ECM vs PCM.

[Blaine Miles]

So I have a 2020 Ram Rebel I purchased a while back. I bought it used with the remainder of factory warranty. That warranty is passed and now I'm getting a misfire on cylinder 6. Through process of elimination I believe it's issue is coming from the control. What I don't know is, is it the PCM or the ECM that controls firing sequence?
Note* I'm clearly not a mechanic but just looking for some help figuring this out.

 

[ekaz]

PCM and ECM same thing, just depends on who you talk to and it can vary brand to brand. That said, PCM is what controls the firing. Before replacing the PCM, have you tried moving the ignition coil to a different cylinder to see if the code moves with it? Check the spark plugs, etc? I would go through all the easy stuff before looking at the PCM right away

 

[Blaine Miles]

Yessir, moved the coil and spark plug. The wire ohms out correctly as well. Still reported the misfire on cylinder 6.

 

[Cbty2050]

Did you move your fuel injector?

 

[Cbty2050]

Next question, how many miles are on it?

 

[kapinallinen2]

Yessir, moved the coil and spark plug. The wire ohms out correctly as well. Still reported the misfire on cylinder 6.

Could also be caused by a leaky or clogged up fuel injector.

 

[Blaine Miles]

Next question, how many miles are on it?

47900

 

[Blaine Miles]

Could also be caused by a leaky or clogged up fuel injector.

Checked the injector... its good

 

[Cbty2050]

47900

Your PCM would be covered under emissions warranty. How did you check the injector? What is compression on cyl 6?

 

[kapinallinen2]

List of possible causes for misfire.