Reduced Power Wrench, Code P252f. ????? - Ford Powerstroke Diesel Forum
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Old 03-16-2014, 08:22 AM
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Unhappy Reduced Power Wrench, Code P252f. ?????

My 2008 F550 with 109k total miles has a replacement motor, turbos, and injectors all installed by Ford. It only has 5K miles on it but has went into reduced power mode 5 times since September 2013. It runs perfectly 99%of the time but keeps going into limp mode and showing code P252F, engine oil overfilled. It has also shown code PO292, engine overspeed once. I have had the oil changed 2x and DPF forcefully cleaned by ford. The compression and injectors check out excellent and the two different dealers cant find the problem. Any ideas? It has a 16ft box on the back and liftgate and is all stock.
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Old 03-16-2014, 09:50 AM
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Check your engine oil!!!!! It is probably about 12 quarts overfull on oil. Don't seat the dipstick ALL the way in, keep short-sticking it until you get an idea of how full it is. if it registers full on the dipstick, with the dipstick a couple inches out of the tube you know it was overfull. The HP fuel system is under the valve covers, and a leak will overfill the oil, and you'll start to suck in oil thru the intake. Disconnect the Lower CAC hose under the truck on the drivers side, and drain the oil from your CAC. Then you need to check for an internal fuel leak.

1 You'd have to pull both valve covers, and leave the fuel cooler connected, then run the truck and check for fuel leaking. It's easier if you add fluorescent dye to the secondary fuel filter bowl, and use a dye light.

2 Alternatively, you can drain the oil overnight, and leave the drain plug out. Then you turn the key in the on position and run the fuel pump, while checking to see if fuel comes out the the oil pan drain hole. You may need to spin the engine periodically, and could take a solid 15 minutes of pump run-time before you see a leak.

if it fails test 1, replace whatever is leaking ;p Fuel like is torqued to snug on both side, 100 INCH pounds, then an addition 60 degrees.

If it fails test 2, pull the cab/turbo and throw in a new injection pump, pump gasket/harness, and the small jumper harness
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Old 03-16-2014, 10:10 AM
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Thanks for the advice, that's a little to complicated for my minimal shade tree mechanic skills but I will pass it along to the dealership working on it now. It amazes me that none of them can find the problem. Its currently at Tommie Vaughn Ford in Houston.
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Old 03-20-2014, 07:10 AM
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still no answers from Ford
My truck has now been to three dealerships now and has currently been at Tommie Vaughn Ford for almost 2 weeks now. They have yet to give me any answers but just called me this morning requesting my permission to do a manual compression check. their service tech contacted ford directly and was denied coverage to do this testing which means I would be out of pocket another $450 just to do this testing. I have already spent around $1000 on this truck and have only put around five thousand miles on it. I don't know who to talk with it Ford to help get this resolved. any ideas?
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Old 03-20-2014, 11:12 AM
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Originally Posted by aggiect01 View Post
still no answers from Ford
My truck has now been to three dealerships now and has currently been at Tommie Vaughn Ford for almost 2 weeks now. They have yet to give me any answers but just called me this morning requesting my permission to do a manual compression check. their service tech contacted ford directly and was denied coverage to do this testing which means I would be out of pocket another $450 just to do this testing. I have already spent around $1000 on this truck and have only put around five thousand miles on it. I don't know who to talk with it Ford to help get this resolved. any ideas?

aggiect01,

We have been having the exact same issue for the past year. P0252f We have a 2008 F550 Bus 6.4L (Assembled by Kystal Bus, Brea, CA) We have been to 18 different Ford Dealers, truck shops, and mechanics across the United States with varying results. We have gone 2 oil changes with no code, and recently just threw it again after a oil/fuel filter change. We have replaced the oil pump, exhaust system (incl. dpf sensors, dpf, and piping all the way back), fuel cooler, reprogrammed the pcm, ecm, and sjb as well as other diag tests. All at our costs since FoMoCo refuses to accept responsibility. This is a reman engine bought and installed in CA as well due to the previous motor blowing up.

We have been about 300 miles since the last code and the dealer is attributing this one to using aftermarket fuel filters. They claim that the fuel filter was only half full which would cause the engine to go into Reduced Power Mode.

