OBD Codes P0090 & P0087 - 2011 QX56

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MFL82

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Hi there, new on the forum. I have a 2011 QX56 with 115,900 miles. The check engine light came on and so I took it to AutoZone for a quick OBD scan. The codes came out as P0090 Fuel Pressure Regulator Control Circuit and P0087 Fuel Rail/System Pressure - Too Low.

The vehicle drives perfectly fine. It does hesitate to start after sitting for a day or two.

Anybody had these error codes?
 
the lamp would not come on for nothing, so if you think the car is running fine, it most likely is not.

the p0090 code is a fault with the high pressure regulator. this could be a faulty wire harness, sensor, or actual pump issue. it could be intermittent or it could cause issues if you "put your foot in the tank" or drive "spritely" :p

ther p0087 is a low pressure DTC. again could be a faulty wire harness or actual fault within the assembly.

i think the regulator is under the plastic engine cover on top of the motor. i don't know exact because ive never looked.

if you are handy with service manuals, you can get the service manual and have a lok see at the location.


a bit off topic, but did you ever get the timing chain recall done?
 
I’m going through this nightmare right now. 2011 qx56 with 140k miles purchased 3 months ago. Light came on 2 weeks ago and vehicle hesitates at hard take off and over 40mph. codes P0087 and P0090, I already changed the $400 in tank fuel pump, $1400 high pressure pump, checked wiring and connectors and codes return after second key cycle. Today I removed my ECM and and I’m sending it for repairs. I hope that fixes it.
 
marctronixx said:
the lamp would not come on for nothing, so if you think the car is running fine, it most likely is not.

the p0090 code is a fault with the high pressure regulator. this could be a faulty wire harness, sensor, or actual pump issue. it could be intermittent or it could cause issues if you "put your foot in the tank" or drive "spritely" :p

ther p0087 is a low pressure DTC. again could be a faulty wire harness or actual fault within the assembly.

i think the regulator is under the plastic engine cover on top of the motor. i don't know exact because ive never looked.

if you are handy with service manuals, you can get the service manual and have a lok see at the location.


a bit off topic, but did you ever get the timing chain recall done?
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Recently bought the vehicle so not sure if the timing chain recall issue was addressed.

Dante4602 said:
I’m going through this nightmare right now. 2011 qx56 with 140k miles purchased 3 months ago. Light came on 2 weeks ago and vehicle hesitates at hard take off and over 40mph. codes P0087 and P0090, I already changed the $400 in tank fuel pump, $1400 high pressure pump, checked wiring and connectors and codes return after second key cycle. Today I removed my ECM and and I’m sending it for repairs. I hope that fixes it.
Click to expand...

Please let me know if the recent repairs fix it and what you had to do.
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first order of business is to call into a local dealer , give them your vin and ask.

did you purchase from an infiniti dealer?
 
I bought my truck from an outside dealer with a 30 day warranty so pretty much I am on my own. I called an Infiniti dealer and my truck does not fall within the VIN range for the timing chain recall. I hope the issue I am having is not the timing chain because I will have to sell the QX56 and buy a Mongoose from toys r us before they go out of business. I sent my ECM out for repairs and expect it back in 6 days. I will let you know then if it fixes my headache.
 
Update: received my ECM back today they said it was a shorted resistor. Installed the ECM and after the 3rd key cycles the check engine light came back on again codes P0087 and P0090. I’ve change the two pumps, last low and high pressure and sent out the ECM for repairs, checked harness and connectors and all tested good $2300.00 in parts only and still have the same problem. I need HELP!!
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at some point it may be worth the cost to get the car diagnosed from infiniti. not sure if you have already done that..

what about the senses in the cats? they could be fouled...

still think you need to look into the timing chain recall. i could have sworn all 2011 were affected by this...
 
I called Infiniti consumer affairs 800 number, they confirmed that my VIN number does not fall within the recall. One of my first diagnosis was from Infiniti dealer and they recommended the low pressure pump which I replaced on my own. As you advised I will look into the timing chain by removing the high pressure pump looking for markings from a stretched chain. I will update tomorrow with the findings. Thank you.

Removed the high pressure pump again to double check and found the high pressure pump bucket worn and cracked causing low fuel pressure. Replaced the high pressure pump bucket $30.00 and reinstalled pump. Cleared codes so far the nightmare has ended.
 
Can you post a part number for this High pressure fuel bucket. I had a similar thing happen twice to me this year. it has been a month so far and it has not thrown a code again, but I just want to be pro active in fully getting this resolved.
 
