The PCM (Power train Control Module) is the most complex component of the vehicle. It receives information from a variety of sensors. The PCM monitors both systems Engine Control Module (ECM) and Transmission Control Module (TCM); the PCM collects information from these components and analyze information to control fuel injectors, ignition system and more. The system works out the best setting for peak performance and adapts accordingly. If you have a bad PCM, you can face serious issues; in this article we discuss some common symptoms which help you to diagnose a fault in the PCM.
When something bad happens with PCM, it could misinterpret the fuel/ air ratio in a mixture like an injector will become failed to send the right amount of fuel in the combustion chamber. If there is less fuel in the mixture then the engine will not function properly and work under power which will further cause jerking and stalling. If this state remains for a long period of time then the engine becomes damaged permanently due to the not getting lubrication to the moving parts. If there is rich fuel mixture goes to the engine it will not cause damage the engine directly but it decreases the fuel economy and also further cause too much carbon emission and adverse effect on the performance of the engine.
If your vehicle starts shifting without any reason, it is a clear indication that something bad happens with the TCM and PCM. But it also indicates an issue with transmission valve or low transmission fluid.
If the engine does backfire or misfires a lot, then you probably need to take your vehicle to the mechanic. The mechanic can use the diagnostic tool to analyze the code of code and tell you the kind of the problem.
For the normal functioning of the engine, the PCM makes sure that everything is working in the correct position. I also aid in the correct timing of the ignition. If the timing is not correct, the spark plugs are unable to ignite at the correct time.
The burning of more fuel in the combustion chamber increases the volume of emission gases. The catalytic converter purifies the exhaust gases to some extend but too much-unburned fuel in the emission causes a higher volume of carbon dioxide therefore you might be able to fail an emission test.
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