![]() ![]() An illuminated Check Engine Light is one possible symptom of a problem with the ECM. What are the symptoms of a bad ECM on a car?Ī bad or failing ECM may produce any of the following 5 symptoms to alert the driver of a potential problem. However, most ECM problems are a result of a bug in the software itself. Oftentimes, these can be repaired by a skilled mechanic or electrician, by rectifying any shorts or bad connections. The first, and easiest, way to repair an ECM is if there’s a problem with the power supply. ![]() The symptoms may come and go, and may not appear to have any sort of pattern to their frequency or severity. A faulty computer may cause the vehicle to intermittently have issues such as stalling or misfires. Engine stalling or misfiring Another symptom of a bad or failing ECU is erratic engine behavior. ![]()
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