Not to mention it will stay running longer when you come up to a stop light or sign. Not only that, but because the pack is less balanced, your ICE will start and stop more while you are doing regular driving. This may not seem like much, but in reality it is. I found that my control car was running for about 2 minutes or less, while the suspect car, mine, was running for 3 to 4 minutes. This is what I did to understand how long my car was running initially before it shut off. If it is cold out, of course it will run longer, so it is best to really get a good idea of how long your vehicle is running by having it parked in a garage or place that runs a constant temperature. When you turn your Prius on, it should do a pretty quick warm up then shut off. As I mentioned before, you may not even know your pack is bad, but here is a sure fire way to tell. If this occurs, your pack is in really bad shape. One of the signs is that the battery monitor will drop and charge very rapidly. There are a couple signs you should be aware of when driving your Prius with a weak pack. How You Can Tell If Your Prius Pack Is Weak This is brillant, and very much needed to know information. The ICE was running more often because it is trying to bring back balance to that battery pack, and even though it is not setting a trouble code it still is not shutting of soon enough to really gain that extra mpg. Sure enough, the resistance values were not at all consistent like the 2004. I had seen these results before, but now I had a different perspective on why my car was doing what it was doing. Mine does not do this, it keeps running until it sees what it wants. The car started went through a quick cycle and shut off. Looking at the resistance values, I can quickly see the pack balance. Here was a pack that has seen less use than mine, has never been balanced and had perfect balance across the module blocks. I first did this on a known good 2004 2nd Gen. To better wrap my head around this idea, I plugged in my trusty Carista OBD2 reader and opened Dr. What we want to avoid setting a trouble code, so we can avoid breakdown. These modules are trying to get the pack balanced again by over charging in hopes that the balance can once again be restored. This unbalance between the modules causes the others to try and "pick up the slack" where the weak ones are. This burning question had to be answered.Ĭraig and I spoke about battery life expectancy and how as the battery modules age, they become unbalanced. What about the ones you cannot detect though? How do you know if you are having a battery on the brink of failure just waiting to rear up and bite when you least expect it. There are obvious signs of a failing traction battery, some of them are easier to detect than others. Your Prius Battery Can Fail And Not Set A Trouble Code I called a colleague of mine who is a hybrid trainer, and asked him why my Prius, even though the battery was not faulting, seemed to run more often, and not hit the desired fuel target the car is rated for. As my quest to understand the nickel metal hydride battery continues, I find myself starting to go a little crazy with all this information. When it comes to a replacement battery for your Toyota Prius, the options and information you get hit with can seem overwhelming.
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