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Update... The Ford tech ran tests and checked everything. Looks like a bad PCM. They are ordering PCM and also changing crank case filter. Not cheap...but cheaper than a new rig. Next will consider fuel pump Update and Def delete (due to recent legislation). I also had truck in years ago...

Update...taking truck to a local Ford dealership next Thursday. Will explain situation again and show them Mattd's suggestions. Really hoping to get this resolved. Will update once I know more. Appreciate all the help. Thanks again @mattd. Have a great weekend all.

Appreciate it. Let me find another shop and arm them with this situation...maybe they can take a more targeted approach based on what is happening. The last tech said he checked all grounds and wires, etc. Don't know about exact diagnostics though. Either way, will keep everyone updated. No...

Just completed a 1,700 mile round trip (camping). Ford paperwork on the P1557 injector doesn't go over any tests, but says changed injector (not pigtail). New injector for P1557 and new injector and pigtail for P1555. After every start I either get P1555, or get both P1557 & P1555. Truck has...

Between the two places...I assumed they did. Planet Ford in Spring, TX (P1557 code) has a dedicated truck center...but I don't know. Shop tech said (non dealer - P1555) said he ran a bunch of tests and couldn't do one due to it being a Cab & Chassis. All was functioning good. When I get back...

Update...looks like new injector for P1557 is now showing code at every start up. So, P1555 and P1557 now show. I clear and drive. Engine runs smoothly, MPG is good and no smoke. Ford dealer told me bad and replaces (P1557) and they did a PCM refresh which I wonder if it causes the codes to...

Appreciate it. Will reclean battery connections to rule that out. I am hoping all that was done. I'll have to look into that to verify if cleaning batteries doesn't help. Will keep thread updated on this. Very much appreciated all.

Yes, an independent diesel shop.

Update to this thread. Had the injector and pigtail replaced for P1555. Got a bad injector replacement and replaced again. All runs good but after every shutdown and restart P1555 keeps coming on. Tech believes PCM is the problem. Truck runs fine and only presents check engine light upon...

Been using Archoil...not 100% but most of the time. Have used powerservice anti-gel a couple times when cold. Use OEM fuel filters. Try to get fuel at top tier but sometimes hard when traveling. Truck can sit for months but I usually drive it in between trips. Haven't noticed any engine...

Have a 2014 F550 6.7 Powerstroke on a motorhome platform. Have been changing fuel fiters, etc. diligently. Last repair, had injector #4 replaced...code was P1558. Fast forward 3,000+ miles later get another code P1555 which indicates injector #5. Truck has 47,000 miles on it. Should...

I returned some new jugs to Walmart before moving out of state. They checked the seals, etc. before accepting. That is terrible. Really embarrassing that folks do that.

Thank you sir...I went to a different website. My apologies and thanks again.

I cannot find 0w40 Super Car on HPL's website? Would be be interested in using it, especially in the hot Texas summers.

I've been running PUP 0W40 and finding deals on Amazon (unfortunately). Been doing UOAs switching back from NAPA and Blackstone. Here is a recent UOA from Blackstone. Running white filter (viper). How many miles on yours? Have fun with it.

Thank you sir. Probably mid size as will end up being driven by my son. Not against full size either. Heard similar things with Toyota. Appreciate the insights. Have a great day.

Looking to add a truck that will eventually be for my son to drive to school, etc. Considering new and used...new will be used when he is ready to drive. Due to Stellantis' issues and no Hemi...thinking of excluding RAM. Considering GM, Ford, and Nissan? Who has reliable proven platforms...

https://bobistheoilguy.com/forums/threads/rethinking-5w-40-vs-15w-40-for-my-low-use-diesels.346111/ @JHZR2, curious what you ended up doing with your low use diesels? I have a powerstroke 6.7 on a motorhome chassis, which isn't used daily. It can sit for months at a time (will usually drive...

Interesting. I run a ScanGuage II to track Regens and GPL (grams per liter) in the DPF filter. Been using Valvoline 5w40...haven't done a UOA in a while. Thanks for sharing.

Just had my water pump go bad on my 2018 Hellcat. 42,000 miles. Was covered under my extended warranty. No leaks just a groaning which I thought was supercharger at first. Sthescope confirmed water pump. Tech said pump movement was bad. All good now. Hoping it lasts longer than 42,000 miles.