The engine control module (ECM) or power train control module (PCM), is one of the most important components found in virtually all modern vehicles. It basically functions as the main computer for many of the engine performance and vehicle driving functions. The ECM takes the information from the various engine sensors and uses it to calculate and adjust the spark and engine fuel for maximum power and efficiency.

The ECM plays a crucial role in newer vehicles, where the ECM controls many of the essential functions of the car. When the ECM has a problem, it can cause all kinds of problems with the vehicle and, in some cases, even makes it impossible to drive. A defective ECM can produce any of the following 5 symptoms to alert the driver of a possible problem.

1.
Check that the engine light comes on

An illuminated Check Engine light is a possible symptom of a problem with the ECM. The Check Engine light generally illuminates when the computer detects a problem with any of its sensors or circuits. However, there are cases in which the ECM illuminates a Check Engine Light by mistake or when there is no problem present. Have a mechanic scan the computer for trouble codes to diagnose if the problem is related to the ECM or any other part of the vehicle.

2.
Engine stalled or misfired

Erratic engine behavior can also indicate a defective ECM. A faulty computer can cause the vehicle to stop or fail intermittently. The symptoms may appear and disappear and do not appear to have any type of pattern for their frequency or severity.

3.
Engine performance problems

Engine performance problems are another symptom of a possible problem with the ECM. If the ECM has a problem, it can divert the engine time and fuel settings, which can adversely affect performance. A faulty ECM can cause the vehicle to experience a reduction in fuel efficiency, power and acceleration.

4.
The car does not start

A bad ECM can lead to a vehicle that does not work or is difficult to start. If the ECM fails completely, it will leave the vehicle without engine management control and, as a result, will not start or operate. The engine can still start, but it cannot start without the vital inputs of the computer. Car starting problems are not caused exclusively by the ECM, so it is better to obtain a complete diagnosis by a professional technician to accurately determine the cause.

5.
Bad fuel economy

Bad fuel economy can occur due to a defective ECM. A faulty ECM does not let your engine know how much fuel will burn in the combustion process. In general, the vehicle consumes more fuel than it should in this situation. You will end up paying more for gas than you would pay with a functioning ECM.

LAST WORDS

The ECM plays a vital role in your engine execution. Any problem with it can cause major problems with the overall functionality of the car. As the computer systems found in modern vehicles are quite sophisticated and complicated, they can also be difficult to diagnose. For this reason, if you suspect that your vehicle's ECM has a problem, have a professional technician inspect the vehicle to determine if your car will need an ECM replacement.
Source:
http://www.eliancars.com/2019/10/5-indications-of-faulty-engine-control.html#more
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