom, if what you are saying is true, is this car even worth the headache anymore. should i just give up on it?
     
    #25 deekaljin, Jun 4, 2025 at 8:35 PM
  6. Tombukt2

    Tombukt2 Senior Member

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    Actually if I was correct that's a stupid easy fix I wouldn't dump my car for it unless it was in real poor condition I couldn't use it for a work vehicle or so on the AC don't work etc .
     
    #26 Tombukt2, Jun 4, 2025 at 9:48 PM
  7. deekaljin

    deekaljin New Member

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    what is the easy fix for that?
     
    #27 deekaljin, Jun 5, 2025 at 1:18 AM
  8. dolj

    dolj Senior Member

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    The first code implicates a poor 12+ supply to the brake ABS. The other code is saying there is a communications malfunction between the skid control ECU and the brake control power supply assembly.
    The first code is saying that AVC-LAN communication is impossible. The second code is saying the CM has failed (again). The first code might be because of the second code, so fixing the CM would be the first job to tackle if it were me.
    You need to be very wary about what you "read online". Unless you test the battery, you cannot say the battery is good, even if it was replaced three months ago. Even so, I'd be thinking that there might be a problem with 12 V reaching components rather than a problem with the battery.

    Did you or your mechanic actually do any diagnostic testing that is relevant to the codes you found, or are they just loading the parts cannon and hoping for the best?
     
    #28 dolj, Jun 5, 2025 at 4:50 AM
    Last edited: Jun 5, 2025 at 6:20 AM
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  9. deekaljin

    deekaljin New Member

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    thanks, dolji. i ended up dropping the car at the toyota dealership near me yesterday, and still waiting to hear from them.
     
    #29 deekaljin, Jun 5, 2025 at 5:56 AM
  10. Tombukt2

    Tombukt2 Senior Member

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    Well that's the last thing you usually want to do but great. The the first thing to do w comm issues . Is physically test said 12V it's AGM in this we looking 12.3 to .7 at rest. Fall much below that . Things get fun. You're seeing faded faint display . Maybe 12V hasn't much behind it.
     
    #30 Tombukt2, Jun 5, 2025 at 7:50 AM
  11. deekaljin

    deekaljin New Member

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    what would be a fix for something like that?
     
    #31 deekaljin, Jun 5, 2025 at 3:25 PM
  12. Tombukt2

    Tombukt2 Senior Member

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    With a dim display and everything cutting out first thing I'd be doing is load test 12V battery it has to pass period . Until that verified you read thru here it's about 20 to 15 posts we get to oh by the way the 12v fell flat on its face . Replaced like a new car . We're at about 15 or so now I imagine
     
    #32 Tombukt2, Jun 5, 2025 at 3:32 PM
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