Skip the auto shop - Our mechanics make house calls

Q: What's the difference between the ECM and PCM?

asked by on

I have been told the brain or the computer for my truck is going bad. I'm trying to figure out what I need to do in order to fix it properly and nit take an arm and a leg.

My car has 169000 miles.
My car has an automatic transmission.

A: The engine control module (ECM) controls al...

The engine control module (ECM) controls all the engine functions to keep it running correctly monitoring all the sensors of the engine. The power train control module (PCM) will include multiple control modules in one case called a PCM. The PCM will include the ECM and one or more other control modules like anti-lock brakes, transmission, speed control, cooling fan controls, antithief and any other system the manufacture wants to include in the PCM housing. Your PCM is programmed to only work with your other control modules in your vehicle. Your vehicle will not start and run if your new PCM is not programmed by the proper programming scanner approved by the manufacturer. You may need to go to an approved service provider or dealer to have the new PCM programmed so your keys will start the truck. If you need to have a mechanic like one from YourMechanic diagnose the PCM to see if it is the cause of your problem you are having or there is another problem then make an appointment to have a mechanic come to you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Truck has trouble starting, idle's too low, losing power, check engine light is on.

You may want to try and run some combustion cleaner into the intake. You can get the good cleaner from any Ford parts store. You use a small rubber hose and allow it to get sucked into the engine slowly...

Q: Engine control modules replaced on a newer car

Hi there. These modules are common failures on the Jaguar XF. I am sure that this does not make you feel any better about it, but from my experience, once the modules are replaced you usually do not have any...

Q: Speedometer speed display problem, possible skipping

You will need to take it to the dealer for them to flash the engine control module (ECM) per technical bulletin 18-001-08. A reprogram is needed to correct the ECM programming for the proper cluster speed readings. You have to...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...