2006, 128K error P0A08

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by RayRob, Jul 27, 2014.

  1. RayRob

    RayRob Junior Member

    Joined:
    Jul 27, 2014
    5
    1
    0
    Location:
    Cartersville GA
    Vehicle:
    2012 Prius
    Model:
    N/A
    I got the Check Engine/VSC/Triangle of Death errors yesterday. Autozone reports it is P0A80 (replace Hybrid battery) though no additional details reported.

    I'm the original owner, and after some reading suspect it could be something else because:

    1. In 8 years, the starter battery has never been replaced.
    2. For about two months, the throttle has been hesitating when first accelerating (within first five minutes of turning it on). Yes, it is the hot summer months (though mild compared to previous summers). And the hesitation occurs even in the morning before things really heat up. This is definitely even worse after the error lights came on.

    I've seen recommendations to replace the starter battery first. And other recommendations for "throttle body cleaning." I'm not a mechanic, but obviously would hate to have the hybrid pack replaced if it is something else.

    Any suggestions greatly appreciated. Thanks!

    Sorry...posted in Prius v section earlier by mistake...

    I got the Check Engine/VSC/Triangle of Death errors yesterday. Autozone reports it is P0A80 (replace Hybrid battery) though no additional details reported.

    I'm the original owner, and after some reading suspect it could be something else because:

    1. In 8 years, the starter battery has never been replaced.
    2. For about two months, the throttle has been hesitating when first accelerating (within first five minutes of turning it on). Yes, it is the hot summer months (though mild compared to previous summers). And the hesitation occurs even in the morning before things really heat up. This is definitely even worse after the error lights came on.

    I've seen recommendations to replace the starter battery first. And other recommendations for "throttle body cleaning." I'm not a mechanic, but obviously would hate to have the hybrid pack replaced if it is something else.

    Any suggestions greatly appreciated. Thanks!
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    95,344
    43,222
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    you're gonna need a 12v battery sooner than later so...
     
  3. nh7o

    nh7o Off grid since 1980

    Joined:
    Dec 10, 2011
    1,686
    332
    0
    Location:
    Hawaii
    Vehicle:
    2009 Prius
    Model:
    II
    P0A80 comes up as a result of voltage differences in the individual modules that make up the battery pack. If the engine is not putting out proper power, then there will be more power drawn from the hybrid battery to compensate, and that could lead to seeing increased voltage drops not normally seen.

    When the car first starts, little power is asked from the engine until it has a chance to warm up. That causes the battery to make up the difference until the engine is up to temp. Letting the car do its warm up cycle before taking off, i.e. about 1 minute, will reduce the draw placed on the battery at that time. If indeed the hybrid battery has gotten weak, then the power that is allowed to be drawn from it is reduced. I'm guessing that is what you mean by hesitation. It is more about current limiting, not a time delay.

    Anything that will help the engine put out rated power, plugs, throttle body, air filter, etc, needs to be looked at. The 12V battery is a potential source of unwanted power consumption if it has a shorted cell, so at least check it, but replacement is a good idea in any case. But the statistic is that Prius' in hot climates have reduced hybrid battery life. Parking in the hot sun is to be avoided. Use window reflectors and A/C.
     
  4. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    9,501
    4,445
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    The hesitation may be caused by the Hybrid battery being at very low charge ie: purple and not contributing to the power and sucking up engine power to charge. I bet your hearing the fan in the back seat run too. When you start off in the am first look at the battery level on the Energy screen and see if its purple. One of the things people report with a close to dead 12 volt is the Hybrid battery purple in the am.
    Also if your 12 volt is really bad the car will throw a red exclamation point on the dash at boot up. Just there for a second but hard not to notice as its so bright. So probably both your batteries are bad. I bet you have had to jump start the car before.

    And alas the POA80 is usually the Hybrid battery needs to be replaced. But your ok as Calif has a 10year/150K warranty on the Hybrid battery
    battery so bring it to the dealer. Should be no charge. No matter who presently owns the car as long as the car was purchased in California.
    Dealer can run the vin.

    And if the throttle body has never been cleaned it needs that too and probably alot of other stuff too.
     
  5. usnavystgc

    usnavystgc Die Hard DIYer and Ebike enthusiast.