Respond to this thread or PM me. Maybe we can help each other.
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Old 03-20-2014, 11:28 AM
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I almost feel like I'm in the movie Groundhog Day or waiting for Ashton Kutcher to come out and say that I was punked. its the same story with every dealership, it starts out that they're willing to help and when they find out that they don't know what's wrong they get mad and give up or keep trying to charge me diagnostic fees. it's extremely sad and disappointing that Ford will not stand behind their product or dealer network. These vehicles are all stock and have had all required maintenance performed not some truck that is chipped and taken out on track days. I and many other people have had similar problems with ford standing behind the radiator problem on 08 through 2010 trucks with the 6.4. My last 08 was on its third radiator and leaking at 80000 miles. if you come across a solution please let me know anf I will do the same. If not, this will be the last Ford that I or my family will ever purchase
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Old 03-20-2014, 11:46 AM
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No kidding. This has been absolutely ridiculous. The worst part is that our company has been purchasing Ford trucks/buses for going on Ten years now, most recently a 2004 F350 6.0, 2005 F350 6.0, 2006 F550 6.0, 2008 F550 6.4, and a 2011 F350 6.7, and they still don't seem to care. They never fixed the issues with the 6.0's, which, as most people know, the only way to make them reliable is to delete the EGR & cooler (illegal in most states) and put ARP headstuds in (which Ford doesn't recommend for some odd reason...). SO, needless to say, I have lost all confidence in FoMoCo mechanics and the integrity of FoMoCo as they refuse to accept responsibility for their own mistakes, even with consumers who are loyal. For a background, my uncle is a FoMoCo master mechanic of 20 years and my family has always been a Ford family (until recent years).
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Old 03-20-2014, 03:40 PM
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What kind of reman motor was it? Short block, long block, or complete ? If the turbo has black paint all over it, and the reman is less than 2 years old, then it is under a spw warranty coverage. If the engine oil was overfull, it could aerate and suck oil into the intake, egts skyrocket and motor can be damaged. If they want to do a manual compression test and it fail, then you also have a base engine concern cause by a fuel leak inside the engine. The repair and diagnostics should be at no cost. So if they ask 450 $(double what we charge at the ford dealer I work for) for a compression test and then they tell ya u need a cyldinder head or engine or a teardown, then u bring in ur receipt for your new reman engine you just got, u shouldnt have to pay for that compression test at that point. did contact ford motor company yourself? Because the dealers are different than ford motor co.. also, if fomoco thinks the problem was caused by poor workmanship, fomoco will not pay, instead the dealer that performed the work is responsible
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Old 03-20-2014, 04:30 PM
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Originally Posted by Scumbag View Post
What kind of reman motor was it? Short block, long block, or complete ? If the turbo has black paint all over it, and the reman is less than 2 years old, then it is under a spw warranty coverage. If the engine oil was overfull, it could aerate and suck oil into the intake, egts skyrocket and motor can be damaged. If they want to do a manual compression test and it fail, then you also have a base engine concern cause by a fuel leak inside the engine. The repair and diagnostics should be at no cost. So if they ask 450 $(double what we charge at the ford dealer I work for) for a compression test and then they tell ya u need a cyldinder head or engine or a teardown, then u bring in ur receipt for your new reman engine you just got, u shouldnt have to pay for that compression test at that point. did contact ford motor company yourself? Because the dealers are different than ford motor co.. also, if fomoco thinks the problem was caused by poor workmanship, fomoco will not pay, instead the dealer that performed the work is responsible
Complete reman ordered directly from-and-through Ford. It was replaced in Feb 2013 in Valencia, CA at Power Ford. As stated before, we have been to 18 different dealers across the US; they have worked directly with FoMoCo engineers; we have opened a case with them (which was recently closed); we have been in direct contact with a FoMoCo regarding the situation and they had us leave the F550 at a dealer in the Birmingham, AL area they performed tests and diag (at our cost).In all of the times that we have taken it in for the 252 code, only once was the oil high on the dip stick. They are not honoring the spw warranty and cannot find anything "wrong" as there are no "failed" parts, therefore there is nothing "wrong" and thus not the company's fault. Never once has there been the mention of "poor workmanship".
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Old 03-28-2014, 01:29 PM
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I just spoke to the service guy at Tommie Vaughn Ford and they did a manual compression test on my truck and found that the cylinders were all between 340-350 psi. I was told by him that normal pressure is above 400 psi. He also said that when they removed the lower air charger system that they found some oil in it (from blow by) which would cause more frequent regens and too much unburned fuel in the system. The cause according to their best guess is injestion of dust or foreign material into the motor causing dusting. Basically the same verdict as Joe Myers Ford said therefore FoMoCo will not cover anything under the 2 year warranty. His only recommendations were to either get rid of the truck or replace the motor again. Does anybody have any other suggestions? Remember, this motor has only 7,000 miles on it and has been driven 95% on the highway in Houston. I disagree with their reasoning for the low compression however it is my work against theirs and I know from experience who FoMoCo is going to believe. *** I hope that others learn from my very costly mistake not to trust Ford with their hard earned money and expect them to honor the truck/motor warranty.
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engine code p252f, limp mode, reduced power, warranty

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