I’m sorry I don’t have the part number anymore but the dealership called the the higher pressure pump bucket. But the light came back on today with the same codes. The bucket that I previously replaced is getting damaged again. The cam that actuates the high pressure pump is worn out and keeps damaging the so call bucket. Now I need to replace the eccentric cam lobe and timing chain cover. I found this post today https://m.facebook.com/a1stratemobile/posts/1096627593704661
Very helpful, I wished I would had found this before because It would had saved me a lot of money and time.

Infiniti dealer states that now I need an complete engine. Timing chain broke and bent the valves. Known issue with this vehicle model and year but Infiniti corporate does not want to cover it because my VIN number does not fall within the open recall Vehicles. And the nightmare continues... this went to hell really fast.
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Dante4602 said:
I called Infiniti consumer affairs 800 number, they confirmed that my VIN number does not fall within the recall. One of my first diagnosis was from Infiniti dealer and they recommended the low pressure pump which I replaced on my own. As you advised I will look into the timing chain by removing the high pressure pump looking for markings from a stretched chain. I will update tomorrow with the findings. Thank you.

Removed the high pressure pump again to double check and found the high pressure pump bucket worn and cracked causing low fuel pressure. Replaced the high pressure pump bucket $30.00 and reinstalled pump. Cleared codes so far the nightmare has ended.
Click to expand...

Guys,

Thanks for all of the information regarding tge PO090 & PO087 codes as I ran into the same thing with my 2011 M56 (5.6L) engine....after reading all of your posts I removed my intake and high pressure pump to find that the "lifter-valve" (bucket) underneath the high pressure pump had broken out the middle section and failed.The correct part number of the replacement part is Nissan 13231-1MC5E....it cost me $ 32.54 at Sewell Infiniti of North Houston in Texas. I am going to replace it tomorrow and let you know how it goes.
 
M56 Guy said:
Guys,

Thanks for all of the information regarding tge PO090 & PO087 codes as I ran into the same thing with my 2011 M56 (5.6L) engine....after reading all of your posts I removed my intake and high pressure pump to find that the "lifter-valve" (bucket) underneath the high pressure pump had broken out the middle section and failed.The correct part number of the replacement part is Nissan 13231-1MC5E....it cost me $ 32.54 at Sewell Infiniti of North Houston in Texas. I am going to replace it tomorrow and let you know how it goes.
Click to expand...
How did it go with the bucket replacement? I'm going through the same thing right now
 
I think you will have the replace the cam underneath the bucket also. Seems like a huge job given the timing chain drive the pump lifter!
 
G-193377 said:
How did it go with the bucket replacement? I'm going through the same thing right now
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I removed the intake, replaced high pressure pump (found a used one 12k miles for $ 850 on Ebay (they accepted my offer of $450 plus shipping from Florida to Houston), replaced fuel pump lifter-valve (bucket) from Infiniti $ 32..... replaced (new) all plugs and coils.....cleared codes....car started and ran, but code PO088 returned- fuel rail pressure too high...😥......I can hear the bucket grinding on the cam.....pulled off the high pressure fuel pump again and found wear on the bucket, then researched to find that the "high pressure fuel pump camshaft" should also be replaced at the same time.....I took M56 to my friend's shop and he quoted me. $ 250 to remove timing cover and replace "high pressure fuel pump camshaft", set timing and replace timing cover.....so, I sm searching for "high pressure fuel pump camshaft".
______________________________
 
I am going through this nightmare myself on a 2012 QX56. For sure that cam needs to be replaced as it will just grind down the bottom of the new lift bucket. However, getting the timing cover off is not a $250 job... The replacement cam alone is $300 new BUT the real challenge is the labor involved. You have to remove all engine from dress, drop the oil pan (which means removing the front axle and steering gear in a 4WD QX) and then you can actually remove the front cover. My situation turned worse as once i got into the engine I noticed the crankshaft seems to be binding and will not rotate freely and the bank 2 intake cam spins freely like the valves are bent and not keeping pressure on the cam. My current working theory is the fuel pump lift bucket disintegrated and broken pieces caused the timing chain to skip a tooth or two causing the bent valves. However, not sure how to confirm the bent values without pulling the heads and just a little too pissed to look at it right now... As to why the crank won't turnover by hand - other theories are welcome!
 
