![]() How many miles do you log on your Prius each week? I am wondering whether part of the problem is lack of use so that the 12V battery never has a chance to be fully-charged.Ģ. Make sure that the battery polarity is correct (red is positive, positive to positive) and that all connections are solid, then the Prius should easily start.ġ. I'm probably going to have to have it towed to the dealer.Ĭlick to expand.What procedure are you using to jump-start the Prius? Are you connecting the jumper cables at the 12V battery at the rear of the car or are you connecting to the positive jump terminal in the main relay/fuse box? If the latter hook the negative cable to one of the nuts holding the top of the driver's side strut. I tried to jump it from my wife's car, but couldn't get it started. It was the original equipment, and due to be replaced anyway, which they did for $200.Ī few weeks later, another dead battery after not running the car for a couple of days, another jump, another trip to the dealer.After thinking it over for a day or two, they said that the carbon build-up caused a slow-idling engine which kept the alternator from properly charging the auxiliary battery, allowing it to run down. I've got a 2004 Prius with about 90,000 miles.the auxiliary battery did seem to have failed. Is this a known issue with the Gen II Prius? Thanks for any ideas! But I know very little about these cars (and not much about cars in general), so if anyone has any specific suggestions to put to the dealer, I'd love to hear it. I suspect there is some electrical-system snafu that is draining the aux battery, since it always and only happens after the car hasn't been started for a couple of days. I'm probably going to have to have it towed to the dealer. Hmmm again, but I don't know enough to say they were wrong. After thinking it over for a day or two, they said that the carbon build-up caused a slow-idling engine which kept the alternator from properly charging the auxiliary battery, allowing it to run down. But I'd just given the car a 90K servicing at another shop, which hadn't found any carbon build-up and if that's the reason, why did it start with a jump? Hmmm. They cleaned out the carbon for another $200. They told me a complex story that probably makes sense: there was carbon build-up on the throttle body and other areas, which caused the computer to think not enough gas was reaching the car to run it, so the car refused to start and the computer showed a low fuel code. A few weeks later, another dead battery after not running the car for a couple of days, another jump, another trip to the dealer.It was the original equipment, and due to be replaced anyway, which they did for $200. This time they said the auxiliary battery did seem to have failed. A few days later it died again, so I got it jumped and drove it in again.They couldn't find anything wrong with the auxiliary battery. The first time, I called my auto club and got it jumped, and drove it to a major, reliable Toyota dealer.Since the middle of May, the auxiliary battery has died 4 times after the car was not run for 2 days or so. I've got a 2004 Prius with about 90,000 miles on it, which I bought used about a year ago (so I don't know its whole maintenance history). ![]()
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