N55 LPFP Failure

[ignote]

2011 135i N55 DCT - Build Date 04/10. 76K miles

Had the LPFP go out. Start up in the morning and when I tried to give it gas, the whole car would shudder. After about 4 miles of light driving, it finally threw a code. I was able to drive it 25 miles to the stealer.

They changed out the pressure unit and the filter. Part numbers 16147163298 and 16117163295. Says they drained the fuel tank as well.

Comments said: Worn fuel pump caused clogged fuel filter and low delivery pressure at times. DME fault 2C01 stored.

[Yeineken]

Sorry to hear this. I have a MY2011 N55 DCT 08/10 build date with 80K miles. Pretty similar to your car and have never had this kind of problem.

What kind of fuel have you been using? Do you run a tune or any mods?

[TheCaptain]

Unless you're under warranty, how much damage to your wallet did it cause?

[ignote]

Originally Posted by Yeineken

Sorry to hear this. I have a MY2011 N55 DCT 08/10 build date with 80K miles. Pretty similar to your car and have never had this kind of problem.

What kind of fuel have you been using? Do you run a tune or any mods?

95% of the time I use Top Tier fuel. Shell, Exxon, Costco.
I just had PPK flashed and no other mods.

[ignote]

Originally Posted by TheCaptain

Unless you're under warranty, how much damage to your wallet did it cause?

The dealer charged 781.00 after some major presentation of getting a BMW goodwill adjustment.

I figure 781 is on the high side of the going rate but I did get a free service loaner in the process.

[ignote]

Ok. Two weeks since the LPFP was replaced and I had the same problem with the car this morning. No codes this event.

What do you all think? Is it the HPFP?

[Dackelone]

Try switching where you buy your fuel. Perhaps their tanks have water in it or perhaps they aren't selling top tier fuel like you think.

You can have your fuel tested by a lab - so see whats really in it.

I'm kind of surprised that the LPFP was covered under the emission warranty. ? Maybe look under your hood to see what region your car was built for. ie: California specs or LEV or SULEV - those regions/specs have longer emissions warranties.

[ignote]

Originally Posted by Dackelone

Try switching where you buy your fuel. Perhaps their tanks have water in it or perhaps they aren't selling top tier fuel like you think.

You can have your fuel tested by a lab - so see whats really in it.

I'm kind of surprised that the LPFP was covered under the emission warranty. ? Maybe look under your hood to see what region your car was built for. ie: California specs or LEV or SULEV - those regions/specs have longer emissions warranties.

I purchase fuel from several different stations often more than 20 miles apart. The first time I got the code it was Exxon and the second time was Shell.

You don't think it's the HPFP then?

[DTM135i]

It doesn't sound like an HPFP issue based on my experience. I just replaced mine a few weeks ago. Usually you know the HPFP is going out because you get long cranks when you start the car, like the battery is going out.

[ignote]

Originally Posted by DTM135i

It doesn't sound like an HPFP issue based on my experience. I just replaced mine a few weeks ago. Usually you know the HPFP is going out because you get long cranks when you start the car, like the battery is going out.

I've had the long cranks for some time now. I had the dealer look at that in the spring and they said it was normal.

[ignote]

Originally Posted by ignote

I've had the long cranks for some time now. I had the dealer look at that in the spring and they said it was normal.

Threw the 2C01 code again this morning. High pressure fuel, Pressure too low.

The start was on the rough side and then smoothed out some. I let it idle for a few minutes before trying to drive it. Once I began to get on the gas and got up to around 20 mph the car began to stutter and threw the code.

I did pick up a HPFP yesterday at bmwparts. I'll install it tomorrow and see if that fixes it.

[ignote]

Originally Posted by ignote

Threw the 2C01 code again this morning. High pressure fuel, Pressure too low.

The start was on the rough side and then smoothed out some. I let it idle for a few minutes before trying to drive it. Once I began to get on the gas and got up to around 20 mph the car began to stutter and threw the code.

I did pick up a HPFP yesterday at bmwparts. I'll install it tomorrow and see if that fixes it.

Just pulled the old HPFP. It was a 933 pump.
I thought all the N55s had the newest 170 pump.

The pump swap is complete and the car fired right up with no leaks. I guess I did it right. Total time was 3 hours taking my time with a 10 minute break in the middle.

Update: It has been a few days and the car starts better than it has in a year of longish cranks. Starts up lots quicker now. This problem was definitely the HPFP.

[DTM135i]

Glad it worked. I knew it was not normal because it kept on getting worse. At first the long crank would happen once every month, then every week, then it would happen on every cold start. That's when I replaced mine. I used the 446 model though. I searched and searched and found conflicting comments on which was the newer part. I went with the 446 because I figured the higher part number was the newer part.

Just double checked the one I pulled out of the car was a 170, well that is what I am guessing. The number on the part was 7615617-01

[ignote]

Originally Posted by DTM135i

Glad it worked. I knew it was not normal because it kept on getting worse. At first the long crank would happen once every month, then every week, then it would happen on every cold start. That's when I replaced mine. I used the 446 model though. I searched and searched and found conflicting comments on which was the newer part. I went with the 446 because I figured the higher part number was the newer part.

Just double checked the one I pulled out of the car was a 170, well that is what I am guessing. The number on the part was 7615617-01

I used the 446 part as well. The price was half what they were selling the 170 part for. I asked the guy at bmwparts.com what the difference was and why they had both parts. He said he thought that the dealership used the 446 pump for warranty work and the 170 was for retail sales. The sticker on the box was dated sept 2016.

[DTM135i]

How has that HPFP been working out for you? Mine already seems to be giving me problems again. But different than last time. It still fires up quickly but if it is really cold it will immediately die like it's not getting enough fuel and one regular days it sounds like it is going to stall on initial start up but it doesn't.

[ignote]

Originally Posted by DTM135i

How has that HPFP been working out for you? Mine already seems to be giving me problems again. But different than last time. It still fires up quickly but if it is really cold it will immediately die like it's not getting enough fuel and one regular days it sounds like it is going to stall on initial start up but it doesn't.

Mine is still starting and running fine so far, even when it is very cold. Knock on wood.