    Joined:
    Jul 29, 2011
    3,159
    978
    0
    Location:
    Tucson, AZ
    Vehicle:
    2005 Prius
    Model:
    Four
    He's in Georgia Ed.

    POA80 is almost always a failed traction battery and I've never seen it come up due to a bad 12V battery. Additionally, the other symptoms you mention also point to a failed/failing traction battery. The sluggish performance at start is a telltale sign the battery is weak since the system relies heavily on the battery until the ICE is warmed up.

    If I were in your shoes I'd contact PC user "ericbecky" and see about purchasing one of his charger/reconditioners or replacement battery pack.

    It should be mentioned that the AutoZone OBD code reader will not detect all codes stored/displayed by the Prius ECU's. At a minimum you need to get the "Torque" App and an ELM 327 BT adapter to read the codes properly. MiniVCI is even better.
     
    Britprius, RayRob and edthefox5 like this.
  6. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    9,501
    4,445
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    Oops...the GA looked like a CA to me. Sorry.
     
    #6 edthefox5, Jul 28, 2014
    Last edited: Jul 29, 2014
  7. RayRob

    RayRob Junior Member

    Joined:
    Jul 27, 2014
    5
    1
    0
    Location:
    Cartersville GA
    Vehicle:
    2012 Prius
    Model:
    N/A
    Thanks, everyone, for the informative responses. The general consensus seems to be that I need to replace the hybrid battery pack, though I will look into 12V replacement and throttle body cleaning as well. Too bad that in GA instead of CA I'm out of warranty.
     
  8. RayRob

    RayRob Junior Member

    Joined:
    Jul 27, 2014
    5
    1
    0
    Location:
    Cartersville GA
    Vehicle:
    2012 Prius
    Model:
    N/A
    Belated thanks for the recommendation of user "ericbecky" (Eric Powers). He's a very knowledgeable guy and a class act and provided us with much helpful information over the phone. In the end, though, we decided I should not attempt the install myself because of some back problems. Instead, Atlanta Hybrid Repair installed a remanufactured battery in one day. We were satisfied with their service: Atlanta Hybrid Service and Repair - Atlanta Hybrids by Toyotechs

    Here's hoping that my Gen I battery holds out for several more years, as well as my daughter's 2004. We are taking all of the heat-reduction recommendations. I really wonder what the failure rate is in my area of the country. Strange that our youngest Prius (and the only one we bought new) had this problem first.
     
    usnavystgc likes this.
  9. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    95,344
    43,222
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    congrats, all the best!(y)
     
  10. penquin230

    penquin230 "Golden Hawk"

    Joined:
    Oct 21, 2008
    85
    12
    0
    Location:
    Atlanta, Ga.
    Vehicle:
    2010 Prius
    Model:
    IV
    Ray Rob- I to live in Georgia in South Cobb County. when I bought my used 2005 Prius 3 years ago 1st thing I did was replace my 12v battery feeling that 7 years it was near the end of it's lifespan. Last may I got the dreaded Triangle of death and I opted to order a rebuilt gen 2 battery with gen 3 cells. my final cost was 1570$ after core charge refunded. A good friend offered to install battery (I watched and assisted).I shopped around and talked to several people before picking Falcon Hybrid Solutions in N.J. Falcon Hybrid Solutions, Rebuilt Hybrid Batteries for Hybrid Drive Cars... So my advice would be to replace your battery pack...think of it like getting your transmission rebuilt on a conventional car. Good Luck...
     
  11. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
    15,114
    7,759
    0
    Location:
    Los Angeles, CA
    Vehicle:
    2010 Prius
    Model:
    V
    I'm curious how you know for certain the battery pack you purchased actually has gen3 cells? Is there any way to know?
     
  12. RayRob

    RayRob Junior Member

    Joined:
    Jul 27, 2014
    5
    1
    0
    Location:
    Cartersville GA
    Vehicle:
    2012 Prius
    Model:
    N/A
    Thanks, Flying Biscuit (restaurant fan?).

    We've already replaced ours, and understood there's a good bit of difference between rebuilt and remanufactured. Still, the Gen. 3 option at Falcon is nice, and I like the fact that they offer several warranty options.
     
Loading...