The powertrain control module (PCM) is vital for managing a car's engine and transmission data from various sensors. A failing PCM can lead to issues such as improper shifting, increased emissions, engine misfires, and operational problems, necessitating a mechanic's evaluation. Warning lights on the dashboard indicate the PCM's communication issues with other systems in the vehicle.

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/