The PCM is an integrated module that combines the functions of both the ECU and TCM (transmission control module). It oversees the engine and transmission systems, ensuring smooth coordination between the two for seamless performance. Check Engine Light: A persistent check engine light could indicate a malfunction within the ECU, PCM, or ECM. Poor Fuel Efficiency: If you notice a sudden drop in fuel efficiency, it may be a sign of a faulty control module. Rough Idling or OBD-II Complianc...

The PCM is an integrated module that combines the functions of both the ECU and TCM (transmission control module). It oversees the engine and transmission systems, ensuring smooth coordination between the two for seamless performance. Check Engine Light: A persistent check engine light could indicate a malfunction within the ECU, PCM, or ECM. Poor Fuel Efficiency: If you notice a sudden drop in fuel efficiency, it may be a sign of a faulty control module. Rough Idling or Stalling: Fluctua...