Good evening.

I'm having a very recent issue with my 03 Excursion 6.0 shutting off while driving. It's happened a few times, but it always starts right back up. I connected Forscan to it and it is throwing an entire laundry list of codes related to electrical. Here is the list of codes:

• TCM: None
• PCM: P0113-E0
• PCM: P0118-60
• PCM: U0306-60
• OBDII: None
• PATS: None
• IC: B1318
• IC: P19139
• IC: U1073
• IC: B1360
• IC: B1352
• PAM: C1701
• OTC: B1203
• ECS: None
• GEM: P1876
• GEM: P1832
• GEM: B1318
• ABS: None

I have verified that the issue is not related to HPOP/ICP/IPR, as Forscan shows everything normal on that end, and the truck always cranks right back up after it shuts off. All of the injectors pass the buzz test and clattering sounds fine. Also, the FICM is a new, BPD 6-phase, and it shows 47-48.5 volts with no drop below that that I've been able to see thus far. I haven't been able to reproduce the shutting off issue while the live data is running yet, as it's very intermittent and runs perfectly fine most of the time. So my question is does this sound like it is a wiring issue, such as chafing, bad ground, or bad connector? If so, what is a common area of the harness I should look at that would throw all of these codes at once? To me, it seems very systemic, but the thing is, when engine shuts off, it does NOT shut off all of my electrical such as my radio, HVAC blowers, or dash panel. So it seems the short is related to something primarily under the hood.


List of DTC's from Forscan

 

I'm by no means a 6.0 expert, but I had this same issue with my 05 6.0 Excursion. I'd be driving along just fine, when the engine would just shut off. Just about the time I was looking for a place to pull off the road, it would start going again (no cranking necessary). Sometimes it would go 100 miles between events, and sometimes it would happen 5 times in 2 miles. After two months of picking the brains of the gurus here on the forum, and replacing sensors, jumpering wires, etc. I finally figured out that this is called a PCM reset, and in my case it was caused by a short in the wiring harness in the engine compartmant where years of rubbing had caused a wire to rub through and intermitantly short to ground. I ended up replacing both the main engine harness and the injector harness, and it completely fixed the problem. I nevr found out which one was the culpret tho. The injection harness was not too hard to replace, but the main engine harness was a challenge. The biggest headach was removing the AC compressor to access the crank position sensor wiring. I went ahead and replaced the crank and cam position sensors while I was there since it was bear to get to them.
Here's the whole discussion, if you have the time to read it all. (last time I looked there were 364 replies)
https://www.ford-trucks.com/forums/1...r-loss-25.html
Hope that helps....................Gary

 

Gary, thanks so much. That does help a lot and sounds very similar to my issue. There's no stuttering or stammering when it shuts off, it's just a clean, instant shut off. It hasn't cut itself back on as you describe, but that could be because I didn't give it a chance. When it happens, I pull over immediately and turn the key off, and then re-crank it. Thanks for the link, going to dive into it now.

 

Hope it helps. There is wealth of knowledge here on the forum, and I would have been completely lost without the help of the forum gurus.
They are a great resource.
Gary

 

And I still plan on finishing going over your old harness, Gary. I see it most days. I've been overwhelmed with so much else in my life that keeps piling on.

 

I wish I had spare "new" OEM engine harnesses (main and secondary)! This spare part obsession can get expensive!

 

Hey all, just wanted to post an update here. I got my truck back Friday and drove it all weekend. Couldn't get it to act up no matter how hard I tried. I didn't get a chance to speak to the mechanic in person Friday as I picked it up after hours, but I knew he changed both the CMP and the CKP sensors. Being still a little anxious, I spoke to him this morning and he told me that he found oil in the connector for the CKP sensor and that the CAM sensor was missing one of the bolts where it bolts into the block. So both of those issues are corrected and I am keeping my fingers crossed that this fixed it.

He didn't find any issues that stood out upon visual inspection of the harnesses, but since both of those sensors had issues, he decided to fix those, let me drive it, and see if it's corrected before we start spending hours of time/labor on testing the harnesses. Being that it was an intermittent issue makes a lot of sense. I put probably 300 miles on it over the weekend and it seems to be doing okay. I'll probably at my leisure continue to scope out the harness on my own looking for any chafing. If anything changes, I'll update this thread again.

Also, as far as the fan clutch code, there is no visible issue with the wiring...it's still all intact. The fan seems to be working properly as it should. I reset the code, and several drive cycles later, it did come back on...so there must still be something going on with it. Not sure what. Also, something new is my overhead clock light has dimmed out and is throwing a code. So I think I do still have some wiring issues somewhere. I might need to look real hard under the dash where my aftermarket VIPER remote start system is installed and make sure there isn't something jacked up under there.