Check engine light illuminates Engine misfires or rough idling Decreased fuel efficiency Transmission shifting problems Difficulty starting the vehicle If you notice any of these signs, it’s crucial to have your ECU, PCM, or ECM diagnosed by a professional to determine the appropriate course of action. Check engine light illuminating Engine performance issues Poor fuel efficiency Irregular idling or stalling Difficulty starting the car Importance of Proper ECU, PCM, or ECM Functioning Ensuring the proper functioning of your ECU, PCM, or ECM is essential for maintaining your car’s performance, reliability, and longevity. Neglecting these components can lead to costly repairs, …