I need some help with codes on a 2018 2.7 with 145k miles. On our way from Tennessee to Florida last week pulling a 25’ travel trailer, the truck quickly and multiple times cut out under hard acceleration such as pulling up a mountain. If I kept the rpm below 3000, it did this a lot less. It feels like a really rough shift/ jerking feeling, as power cuts out momentarily.

This has happened before years ago and I changed the plugs and cleaned the coil packs and boots and it resolved it for a while. It has happened 4 different times while I’ve owned the truck. I have the Motorcraft coil packs with the non replaceable boots, which were used for some of the 2018 model year trucks.

Back to the trip. We got to Florida, and as we were heading home, the truck stalled on acceleration from stop. It didn’t die, it just lost power. The check engine light came on and a low pressure fuel system fault code was present (P008A) as well as U0422. It happened again, and I called a dealership who diagnosed it as the fuel pump in the tank. 4 days later (part had to be ordered), and over $2100, I had my truck back. There were no misfire codes on the way to Florida, even though the truck was jerking/ cutting out under load on the highway.

The dealership said I was feeling the low pressure pump beginning to fail.

Coming back to Tennessee yesterday, the jerking was just as present as it was on the way to Florida. This time there are the codes shown, but no check engine light.

I did order a set of coil packs before the fuel pump was replaced which showed up when we were in Florida, but I assumed I would return them because I was told the failing fuel pump was the problem. Apparently there are a few issues.

Does this look like plug gaps, coil packs, injectors, Body control module or something else maybe?

battery is less than a year old.

Plugs are new within the past 15k miles. Motorcraft plugs from the dealership for my truck. Coil pack boots cleaned and dielectric grease between plug body and boots at the same time as plugs replaced.

 

Not a tech, but will try and help. Any notes on how they determined the pump itself was bad? Tech did this test and it failed, pump not priming when key cycled on, etc? Any live data notes from scanner (scan tool) with fuel pressure or other data?

Did the Fuel pressure Sensor get changed? I would think a bad sensor could start the chain of events your seeing.

You just monitor with the Lund I asssume? No tune on your truck?

 

Low fuel pressure code P 008A and misfire P 0316 first 1000 rpm on starting go together.
Use a Scanner and look at Live data for low or high side fuel pressure.
It has to feed the high side fuel pump or there is trouble.
Plugs and Coils can't fire low or no fuel. These are not these the cause, but Plugs could contribute if the fuel was too >Lean< for too long, under the conditions you Tow at.
.
U 0422 is a Body Control Module code for some power issue. May or may not be part of the problem but has to still be considered separately for that possibility.
Good luck.

 

Blue and I are thinking the same I believe. If it were me I would run down that P008A code first. As Blue said not enough fuel.....misfire. Lack of fuel and misfire could also cause your BCM code as well.

Couple easy and free checks. I would do a battery health check & full charge as well. Check battery Amp draw, another free and quick check if you have a multimeter. BCMs are very sensitive to a drop in voltage.

 

they did a pressure test, and the low pressure pump was not reaching specification pressure. They also did a battery health check and it passed.

no tune, just using the gauge to check codes when something like this happens. I used to have a tune but they discontinued the NGauge and do not support it any longer. No live data but I can do that.

the tech did a fuel pressure test from low pressure pump and it failed. I do plan on removing and inspecting plugs. I noticed a very slightly rougher idle than normal almost from the first day after I changed the plugs.

The P008A code was cleared when the pump was replaced and hasn’t come back. Battery health was checked at the dealership and passed. I’ll definitely do an amp draw check.

 

Turbo engines are much more critical for maintenance under a lot of Boost where combustion pressure is very high.
Can't get that much power from a small engine without accepting this.
What is coming from 2027 and later is quite different than the present.
Total re-design of the 5L and offering of the smaller engines and even changes in the 10R80 Trans and shifting control.
Good luck.

 

Assuming the pump they installed is good, new does not always mean good even OEM. Post install, pressure with new pump checked good and "fix" verified? Not its new your good, pressure is now XXX with new pump and within spec. Info should be on invoices. If yes, move to Sensor. Any notes on invoices that sensor was checked and good? Live data or multimeter I believe can check to make sure it is good. Again, not familiar with 2.7 as we ran 3.5's.

Hard to narrow it without live data and our shop guy (learned a ton from him). Hope this helps. Will be anxious to hear the cause and fix.

 

Craig did you get your problem sorted? Curious what the issue was.