2019 Ford F250 6.7L 5V REF Intermittent Issue

I have a 2019 F250 6.7 with 27,000 miles. It has an intermittent issue that seems to stem from the 5V REF harness somewhere. For the last 10,000 miles, it will randomly fall on its face while driving. It will still run, but it is extremely sluggish, feels like driving with no turbo. 

It dings, illuminates the CEL, and then on the instrument cluster come up with "Hill Assist Not Available", and "Service AdvanceTrac", "Service Traction Control" and/or "Traction Control Not Available", 
The boost gauge shows maxed out, exhaust brake won't function, and on the scanner it shows the throttle position at 100%, and the Exhaust Manifold Pressure at 0PSI. 
When you go to start the truck it has an extended crank as if it isn't going to start, and then fires up. 

The following mix of codes will be present during the malfunction;
P06A7    PCM Unknown definition
P0107    PCM - Manifold Absolute Pressure Sens Circ Low
P0473    PCM- Exhaust Pressure Sens 1 High
P0343    ESS Volt Supply High

P01C6     Fuel Press Sens A Circ High
P06A7     Sens Reference Voltage B Circ Range/Perf
P0471     Exhaust Press Sens A Circ Intermittent/Erratic
P0107     Manifold Absolute Press/Barometric Press Sens Circ Low
P0473     Exhaust Press Sens A Circ High
P0341     Camshaft Pos Sens A Circ Range/Perf Bank 1 or Single Sens
P0343     Camshaft Pos Sens A Circ High Bank 1 or Single Sens

I took the truck to Moon Twsp Ford, they have a designated diesel department and it was there for 4 months. The tech couldn't duplicate the issue, so I told him to drive back and forth to work every day. He claims he tested all the sensors/wires with no issue. Basically wait until it gets worse before it can get better. Well it didn't do it for a year after I picked it up, and then I was pulling a trailer with a Ram 1500 on it back to PA from NC and about 2 hours from home it started acting up, it still pulled the trailer but it would be almost floored going up hills. 

When it happens, I can clear the codes and it fires up fine every time, but as soon as I start to drive it it comes back almost immediately going down the road. You can do this 20 times and it happens every time. But when it goes away, it just goes away. I can run the piss out of the truck and nothing happens, but then randomly some day i'll be pulling into the parking lot at work or merging on the highway and get on the gas a little bit and bam, it falls on its face and all the lights come on. I hate knowing that at any given point it can just quit. 

I purchased a OEM Ford wiring book and that's how I determined that most of the codes are for sensors that are all on the 5V REF. But that's about the extent of my ability. I recently purchased a Snap-On scanner to carry around with me waiting for it to happen again. Hopefully I can figure out how to use the scanner in the meantime. 

Any input is appreciated, thank you!


 

This sounds very similar to another thread we saw about six months ago. Check it out below. TONS of good information in there:

www.scannerdanner.com/forum/post-your-re...iple-pcms-fixed.html

All of those sensor codes are directly related to one specific 5V regulator in the PCM. That regulator feeds the bank one cam sensor, MAP, exhaust backpressure, EGR, fuel pressure/temperature and (as it turns out) the reductant pressure sensor. Any of those sensors or their reference feeds are suspect.

It's a long list of suspects! But you can work through this. If it's me, I'm gonna start with a careful visual of the suspect sensors and the wiring harness. Look for rodent damage, recent repairs or any other evidence that someone has been monkeying around. Missing harness retainers, new electrical tape, like that. This new, with low mileage, any issues should stand out like a sore thumb.

Keep your initial inspection VISUAL ONLY. Don't go shaking harnesses or unplugging stuff right away. If you insist on shaking the harness, at least have the scan tool connected and within reach. That way, if you happen to shake the right harness and cause the problem, you might see it on the scan tool.

Don't forget about the reductant tank wiring, which you won't be able to see easily. If you catch the problem happening, an easy way to eliminate the tank and wiring would be to unplug C314: