SES LIGHT,LOSS OF POWER AND ROUGH ENGINE

[metx]

This is an '01 F250 w/7.3 PS and auto trans with 116,000 miles.
At work today I jumped in my truck to go to the store and a couple miles down the road I noticed loss of power ,roughness and looked down and the SES light was on. I limped back to work and parked it . Checked the oil and visual and see nothing wrong. I went out and started it about 2 hrs later and the light was off. So I drove it a few miles and it seemed to be ok.So I parked it back at work. Finished the day and hopped in to go home. Cranked it up and the SES light came back on. Ran bad all the way home.
I have a generic type OBII code reader and it shows no error codes when I hook it up. Should'nt there be a code stored with the light on? Or is there a special reader or scanner needed on the Powerstroke engine?
Can anybody give me an idea what they think the problem might be?
Thanks

 

[DaveBen]

You need a scanner that will read CAN code format. Auno Xray is one company and Autoenginuity is another that read our trucks. I have an AutoXray 3000 and I like it.

Dave

 

[metx]

I got an Autoenginuity on the way. I think I found the problem. Just need to get a plan on how to fix it. I am sure it is in the injector harness on the left valve cover. When i wiggle it while engine is running the idle smooths out and then will stumble so i am sure it is either on top or maybe inside the valvecover.
thanks

 

[metx]

It was the UVC harness come loose. I did my first "diesel mechanic" job and it is fixed.