In automobile’s functionalism, PCM acts as a central computer system. PCM is a key component that plays a key role in kicking off and keeping the engine performable. When it fails, the car may not run at all. A poorly running engine, starting problems, instant loss of gas mileage, stalling engine, random shifting- are the common signs of a bad PCM. From my stance, you need to be aware of the symptoms of a faulty PCM, so that you can fix the module before the extremity leads to disarray.

2. Powertrain control module(PCM)
receives data from a range of sensors.

3. ECM and TCM in your car are
generally handled by the PCM
monitors.

4. PCM analyze the collected data and
use that information to control:

7. If your car has a failed PCM, then you
will expect some serious issues.

8. Below points define the signs of failed
PCM in your car.

9. If the car starts shifting unnecessarily,
then it indicates the issues in:

12. Also indicates problems with the
transmission valve body or low fluid.

13. When PCM is failing, your car
mechanism is going to make errors.

14. Misinterpret the air/fuel mixture and
cause several issues like:

20. Downside of burning more fuel is that
car emissions increase.

21. Failed PCM will increase the
emissions and failed an emission test.

22. If the engine misfires a lot, then take
your car to the mechanic.

23. Mechanic can analyze the error does
and determine the problem.

24. PCM ensures that everything is in the
correct position in the car.

25. Co-ordinates with the ignition timing,
if the timing is off, then:
 Spark plugs won't ignite at the right time
 Leads to the problem while running the car
 Car may crank over. But won’t start

26. Illuminated warning lights are a sure
indication of trouble on the horizon.

27. Car is not operating optimally and
has a problem between different
systems.

28. http://euroautomotive.net/