If any of these things start to happen, it’s a good idea to take your car to a mechanic and have them check to see if your engine is setting off any of the codes we listed above.įinally, you’ll want to determine why your PCM failed in the first place. 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.
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