So is engine misfiring, like backfires or frequent stuttering. Depending on the exact nature of the issue, this can be as mild as a sudden drop in gas mileage, or as serious as your call stalling on the road, or failing to start at all.Ībrupt or unnecessary shifting is another sign that your PCM is starting to fail. You may have problems with your Transmission Control Module (TCM), which is the part of the PCM that controls – surprise! – your transmission. If this happens, there’s either something causing your sensors to fail, you’re your PCM is faulty. For example, you may keep getting O 2 sensor errors, replacing your O 2 sensors, and getting the same errors again days later. In addition to these codes, you may be getting other check engine codes that return after repairs.
P0605 – Internal Control Module Read Only Memory (ROM) Error.P0604 – Internal Control Module Random Access Memory (RAM) Error.P0603 – Internal Control Module Keep Alive Memory (KAM) Error.P0602 – Control Module Programming Error.P0601 – Internal Control Module Memory Check Sum Error.Otherwise, you may discover them after a trip to the mechanic. If your state requires vehicle inspections, these may come up during that time. How do you know if a circuit board is acting up? We’ve explored common PCM failures before, but let’s do a quick recap.įirst off, there are error codes that indicate a faulty PCM. You can see if they’re broken, and easily observe when they’re malfunctioning. Brake calipers and tie rods are physical parts. Many people find electric vehicle parts confusing.
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How to Know if You Need a PCM Replacement Beyond that, if you want to change your vehicle’s gear shift ratio, you’ll need to buy a new PCM. Auto manufacturers don’t want people changing their PCM settings, because badly-done tweaks could cause crashes and leave them liable for damages.įactory PCMs can indeed be flashed, but only to restore them to factory settings in the event that they’ve become corrected. If someone tries to sell you this service, they’re lying. Some people claim to be able to reprogram your PCM for the track, at a fraction of the cost of buying a replacement. One thing to be aware of is your everyday shady mechanic. If you know what you’re doing and you want to change your automatic transmission’s gear shift pattern, there are plenty of PCMs out there that will get you more acceleration on the racetrack. The exception to this rule is the hardcore auto enthusiast who wants to tweak their car for improved performance. For the average person, using the OEM standard replacement is recommended, since it’s guaranteed to work properly with your vehicle and won’t void your warranty. If you’re not sure, you can find your PCM’s OEM replacement part number on the PCM itself, or in your manufacturer’s catalog. Even different versions of the same model can have different transmission ratios, meaning that it’s extremely important to make sure your PCM replacement is right for your vehicle. What to Look For in a PCM ReplacementĮvery model of vehicle has different needs. Here’s our complete guide to diagnosing a broken PCM, choosing a replacement, and getting one installed. Unless you’re driving a classic car, your car has a PCM under the hood. PCMs were far more efficient than older, mechanical, flywheel-based automatic transmissions, and took over the entire market by the mid-1980s. They did this by monitoring signals from the vehicle speed sensor (VSS), throttle position sensor (TPS) and wheel speed sensor (WSS).īy using this data, they could shift intelligently, taking into account not only the engine’s RPMs, but also speed, torque, and whether or not the wheels are spinning (if the WSS data is faster than the VSS) or locking up (if the WSS is reporting speeds slower than the VSS). They were originally designed only to manage the powertrain and gear shifting. PCMs were first used in the late 1970s in performance cars. It monitors more than 100 functions on your car, from your automatic transmission to your O 2 sensors to your engine pressure. If you’ve ever gotten a low oil warning, or your check engine light or traction control light have come on, your PCM is behind that warning.
The power control module, or PCM, is the brain of your car.
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