Looking for some guidance from my fellow 6.0ers. I have an 05 Excursion and I drove and parked it, no problem. Came back out and the trouble began. I looked on this site (always do for the best guidance and info) and replaced the trans position sensor, put tunes back to stock. Since then, I have had intermittent issues with the truck only starting with the code reader plugged in, idle jump to 750 rpm, and the tow/haul light flash and won't shift into OD. It also seems at full stops it is not in the low gear. I am driving it to the "stealership" today to have the computer flashed. Additionally, the blinkers won't flash, they only illuminate. All this started at once. Any other guidance or suggestions out there?? Anyone know where all the ground straps/wires are?? Thanks everyone.

 

With so many issues, I'd start by looking for open harness grounds.
One eyelet off its stud or just loose can cause a host of symptoms.

 

The first thing that comes to mind for me this time of year is rodent damage to the wiring harness or as mentioned above, some kind of harness damage. I think you're wasting your time taking it to the DEALERSHIP to get it flashed. Have you tried having the PCM read for codes?

 

The very first time it gave me P0341 Cam position sensor, P0674 (I knew about that one already), P2285 Injector Control Pressure (changed it after it his code came up), it also threw the trans position code at one point (dropped the pan and changed that as well). The truck will be acting up and I will plug in the reader and it shows no codes. However it me remains running with the issues. After posting and starting my 2 hour drive to the dealer, I decided against it at this point. I plan to look over all the wiring and check all the grounds first. One the attempted drive up the truck did perfectly fine. The only thing that rips still acting up is the blinkers (hopefully unrelated). I will continue to work on it as house chores and work permit. I appreciate all the assistance and ideas. Thanks again.

 

Update, after starting the drive to the dealer, I decided against it only a few miles down the road. It has been a few days and I started looking for possible issues with grounds. I still haven't found anything specific. I did notice that when the code reader is plugged in and running live data, the RPM is not changing. However the tach and engine are responding. Is this an indicator if the potential culprit?? Is there a component I can troubleshoot and confirm or dismiss?? Thanks guys.

 

All the dash lights come on.
What the terminating resister value when it happens

 

I know of four grounding points, there could be more.

Two are next to the ESOF Solenoid (if 4Wd), passenger side, by battery on inside of fender well. Follow negative wire down, you'll see it grounded to frame, then keep following it back, grounded to engine next to starter. Hope that helps.