Hello all, can someone point me in the right direction if a post was already made on DIY for the engine control module (ECM).
I have a 2004 XLT 5.4l with a engine light on for O2 sensors. after replacing the O2 sensors the light remained on and couldnt figure out what the problem was. Took it down to a ford dealer to have them look at it. after they inspected the vehicle for several hours i was told i had a faulty ECM by one guy and i had a faulty PCM by another. I am not sure if they are the same thing. They told me they didn't carry the part anymore because its an obsolete part. they also said it wasnt important and that i didnt need to replace it. they did give me the part number and told me to find the part online and come back for the installation. before i order the part though i want to see if its easy to replace myself. any advice would be much appreciated fellow Ex brothers and sisters

oh the part number i was given was 4C7Z12A650HC

 

ECM and PCM are interchangeable terminology, it's the control module for your engine/powertrain (hence Ecm or Pcm).

Have you had the code cleared and it returns, or will it just not clear at all? For over $600 I personally would be highly tempted to just deal with it, it get either Torque Pro or a ScanGauge - both of which allow you to read and clear codes as well as monitor other engine parameters and help diagnose future issues. Also, neither one is even remotely close to $600+. My CEL comes on all every key cycle, but I need a delete pigtail for the EBPV which is out of stock. But I digress...

If you're set on changing the computer out, try giving Custom Auto's By Tim a call and see if they have one in stock. The may need your existing computer code to ensure you get a proper replacement, I don't know how you gassed guys work regarding that. I'm not affiliated with them, however I have had great luck sourcing obscure parts from them at fair prices.

 

yes i have cleared the code and it keeps returning. thats when i tried having the dealership look at it. they seem to be having a hard time with it and when i told them i had to go after about 4 hours they gave me the diagnosis the Pcm/Ecm was bad.
thanks for the advice. the torque pro looks really nice. i may have to invest in that.

 

They are guessing. Try a good independent shop. They often have techs that actually have to diagnose for a living. Ford dealers are getting too many parts changers.

 

roger that. i will have to yelp some local shops

 

Of course, if you posted your actual fault codes and specific symptoms here, you'll likely get some help....

There's not a whole lot in these systems that hasn't been discussed on this forum.

 

im actually glad you said that. when i took it to ford, i had one engine code showing which was 0059. when i just went out to go retrieve that code the scanner now shows 5 codes. 2195, 0053, 0059, 0135, and 0155. is it possible that something could of happened during the diagnostic that would cause more engine codes to pop up?