First let's cover the "basics" in terms of the possible causes of engine surging/hunting, where engine speed suddenly (or slowly) changes.Ī wide variety of issues can prompt an engine surge. Our experienced technicians are always ready to assist, simply call us at (800)-886-9926, or contact us directly on our website.In this article, we'll discuss engine idle issues, surging and "hunting" problems. If you decide you need professional help, consider giving Solo PCMs a call. Our quality, remanufactured auto computers are available for up to 80% less than at the dealer and come with a lifetime warranty. Luckily, we’re here to offer you the best possible solution should you need to replace your PCM. Not only does it require some technical knowledge, but replacing your PCM itself is can be intimidating. If You Need a Professional, We’re Thereįixing any kind of PCM malfunction can be a real headache. We talk about more specifics in our PCM buying guide. You’ll want to be absolutely certain that you’re buying the PCM that your manufacturer recommends for your vehicle. If it turns out that the problem is with your PCM, you’ll need to replace it. If power is flowing normally, the issue is with your PCM itself. If there’s a short there, it may be possible for a mechanic to simply replace your PCM’s power supply. Use your multimeter again, and check the (+) and (-) connections on your PCM. If everything else is in good working order, you’ll need to check your PCM itself for trouble. If everything reads normal, it’s time to check the PCM. Then, use a multimeter to check both the (+) and (-) circuits on your CAN C bus for shorts. Use your code reader to see if there are any codes that indicate trouble with the CAN C bus. The next thing to do is check your Can C Bus. Replace the wiring harness immediately and see if it solves your problem. If you find any arcing, exposed wires, or damaged insulation, don’t mess around. This is a pain, but it’s a necessary step in order to find a remedy. The next thing to do is to check your PCM wiring harness for faults. If the problem is with your ECM, diagnose that carefully before proceeding. They’re on the same harness as the PCM, and can cause faults if they fail. If there’s an issue with your TIPM or BCM, try troubleshooting those parts. These can mean there are deeper, underlying issues with your engine, so we want to rule those possibilities out first. Check your car for any ECM or TIPM/BCM trouble codes. If your battery is pushing anything less than 12 volts, try replacing it with a new one before you move on to anything more complex.īefore you start doing anything more complex, examine and additional error codes you might have encountered with the code reader. Your PCM requires a full charge to work properly. This may sound obvious, but check your voltage before you look at anything else. We’ll work through things methodically, to ensure that we’ve covered all of our bases before we decide that it’s actually time to replace our PCM.Īfter all, we don’t want to do that unless it’s absolutely necessary. Now that we know what could be causing our error, let’s go over how to diagnose the problem. So, we’ve got a fair bit of ground to cover before we decide to go ahead and replace our PCM. Before we move on to diagnosing anything, let’s look at our possible causes: Possible Causes of a U100 Codeīefore you determine if you need to replace your, you’ll want to look at other connected parts that may actually be to blame for your problem. It’s connected to dozens of sensors throughout your automobile, from your tire pressure to your air intake temperature. The PCM controls a wide variety of your car’s systems, including the air to fuel ratio, the engine timing, and the starter. – Your engine is delivering less power than usual for no apparent reason.Īll of these problems are related to the same cause: there’s an issue with your car’s Power Control Module (PCM).– Your fuel economy is dropping for no apparent reason.– Your car doesn’t start, or the starter doesn’t even turn over when the ignition key is turned.But there are other things that could indicate a U0100 code to appear as well. To begin with, there are the ones we already mentioned: a check engine light, or all of your car’s warning lights coming on at the same time. Symptoms of a U0100 Codeīefore we go any further, let’s look at the main symptoms of a U0100 code. We’re going to give you the rundown on how to fix U0100 code problems. Either way, you hook your car up to a code reader, and it’s showing a U0100 code. Or maybe a whole bunch of error signals have turned on at once. Common Causes of U0100 Code and How to Fix Them
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