Low Gas mileage and code P0A1F

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by EliasG, Nov 25, 2020.

  1. EliasG

    EliasG New Member

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    2006 Prius
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    Hello, first time poster. Mileage is about 210,000ish it's a 2006 Prius Wife and I took the Prius on a road trip from WA to UT, on the trip back we got the triangle of death plus a couple of other lights, noticed my gas mileage shot way down (like I swear I was getting like 15-20 MPG when i was getting 42-45) and the Prius battery was showing up as like 1 or no bars we ended up buying one of those diagnostic things from Walmart, and got a code P0A1F picture attached I literally don't know what the other screen is even for (the one with the symbols) we took it to a firestone and they did something though they said they couldn't work on the battery or some wire system thing? Anyway we are looking at replacing the hybrid battery when we bought it the previous owners had replaced it with a refurbished one 3 years ago and it's been 4 since it's been replaced so it might be due? (I'm not really sure) I've googled the error code but it really was over my head. I've been getting about 38-40 mpg if I go 55 mph or less and the battery seems to stay chargedish but I've always felt the battery since we bought the car hasn't been staying as charged as it needs to (again I'm no expert this is my first Prius) but when I go 65+ the battery drains quickly and my gas mileage plummets should am I doing the right thing by getting the battery replaced, or could this be a way more expensive problem? I check and change the oil when needed with full synthetic.
     

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    #1 EliasG, Nov 25, 2020
    Last edited: Nov 25, 2020
  2. SFO

    SFO Senior Member

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    Vehicle:
    2007 Prius
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    Welcome to PriusChat!!

    That OBD2 code, aka DTC P0A1F has three (3) different subcodes (aka INFs or detailed codes). If the scanner being used isn't offering such, then try again with a toyota hybrid compatible OBD2 scanner. Many prefer using a 'mini-vci' cable and techsteam (dealer tech software). Once you know the associated subcode(s), post them in this thread for additional guidance.

    Do you have a DIY mindset? (you could start by checking the HV battery ECU and connector for potential corrosion)

    Here is a directory that includes the three (3) workups for DTC P0A1F : share.qclt.com - /丰田普瑞斯原厂英文手册pdf格式/Prius Service Manuals 2004/修理手册/04pruisr/05/21bpm/

    Though you aren't exactly close, you also aren't that far from @PriusCamper - let us ping for additional guidance.
     
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