betzgb said:
I am going through this nightmare myself on a 2012 QX56. For sure that cam needs to be replaced as it will just grind down the bottom of the new lift bucket. However, getting the timing cover off is not a $250 job... The replacement cam alone is $300 new BUT the real challenge is the labor involved. You have to remove all engine from dress, drop the oil pan (which means removing the front axle and steering gear in a 4WD QX) and then you can actually remove the front cover. My situation turned worse as once i got into the engine I noticed the crankshaft seems to be binding and will not rotate freely and the bank 2 intake cam spins freely like the valves are bent and not keeping pressure on the cam. My current working theory is the fuel pump lift bucket disintegrated and broken pieces caused the timing chain to skip a tooth or two causing the bent valves. However, not sure how to confirm the bent values without pulling the heads and just a little too pissed to look at it right now... As to why the crank won't turnover by hand - other theories are welcome!
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Betzgb,

I actually replaced pretty much everything after opening the timing cover.....
I replaced the following:

Bank 2 Oil Jet - part# 13081-AR000
$ 14.74 (InfinitiPartsDeal.com)
The oil jet has a couple of Verrrry tiny holes on it that allow oil to be directed to the timing chain and upon inspection, were clogged, thus preventing oil to the chain. Replaced for less than $ 15

High pressure pump camshaft assy-
Infiniti part# 13020-5ZM0E
$ 298.87 (InfinitiPartsDeal.com)

Timing cover filter assy
Infiniti part# 15200-EY00A
$ 93.18 (Southwest Houston Infiniti)

Timing chain guide (broken "bucket" fragments broke (1) guide
Infiniti part# 13085-1LA2A
Clear Lake (Houston) Infiniti
$ 28.79

Oil Jet Removal and Install tools
Jig-Oil Timing Infiniti Part# 13081-1LA0B
$ 100.00 total to remove oil jet
Infiniti PartsDeal.com

I also replaced all of the O-rings for the timing cover (I think a total of 6 or 7) total cost from Infiniti $ 200.00 (they were in stock and readily available...if I had to do it again I would have ordered from InfinitiPartsDeal.com and waited the 2-3 days to receive them as it would have been less than $ 50

Unfortunately my timing cover was damaged at the top portion where the high pressure pump mounts. The broken lifter-valve "bucket" fragments gouged the inner walls where the "bucket" rides, therefore creating excessive wear on the bucket. I was able to find a used timing cover in Canada "Doug's Auto Parts gor $ 139.36 USD..... waiting 7 days to receive....better than the $ 700 plus new from Infiniti.

With your situation for labor costs and amount of damage and possible additional damage if I were in your situation I would simply replace engine for $ 4k..... check Car-Part.com for engine prices or eBay....Call Danny at Nissan Unlimited in Houston, (832) 467-4400, ask for Danny or William, he is great to work with as he has provided me with good parts and prices for years for my Q45, M45, Qx56 and now my M56.
 
Thanks for the rely. I went the exact same path as you, found the same damage in the timing cover wall where the lifter rides, and ordered 90% of my parts from InfinitiPartsDeal and OE Infiniti parts. Much cheaper than I could do locally. I decided to replace the chains "while I was in there" and that is where I began to suspect much more serious problems. For example, when I went to remove the crank pulley I noticed the engine was binding up and not rotating freely. Also, when I took the old chain off bank two I noticed the intake cam was rotating freely. I would have expected it to be difficult to turn due to upward pressure from the valve springs. Since you are in the same spot in the process as me, can you verify your engine was rotating freely before disassembly? Can you gently see if the cams will turn or do they require force? Particularly bank 2 intake cam with the engine TDC.
 
betzgb said:
Thanks for the rely. I went the exact same path as you, found the same damage in the timing cover wall where the lifter rides, and ordered 90% of my parts from InfinitiPartsDeal and OE Infiniti parts. Much cheaper than I could do locally. I decided to replace the chains "while I was in there" and that is where I began to suspect much more serious problems. For example, when I went to remove the crank pulley I noticed the engine was binding up and not rotating freely. Also, when I took the old chain off bank two I noticed the intake cam was rotating freely. I would have expected it to be difficult to turn due to upward pressure from the valve springs. Since you are in the same spot in the process as me, can you verify your engine was rotating freely before disassembly? Can you gently see if the cams will turn or do they require force? Particularly bank 2 intake cam with the engine TDC.
Click to expand...

Betzgb,

There is pressure and resistance on the cams as well as the crank....I have good compression as I actually drove it to my buddy's shop....we opened the timing cover to inspect and replace various parts and the cams do not free spin.
 
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