Powertrain Control Module. Under the hood, passenger side, bolted to the firewall. LOTS of wires going to it. Hard to miss.

 

Thank you very much guys.I need to get this truck running asap.I live in fl and my dad is dying of cancer outside of boston.I need to drive this truck to boston.He isn't going to last more than a week or so. Thank you Jack (dad is 88) I am 60 yrs old.

 

Hey you thank you so much for such a fast response.I am getting dressed and going out side right now.Thank you Jack

 

Being a Cummins the only thing the computer controls is the grid heaters. So they will run without the PCM they just lose everything described. That being said, without signal from the crank sensor the PCM does not know it needs to start working to do all those things. I will put money on crank sensor or even improper air gap. It is on the front of the engine reading off two notches on the damper. Like I said, check that it has .020" gap. If it does then I would suspect a faulty sensor.

 

blackskyracing I there a way to test the crank sensor before I spend 114 bucks at napa for one.Thank you Jack

 

Crank sensor is hard to test if motor does not run. Get a Standard Motor Products brand from rock auto and use the discount code in the general discussion section. I highly doubt it will be the $114 rip off from NAPA.

 

Cummins 12 valve engines don't need anything computer related to run. The crank sensor is also very expensive... That being said, the only things you can do is check connections on the front of the head, check the air gap, and check for the reference voltage (can't remember if it's 5, 8, or 12 volt). If those are all good then it's bad.

 

jacksnooky Please add all the info about your truck to your sig and profile please. Thanks

 

Thank you I will check the voltage .the air gap is fine.I gues I will just buy one.This motor is very clean.All connections are free from carosion.Thanks again. Jack

 

My ram 250 cummins turbo.Is still running without tach,speedo,overdrive or auto shifting.I replaced the crank sensor and cleaned all the conections on the pcm.WHAT ELSE COULD IT BE thank you Jack