The more screwed up your PCM is, the more likely you’ll have multiple issues leading to poor performance. Your PCM controls performance, so it makes sense that if it’s not responding correctly, performance will suffer. Check the trouble codes with an OBD2 scanner 2. If your vehicle has a check engine light, rule out every other possible cause before jumping to the PCM. Just keep in mind that the problem is more likely with the sensor, wiring, or just about anything else. The light could be for anything related to the powertrain. The first sign that your PCM is having issues is likely going to be a check engine light. Here is a more detailed list of the signs of a bad or failing powertrain control module to look for: 1. Before you jump straight to the PCM, though, rule out any other potential causes. While it’s not common for a PCM to break, it does happen from time to time. Poor fuel economy and increased emissions are also quite common. You may also notice problems with the transmission, like shifting issues. The most common symptoms of a bad PCM are poor engine performance and a check engine light on your dashboard. What is the difference between an ECM and a PCM? Symptoms Of A Bad Powertrain Control Module (PCM)
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