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In case of the opposite, the engine will choke, stutter, and stall sometimes. When the engine gets more, the carbon emission increases and fuel economy drops. Source: advanceautopartsĪ trouble with the PCM means it cannot determine the correct fuel mixture and sends the engine either more or less fuel than it requires.

The module analyses the data and adjusts the fuel mixture accordingly. Various engine components and sensors send the PCM data about the functions of the engine. The PCM is the brain behind the operation and regulation of the fuel system. Knowing the bad PCM symptoms helps to spot the troubling point and seek a solution. Any issue with it will cause major problems with the running of the vehicle. The PCM makes the engine and transmission work in tandem. The car manifests the powertrain control module symptoms with various erratic behaviors. What are the symptoms of a bad PCM and what are the factors that cause these issues? Bad PCM Symptoms to be Aware of If you are aware of the bad PCM symptoms, it is possible to fix the module before everything leads to disarray. Having such enormous importance in the operation of all the parts means that an issue with it will affect almost every aspect of a car. It is in charge of all the components and their functions. The powertrain control module (PCM) works as the central computer system in a vehicle’s mechanism.