F10 N63 Dreaded Fuel Pressure Issues: Help??

[boliversmith]

I have a 2011 550i, and I have now had the car stall out twice while driving on the highway. I wasn't pushing it hard, I just got the initial "Fuel System: Drive Moderately" and then a few minutes later I got the "Drivetrain Malfunction: Drive Moderately" and then the engine died. In both cases, when the engine cooled down again, it started up fine. Here are the codes i am getting: 11A204, 110001, 11A002, and 119208, 481B01, 481B02. I am assuming this is going to be either the HPFP or LPFP. Does anyone have any suggestions on diagnosis beyond just replacing all the parts? If it is HPFP, do these codes give any indication on which HPFP it is, or both? Also thinking it could be the fuel pump control module. Could it be something else I am not thinking of? I have read some theories it could just be a bad battery too. Also, I recently installed a Dinan stage 2 tune, could this be part of it? Dinan says no, but of course they do. It's weird to me that it runs ok after sitting for a while (at least 30 mins). Makes me feel like it could also be a computer thing. Any advice on diagnosis would be very helpful!

[shogun]

I changed the thread title and moved it to the F10 forum

[boliversmith]

Ok, so I was able to catch the car dying while recording the sensors. Can you guys verify my analysis? What I am seeing here is that the fuel pump speed and fuel pressure low pressure sensor both dropped several seconds before the car stalled. The rail pressure was consistent until the car stalled. I am interpreting this as a failure in the LPFP, and not in the HPFP. You guys agree? See graph below...

[daveiezzi]

I noticed you didn't get any replies to this thread, were you able to isolate the problem or did you replace everything? I have similar symptoms on a 2010 550i GT with the N63. I bought it used with 60k miles & am not sure if any of the fuel pumps or control module were replaced under warranty or recall. I currently have close to 180k miles & would love to keep it alive a little longer. Thanks in advance for any help.

[boliversmith]

It ended up being the control module. I got one on Amazon, and it was plug and play, no coding needed. Took 10 mins to switch out.

[daveiezzi]

I replaced both HPFPs, it runs better but I'm still stalling. I pulled the control module out today to see if there was any corrosion due to it being in the trunk but I didn't see any. I see numerous 16147276073 control modules on Amazon, can you steer me toward the one you purchased? I know ET3 makes a replacement unit with enhanced temp control for $315 but I prefer to go with one of the standard, less expensive units. I believe the ET3 unit requires a recoding, I'm assuming your's didn't. Thanks again.

[boliversmith]

Here is the one I bought for $75: https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1

I didn't need to recode it, but I can't guarantee that is the case. Usually, I think it does need recoding, but I lucked out. Hopefully it will be the same foryou.

[daveiezzi]

Thanks again, I'll report back.