Prius (Gen 3) :: 12v Battery Discharged Very Often When Parked Outside In Cold Weather

I got a new Prius Plug-in 2012 and when the cold weather came this winter, which isn't that cold at 40F, the 12v battery seems to get discharged very often. This week, I must have jumpstarted the car twice already. The 12v battery seems to get drained when I park outside in the (not so) cold, or when I park underground for hours. I also notice that the traction battery gets filled up; it's as if the 12v battery drains into the traction battery.

(I leased a Prius 2010, not plug-in, for 3 years and this never happened even if I parked it for days in even colder weather.)

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Prius (2010-12) :: Discharged 12 Volt Battery Now Won't Have Enough Power?

We accidentally discharged the 12 volt battery in our 2010 Prius with an interior light. By the time we noticed the car didn't have enough power to turn on. I removed the battery last night and charged it with an intelligent charger and have since reinstalled.

Will this have any long term effect on the battery? It seems these 12 volts are sensitive compared to a standard car battery. I have discharged numerous 12 volt car batteries with no major long term consquences after a recharge.

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Prius Plug-in 2012-15 :: Battery Apparently Discharged / No EV Range

I picked up our Prius plug in on Thursday evening, fully charged from the dealership in Oakland. We drove it home, about 4 miles, in EV mode and then plugged it in for the night. In the morning the car was fully charged. At 8:00 a.m. I drove the Prius up hill about 1.5 miles in EV mode to our car pool pick up point and left it parked on the street for the day. Car was parked on up hill slope. I believe all lights were off. When I got back at 5:30 p.m. to drive it home the battery was apparently discharged and there was no charge or EV range when I selected EV mode. I drove home on ICE in hybrid mode.

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Prius (2004-09) :: 2008 - Battery Discharged / Clicking Under The Hood

I am currently driving my dad's 2008 Prius because of other vehicle problems. When my daughter got out of the car last night, she did not get the door closed all the way. It sat that way all night in a VERY cold garage. Now it will not start and the malfunction indicator lamp, which looks like a check engine light to me, is very faintly flashing. I figured the battery was discharged and attempted to jump it per the manual's instructions. It still will not start and the lamp is still flashing. I can hear clicking under the hood, as well.

Do I just need to leave it hooked up to the jump vehicle longer? OR, is this a "dealership necessary" issue? I would have to tow it to a dealership, since it cannot be started, which creates a whole new set of problems. ( The car is parked in my garage and would be very difficult to get it towed.) What I may be doing incorrectly?

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Prius (2004-09) :: Death Triangle With Lots Of Codes Diagnosed

Upon turning on my car and driving a few feet I had the Red Triangle of Death, Yellow VSC, Yellow (!) Indicator, and check engine light and I'm trying to figure out where I should start working on the issue.

The Codes were as Follows:

P3000 (subcode 123)

C0200

C1241

C1300

C1310

C1259

A little history:

About 3 months ago I had an issue with the hybrid battery and replaced a battery cell which stopped all issues. About 2 weeks ago I replaced the coolant inverter pump and until today there has been no errors, CELs, or any negative performance.
This is a Gen II, 2007 prius with almost 200k miles.

Unfortunately I had plans that I could not reschedule and made the drive to the location and drove back. I had serious battery drain and it was almost always at 1 bar of battery, sometime reaching up to 2 bars. There is also the sound of a fan coming from the back seat, which I assume is the HV Battery fan, but it is on regardless of if I have air conditioning or not. A/C is working fine. When I returned home the battery charged almost up to full bars, but when I came to a stop the battery drained in about 10 seconds leaving me with very low power to keep moving. After that whenever I slowed down the teal arrows showing a recharge of the battery were gone and the battery seemed to refuse to recharge.

Steps taken so far:

I topped off my engine coolant in the front reservoir as it seemed a little low, but I didn't add much before it was full. The other reservoir near the engine was just about full and taking off the other cap showed coolant filled to the top.

I tested the 12v battery with my voltmeter which came back reading 12.7.

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Prius (2004-09) :: Scangauge To Throw Lots Of Pending Codes

I occasionally drill-down to check on pending codes, and my 2007 Prius likes to generate a LOT of them. Maybe pending codes don't count unless they escalate to an active code that triggers the check engine light.

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Prius (2001-03) :: Replaced HV Battery - Error Codes With Triangle Came On

I successfully replaced the HV battery on my own and it was so easy even this girl to do it! I drove the car about 300 miles when I got the triangle of death warning light again yesterday. I took my 2002 Prius to the dealer to read the codes but how to borrow a scanner (or whatever) from Autozone and do it myself.

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Touareg :: Battery Has Been Discharged Totally?

I went away for a week and upon returning, I couldn't get my V6 to start. I couldn't get anything to work....auto lock, headlights......and then I discovered the battery has been discharged totally. I am really shocked as how could this have happened. I have checked everything but nothing seems abnormal as I remember checking every detail before locking up the car and leaving for my trip. This is the longest time which I did not use my car. Before that the longest was less than a day. Btw, the car is only 2 months old.

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Prius (Gen 2) :: Hybrid Battery Cooling Fan Running Constantly With Lots Of Warning Lights

Some years back my "farm" '05 prius when a host of bells and whistles went off, cooling fan ran more than normal, and I lost power a couple of times. Turned out this farm prius had an accumulation of dirt, dog hair, hay and other debris that needed to be cleaned out. You got me through the whole process, and the car's run fine until.... . Fast forward a couple of years to 200,003 miles. Now the cooling fan is running pretty constantly, the red triangle stays lit, the check engine light comes on, the (!) is on, and the VSC light is on. Haven't hooked it up to check codes, but did check cooling fan and it's clean. Would it possibly possibly better to change the 12 volt battery?

