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Old 07-03-2012, 04:26 PM   #1 (permalink)
JohnnyM515
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Code PO087

08 LMM Duramax getting an intermittent code PO087 and no other codes but it flashes change fuel filter for about 15 seconds... Truck is totally stock except for a PPE standard programmer. Programmer was set on level 4 the whole time I have owned the truck and now I am getting this code once in awhile. Never had this problem before and I called PPE and they said to get a race bypass valve or a shim kit for the original bypass valve. Both times when the code appeared I was towing my 30 foot camper cruising down the road at about 65mph. The truck runs fine and it might not happen again for 200- 300 miles. I have not monitored the fuel pressure when it happens yet but I am going to leave the scanner on the truck and wait for it to happen again. Fuel filter has 2000 miles on it, factory GM filter. Any ideas?

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Old 07-04-2012, 11:00 AM   #2 (permalink)
Ron Nielson
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Johnny

There are lots of possible reasons/solutions why you may have a P0085 and no one reason/solution seems to be more common than another. Best thing for you to do is to search for threads with this error code and see what others have said. One thing that appears to be common is warm (hot) weather and pulling a load.

Not many people with lift pumps ever have this problem, but statistically, it is unknown whether this might be a solution for your problem. Personally, I use a $65 inline fuel pump just after my aux fuel filter and have never had this P0085 problem. Would I have had the P0085 problem without the aux filter or the inline pump? I'll never know.
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Old 07-04-2012, 11:33 AM   #3 (permalink)
jeepman380
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I get the "change fuel filter" every once in a while too. I've only had it throw a code twice though. I have an airdog lift pump with EFI live and it still will flash change fuel filter when i flog it pretty hard sometimes from a dead stop. I don't have a race valve or a shim kit so Idk if that's some of my problem. Never done the bottle test to see. My rail pressure never seems to drop below 23-24k though.
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Old 07-04-2012, 10:20 PM   #4 (permalink)
MRBASS
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Definitely a fuel pressure problem, most likely created by the tuner. You could fix it with a shim or race valve. Lift pump might be the easier solution though.

If you are using level 4 to tow with, you should expect bigger problems than a p0087 in the near future.
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Old 07-04-2012, 11:23 PM   #5 (permalink)
dmax3500
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return the truck to stock and drive it a while
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Old 07-08-2012, 07:54 AM   #6 (permalink)
dana h
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Quote:
Originally Posted by JohnnyM515 View Post
08 LMM Duramax getting an intermittent code PO087 and no other codes but it flashes change fuel filter for about 15 seconds... Truck is totally stock except for a PPE standard programmer. Programmer was set on level 4 the whole time I have owned the truck and now I am getting this code once in awhile. Never had this problem before and I called PPE and they said to get a race bypass valve or a shim kit for the original bypass valve. Both times when the code appeared I was towing my 30 foot camper cruising down the road at about 65mph. The truck runs fine and it might not happen again for 200- 300 miles. I have not monitored the fuel pressure when it happens yet but I am going to leave the scanner on the truck and wait for it to happen again. Fuel filter has 2000 miles on it, factory GM filter. Any ideas?
My truck had the same code. Goes into reduced engine power. I pull a 44 foot gooseneck race trailer. Took it to the dealer it was still under warranty they charge 190.00 to diagnosed cause GM doesnt pay for diagnostic time. They told me they had to change my aftermarket fuel filter first. They called me back and said # 6 injector was bad. And # 1 was going bad so they replaced it. Then they said one of the fuel rail hoses was bad and replaced that. That was 75.00 bucks plus shipping. That was less than a month ago. Went racing last night. Pulled the trailer truck had no power pulling hills replace fuel filter light came on less than 1000 miles. Called dealer and ask about it I told him the truck was running like shit. I told him the truck ran better before I brought it in. So truck is going back Monday. Will post what they come up with now
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Old 07-10-2012, 08:15 AM   #7 (permalink)
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Quote:
Originally Posted by dana h View Post
My truck had the same code. Goes into reduced engine power. I pull a 44 foot gooseneck race trailer. Took it to the dealer it was still under warranty they charge 190.00 to diagnosed cause GM doesnt pay for diagnostic time. They told me they had to change my aftermarket fuel filter first. They called me back and said # 6 injector was bad. And # 1 was going bad so they replaced it. Then they said one of the fuel rail hoses was bad and replaced that. That was 75.00 bucks plus shipping. That was less than a month ago. Went racing last night. Pulled the trailer truck had no power pulling hills replace fuel filter light came on less than 1000 miles. Called dealer and ask about it I told him the truck was running like shit. I told him the truck ran better before I brought it in. So truck is going back Monday. Will post what they come up with now

There's a TSB out there in reference to the fuel lines collapsing when hot and under load.Cheap fix.Here's what GM recommends:
http://www.industrialzone.com/parker-601-8.html
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Old 07-11-2012, 12:48 PM   #8 (permalink)
picsman2
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I have 08' purchased new--had this problem start at 70k mile--was running "bullydog powerpup at lowest setting...over the next 100,00 miles consistently got more frequent "change fuel filter"--went back to stock--I changed fuel tank, fuel lines, fuel filter housing, installed fuel pressure relief valve, started adding diesel treatment for bacteria-----last straw was towing pontoon boat up rte 81 to NY--EVERY HILL it would go from 100% fuel filter life to 0% and if you didnt reset it, truck would limp---took to dealer 2 times after this and truck wouldnt pull code (one without trailer, and 1 with 24' enclosed trailer)--it has to be fuel pump that is causing it to loose pressure--I've replaced everythig else. ---just changed injection pump--towing 30' flatbed to Virigina and will have 10,000lbs on it on the way back--we'll see what happens. By the way--the mechanic told me the "new" pump is bigger and they added something to it because this is an issue..
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Old 07-11-2012, 01:25 PM   #9 (permalink)
vtsquid
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Quote:
Originally Posted by picsman2 View Post
I have 08' purchased new--had this problem start at 70k mile--was running "bullydog powerpup at lowest setting...over the next 100,00 miles consistently got more frequent "change fuel filter"--went back to stock--I changed fuel tank, fuel lines, fuel filter housing, installed fuel pressure relief valve, started adding diesel treatment for bacteria-----last straw was towing pontoon boat up rte 81 to NY--EVERY HILL it would go from 100% fuel filter life to 0% and if you didnt reset it, truck would limp---took to dealer 2 times after this and truck wouldnt pull code (one without trailer, and 1 with 24' enclosed trailer)--it has to be fuel pump that is causing it to loose pressure--I've replaced everythig else. ---just changed injection pump--towing 30' flatbed to Virigina and will have 10,000lbs on it on the way back--we'll see what happens. By the way--the mechanic told me the "new" pump is bigger and they added something to it because this is an issue..

Do you have a part # for the "new" pump?
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Old 07-11-2012, 01:29 PM   #10 (permalink)
picsman2
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"97361351 PUMP" there is a bunch of gaskets and seals listed on the invoice also..
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