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・Fair and transparent pricing

Get a quote

What others are asking

Q: Where is the block heater cord located

The block heater connection if equipped is behind the front Ford emblem. Just flip it toward the passenger side to open the power port.

Q: can I use the positive and negative posts under the hood to maintain power to the computer while replacing main battery

If the two posts are indeed specified for jump starting, then the answer is "yes" you can safely install a 12 volt car battery there at the remote posts while you remove and replace the permanent car battery. Electrically, all...

Q: 4l80e transmission in limp mode

Hello and thanks for your question. When changing out the transmission and ECM from another vehicle to your vehicle with the same year and model can effect many things. Check all plug to ensure that everything on the transmission is...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...