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Prius (2004-09) :: Codes PO3000 And PO38A - Bad Battery?

Got these bad codes yesterday on my 2007. Toyota service said the car needs total hybrid replacement for about $3,300. The car has 188K on it. Does this sound right?

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Prius (Gen 2) :: Hybrid Battery Drained / List Of Codes Scanned

I'm hoping I can get some diagnostic insight into a problem I just started seeing on my 2007 Prius. I have had the Prius for a little over 4 years. Currently around 123K miles.

Starting two days ago I noticed when I started driving that the engine was constantly running and when pulling out from a stop sign just up the road from my house the acceleration was sluggish. I look at the MFD and see the hybrid battery is nearly drained. Unusual because it was blue or green when I parked the night before. Driving for a few minutes, the battery fills back up and driving is normal. The only warning light is for a tire pressure sensor which just started to come on that day. Over the last two days I get the same thing at start up. Hybrid battery is drained. Lights aren't left on over night. Tire sensor light is constantly on but I checked the tires and pressure is good all around. Nothing plugged in anywhere to drain battery. The 12V battery was replaced maybe a year or so ago with an Optima yellow top, so not likely the issue. I checked diagnostic codes in the MFD and came up with a lot of codes:

LAN Monitor EMV:

01-DB 190- 40- 5

01-DE 178- FA-1

01-DB1F1- E5- 4

01-DB 110- 8A- 7

01-DB 178- 46- 3

LAN Monitor NAVI:

01-E3 - 00- F

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Prius (2001-03) :: Replacing Aux Battery With Regular 500 - 600 CCA Battery

I wanna know if I can take a regular car battery 500-600 cca to replace the old aux battery.

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Prius (2004-09) :: Codes P0A80 And P3023 - Hybrid Battery Replacement?

I turned on my car this morning to find myself faced with a variety of colored lights, including a little red car on a black bar on my MFD. Drove straight to the dealer and received word that the car was throwing codes P0A80 and P3023 and they recommend replacing the hybrid battery. I have a 2006, have done all the recommended maintenance at the dealer and it has about 133,000 miles on it.

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Prius (Gen 1) :: Codes P3006 And P3000 Displaying And Indicating Faults In Main Battery

I have a 2001 Prius with about 110K which I have owned since new. It displayed the hybrid warning light (as well as check engine) 2 weeks ago and I took the car in to the local dealer.. After a little muddling around they came up with codes indicating that the computer for the battery was going. I purchased that Part Number: 8989047030 Part Description: electrical, battery, computer H.V. SUPPLY. and the dealer installed that part a couple of days ago.

Now the following codes (and only these codes according to the dealer) are displaying and indicating faults in the main battery: P3006 and P3000.

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Prius (2004-09) :: 2005 - Codes C1241 And C1300 Generated After Battery Replacement

So my check engine light had been on intermittently for the past few weeks. I thought it was for the oil change as it was about that time and ignored it.

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Prius (Gen 1) :: 2001 - Warning Triangle But No Codes

A 2001 Prius is getting a warning triangle. No check engine light, and with my OBDII scanner, it shows there are no codes. I can erase and the triangle goes out, but it comes back on eventually. It seems only if the car is driven a long time/distance it comes on, indicating some heat issue perhaps.

The 12v battery is good, the radiator coolant is good, the inverter coolant is good and flowing. The washer fluid hose is broken, could THAT give the death triangle? There must be a way to have the cars display whats wrong with the fancy software and touch screen?

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Prius (2001-03) :: Engine Revs But No DTC Codes?

I have no codes on screens, engine revs and gas mileage has gone down to 30 mpg from 40s this summer. The toyota service adviser said the poor gas mileage was from running the heater since it is around 20 degrees these days in minnesota. My innova scanner shows no DTC's. But my question is do I need a scanguage II or other scanner to get the battery codes? Am I missing them using the innova scanner? What scanners are available for 2001 prius.

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Prius (Gen 1) :: 2001 - No Reverse / Codes P3101 And 12689

My 2001 Prius has 77K. It has done warning lights before and always been a gas cap that was not tightened or a misfire code three times since I bought it last spring. It has been driven very little when I was rear-ended and my Camry was totaled. It coughed a little when I started it, but had no problem driving the first 40 miles. I stopped for about 5 minutes to stretch. When I tried to start it to continue to work, all the warning lights came on and it died. I tightened the gas cap and restarted the car to have it die 2 more times. Third time it stayed on and I was planning on limping two blocks to AutoZone to have the codes read, when it rolled to a stop. No forward, no reverse. By the time the tow arrived, it would go forward. The codes were P3101 and 12689.

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Prius (2001-03) :: P3006 And P1259 Codes But No Loss Of MPG

Check Engine light is on but car seems to be running OK (getting 40mpg). I do notice that the car seems to rely on the Gas more than the battery than it used to.

My question is, will MPG start to drop gradually until one day the Traction Battery is just dead or will the car go from running well to not running well in minutes.

My shop says it needs a battery but it's not in the budget at the moment so I need to see if I can postpone it until the new year.

2003, 145k, just bought it 3 months ago

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