Red Brake Light, ( ! ), VSC and ABS light ON. Please help!

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by xeanb0b, Jan 19, 2022.

  1. xeanb0b

    xeanb0b New Member

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    Hi Priuschat, I have 2009 Prius with 250k miles on it and have the Red Brake Light, ( ! ), VSC and ABS light on the dash. I went to AdvancedAuto to get the codes scanned since I don’t have a scanner. I have a multimeter.

    The codes are:
    -C1311 Open circuit in Main Relay1
    -C1343 Malfunction in Hydraulic System (Right Rear)
    -C1344 Malfunction in Hydraulic System (Rear Left)
    -C1377 Capacitor Malfunction
    -U0293 Lost Communication with Hybrid Vehicle Control Module

    Not sure if this is related but the lights came on after I drove my car 4-5 miles with the park brake on couple months ago. I didn’t notice it as the dashboard goes sometimes black (I reconnect the 12V battery to fix this).
    I didn’t get it fixed since the car was driving fine and due to financial issues. I got the front brakes replaced without the rotors back then and need to replace it again (squeaky brake).

    I have another Prius and I tried switching out the fuses of ABS MAIN1, 2 and 3 (10A) and ABS-1 (25A) + the two green Relays on spot ABS NO.1 and NO.2. I’m assuming those are working properly since I don’t have any lights on my other Prius. The lights are still on and I’m not sure if I need to try to erase the codes with a tool, I just disconnected the 12V battery for couple minutes.

    Also, I checked the Battery Voltage under Vehicle Signal Check Mode and it shows 12V when the engine is not on, 11.6V when headlights on, and 13.9 when the engine is on.


    ** Sorry for the long post, I just wanted to explain it as detailed as possible. What could be the issue with my car and how should I start troubleshooting it?
    I replaced the inverter pump, catalytic converter and the coolant flow valve previously. I’m pretty handy and want to fix this by my own if possible. Any advice would be appreciated. Thanks in advance!
     

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  2. SFO

    SFO Senior Member

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    Did you need the workups for the above codes (DTCs) that you've posted, or can you search for and find them yourself?
     
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  3. xeanb0b

    xeanb0b New Member

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    I found the workups on other posts but was confused. I'm a beginner and don't know where to start to be honest. I was also wondering if those issues are related.
     
  4. SFO

    SFO Senior Member

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    I would start by checking/testing the fuses and relays first, before digging in deeper.

    For anyone following, below are the workups for the above OBD22 codes, these are from an older 2004 manual and may not be useful :

    Here is the workup for DTC C1311 : 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/cic13111.pdf

    Here is the workup for DTC C1343 : 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/cic13416.pdf

    Here is the workup for DTC C1344 : 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/cic13416.pdf

    Here is the workup for DTC C1377 : 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/cic13774.pdf

    Notice how the workup for DTC 1377 has eight (8) related INFs (subcodes, detailed codes, or secondary codes), knowing the INF for a DTC may help in diagnosing the problem in a timely fashion, without wasting excessive time or money. You'll need a OBD2 scanner that can retreive the subcodes. Many prefer a mini-vci cable and techstream (dealer tech diagnostic software) installed on a windows device.

    Here is the workup for DTC U0293 : 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/05/2054m/ciu0293.pdf

    For DTC U0293, you might find minor relief in this thread : U0293 Lost Comm w/ Hybrid Powertrain Control Module | PriusChat
     
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  5. Tombukt2

    Tombukt2 Active Member

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    Does the brake pedal feel normal if you smartly step on the brakes can you lock up all four wheels all four wheel wells will be smoking I've been dealing with this issue since I bought this car The lights came on a week after I bought it no red triangle but the all the orange lights are on and I've traced it down to the left rear wheel pressure My brake pedal is fine My brakes work fine My ABS is not In other words if I stomp on the brakes get on them right hard it's just like my Corolla all four wheels can lock I've been driving this car like this for almost 2 years till the brake pedal goes hard and needs two people to stand on it I won't even begin to start fixing it That's what happened to my '05 when all the lights came on a week later it was undrivable you'd need two feet on the brakes standing The '09 the lights have been on two years and the brakes work like normal like a normal Corolla brakes without ABS
     
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  6. xeanb0b

    xeanb0b New Member

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    Not sure if it locks 4 wheels but the brake feels normal to me. Its easy to press the brake pedal.
     
  7. BuyJapanese

    BuyJapanese Member

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    If the resting voltage on your other Prius battery is closer to the ideal of 12.6, you could try swapping batteries to eliminate battery issues. It sounds like there's more going on than a bad battery but that would be an easy thing to eliminate if you can.
     
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  8. xeanb0b

    xeanb0b New Member

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    Thank you!
     
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  9. xeanb0b

    xeanb0b New Member

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    Thanks I will do that, is it possible that I damaged something in the back wheel by driving with the park brake on?
     
  10. ChapmanF

    ChapmanF Senior Member

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    The codes you reported do not suggest that.
     
  11. Javcarbe

    Javcarbe New Member

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    I'm new my friend give me a Prius 05 with lights on code c1343 , i noticed the rims are 17" when the car should use 15" that could be the problem? I tried resetting the lights with the paper clip in the OBD2 port.
    Check the battery in the car monitor 14.1
    The start battery i charged it
     

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