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one of the most vital components in your
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car is the powertrain control module PCM
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the PCM has the responsibility to
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control the various parts and sensors of
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it ensures the proper supply of coolant
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engine oil and air fuel mixture this
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video deeply explains PCM function
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the PCM is known as the brain of the
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it is also known as the engine control
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it is a self-propelled control system
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installed in your car
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the main function of the PCM is to
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collect data from different parts and
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sensors of your vehicle engine
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after collecting the data it uses data
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to produce the desired power and
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efficiency of the vehicle by controlling
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the engine's Fuel and spark ignition
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it works efficiently when there is a
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proper flow of information from the PCM
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to the sensors and the sensors to the
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it controls about 100 plus functions of
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a car has several hundred trouble codes
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and every single of them indicates a
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problem in a specific part of the car
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foreign symptoms of a bad PCM
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usually the PCM is designed to last in
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your car for a lifetime but several
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different causes make it faulty
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as the powertrain control module goes
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bad it generates different symptoms
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one check engine light
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the check engine light is one of the
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major symptoms of a bad PCM or ECM
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however this light may illuminate due to
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many other problems in your car
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for example issues with wiring map
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sensor is sensor or engine overheating
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may also trigger a check engine light
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the best way to check whether it's a bad
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PCM or not is to use an OBD2 scanner to
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scan the trouble codes and find the
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2. reduced engine performance
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the bad performance of your car's engine
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can be the reason for a bad powertrain
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as the powertrain control module goes
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bad it doesn't properly control the fuel
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delivery in the spark timing
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when the fuel and Spark timing are
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Disturbed this results in poor engine
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3 issue and shifting gears
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a problem in gear shifting is also one
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of the common symptoms of PCM failure
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the PCM controls the functions of the
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transmission system in the engine of
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thus the issues with the powertrain
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control module will indirectly be the
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issues with your car's transmission
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4. issues in starting
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it is the job of the powertrain control
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module to ensure that every component it
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controls is working properly
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the ignition timing is one of these
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when the timing is off the spark plug
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doesn't ignite the air fuel mixture
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so with a bad PCM you will find it hard
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to start your vehicle
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furthermore starting your car in cold
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weather becomes even more difficult
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if your car often backfires or misfires
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then it needs a proper checkup by a
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in the service centers the professional
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will find the trouble codes and will let
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you know the exact issue with your car
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however misfires or backfires most
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commonly occur due to bad fuel supply or
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bad ignition in the combustion chamber
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6. failed emission test
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a healthy powertrain control module
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ensures the minimum emission of exhaust
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gases and improves engine performance
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however when the PCM goes bad it doesn't
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control the emission efficiently and
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increases the emission rate
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in such conditions your car performance
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a reduction in fuel economy is often a
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when the powertrain control module goes
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bad your car couldn't be able to detect
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exactly how much fuel it has to burn in
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the combustion procedure
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usually cars with a bad powertrain
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control module consume more fuel than
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cars with a properly functioning
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powertrain control module
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eight code errors related to PCM
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the bad PCM related trouble code is the
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a trouble code is created in your car's
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computer whenever a car faces an issue
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use a proper OBD2 scanner to read the
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code if the code is related to the PCM
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then you are lucky that you detected the
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poor quality control during the
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manufacturing process can result in a
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this can cause internal issues such as a
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broken circuit or a malfunctioning
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exposure to extreme temperatures
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moisture and vibrations can cause damage
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to the PCM leading to poor performance
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outdated or corrupted software can cause
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the PCM to function improperly
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this can often be resolved by updating
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the software or reflashing the PCM
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accidents collisions or other forms of
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physical damage can lead to a damaged
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this can cause broken circuits damaged
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components or a complete failure of the
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over time the components within the PCM
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can degrade leading to poor performance
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or failure this is often due to normal
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wear and tear but can be accelerated by
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the factors mentioned above
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voltage spikes or surges usually caused
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by a faulty alternator wiring issues or
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jump starting the vehicle incorrectly
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this can result in burnt or damaged
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circuits leading to a bad PCM
