[F34335D]

Hi all, I’m new here and want to find out if anyone has experienced a similar problem.

Xmas eve my 2014 335d (N57) xDrive (all standard) cut out on me after a 50 mile trip resulting in drivetrain, abs, stability all blinking at me from the iDrive.

After 4 attempts at push/start it got going again and I was able to continue my journey and return home with the wife and kid safely.

Approximately 4 hours later I had to pop to a local store, in 0.5 miles the car cut out, same errors on iDrive but started going again. Total journey 1mile I made it to the store with no further problems.

5 minutes later I went to start her up and she cut out, leaving me stranded in the middle of the car park. Eventually I got going again but the engine would cut out every few seconds so I put her in a parking bay and called the breakdown company.

3 hours later they arrive and the car wouldn’t start – admittedly I had flatten the battery, eventually after some charging we got her going. The breakdown truck followed me home and the car cut out another 3 times, picking and choosing when to start.

Since then I haven’t been able to move the car off the drive, it will run for a short time then die.

The breakdown company pulled a load of errors, I also used bimmerlink and ISTA+ which appear to point to a DDE internal fault.

Also a local BMW specialist came over to scan the car and said he would first suggest sending off the ECU.

This is where this story takes a twist - I took out the ECU and sent it off for testing, whilst packaging the ECU I smelt diesel but thought this was from the garage floor. The ECU was returned to me today as they were unable to test (model not supported I believe) however the package was damp with diesel so I placed the ecu in a container upside down and at least 50ml of diesel has come out of the unit by the pins?!

Where the ECU is placed on the N57 appears to be free of fuel lines, I need to check further but when I removed the ECU to begin with I had a thorough look for leaks or dampness which I found no signs, so why is there Diesel dripping out of the DDE ☹

Has anyone heard of anything like this before? I’m stumped with what to do now because I don’t want to fork out replacing the DDE if I could potentially ruin the new one should this fuel inside the unit be from a recent malfunction.

[Enabled]

In other older models, I have seen wiring carry the fuel from failed sensors in the system (rail pressure sensors, solenoids) that move fuel into the DDE box via capillary action.
You should very carefully inspect the dde connectors and all the fuel sensors, solenoids, switches, etc.

Which DDE is this exactly? EDC17CP45 is very difficult to open and inspect inside unfortunately, however they can be cloned easily.

[F34335D]

Yeah looks like a good few hours or snooping about the engine bay for signs.

Originally Posted by Enabled

Which DDE is this exactly? EDC17CP45 is very difficult to open and inspect inside unfortunately, however they can be cloned easily.

DDE 8579748 or BOSCH# 0281030983

[F34335D]

Finally after the weather has cleared I've been able check all the sensors and connectors I can see but can't find which one is causing the leak.

The fuel pressure temperature sensor was a pain to get too and I can't get good visibility.

I've dried out the DDE and connected it all back up to see if it makes seeing the source any easier. According to the patch of diesel in the connector it looks like x20008 is the culprit but its difficult to identify the exact pins, especially when my only real identification device in my nose.

DDE connectors
x20008

Any suggestions on other methods to identify it? And does anyone know how to gain better access to the high pressure fuel pump without taking the whole car apart

[Enabled]

The fuel pressure/temperature sensor (low pressure system) located on the left side of the engine near the gearbox, on the fuel line going to HPFP is connected to pins 45, 46, 47, and 48 of x20008.

https://www.newtis.info/tisv2/a/en/f...ilter/FIbAbtXk

it's worth verifying

It's actually the only component in the fuel system that goes to x20008

[F34335D]

Any idea on part number? Can't find it on realOEM

https://ibb.co/YNh1P8G

If I gain enough access and disconnect the sensor should I expect lots of fuel? it appears to have fuel flow through it.

**EDIT

Looks like the whole line would need replacing. should much fuel be expected and would it need purging?

[Enabled]

If the car is off, you will get a little dribble. Nothing to concern yourself about if you just plug the line to prevent more dribble.

I would disconnect the connector to it and inspect for fuel sitting inside the connector to confirm first. I am curious myself.

[F34335D]

Originally Posted by Enabled

If the car is off, you will get a little dribble. Nothing to concern yourself about if you just plug the line to prevent more dribble.

I would disconnect the connector to it and inspect for fuel sitting inside the connector to confirm first. I am curious myself.

FOUND IT! soaked in diesel!

https://ibb.co/gDWD3QG

Thanks for the help!

Now its onto replacing the sensor/fuel line, do you have any advice for that

[F34335D]

**Bumping this one back up**

For anyone interested this is what happened apart from this relates to the G30 N57 - https://static.nhtsa.gov/odi/tsbs/20...54822-9999.pdf I've now read about it with older X5s and other N57s, are BMW only acknowledging it from 2019?


I've replaced the Fuel-line/sensor & DDE. Most errors have now gone and the car has started, coughed spluttered then switched off again, since that it's nearly running but shutting down.

Also bled the injector fuel lines (1,2,3) of air but my question is what should the rail pressure be when the car is switched off?

It's showing 4 to 5 bar when turned off and reaches 70 - 90 whilst cranking.

[F34335D]

Very late update.. had car running perfectly a few days after the last post and have now covered over 3000 miles. It's still running perfectly fine.

[ashley1989]

Originally Posted by F34335D

Very late update.. had car running perfectly a few days after the last post and have now covered over 3000 miles. It's still running perfectly fine.

Hi, which garage did you take it to? It seems like I've got the same issue and it's really annoying

[F34335D]

Originally Posted by ashley1989

Hi, which garage did you take it to? It seems like I've got the same issue and it's really annoying

Hi Ashley, I managed to fix it myself but had to send the ECU off to be cloned.

Purchased a second hand harness, new fuel pressure sensor and hand pump to bleed the fuel lines.

Does your ECU smell of or show signs of diesel?

[Craig-335D]

I've got the same problem with my 2015 335d. It suddenly won't start and ista can't find the dde.

I've noticed some residue on one of the plugs to the dde.

I was wondering if you could tell me which harness you purchased and how hard it was to fit?

Also how much did it cost to code the dde?

[Nisar]

Craig Did you find out which loom to replace?
As I have the same problem in my 2015 435D.
Car started and ran for 10 seconds then cut out with drive train and fuel and ABS ect faults.
But would not crank after cutting out.
When scanning the vehicle I could not access the engine DDE.
So after some inspection found my DDE had a small bit of diesel in 1 of the plugs.
I opened my DDE and found it to be soaked in diesel about atleast a small cup full of diesel.
Anyway I've tried drying the DDE out after cleaning it but still nothing.
So now I've ordered a replacement DDE,The fuel temperature sensor and line aswell as a second hand loom.
But like you want to know which loom is it exactly.
I ordered the loom thats on top of the engine

[ssf556]

Is there a certain model year that BMW addressed this issue. Should I be worried about this with my 2018 X5 diesel. I am in the states.

[Nisar]

Its only on the 335D,435D.
Straight 6 with twin turbos.
The looms dont need changing.Just the fuel temperature sensor,fuel pipe and cloned replacement ECU (DDE).
I used brake cleaner and paper towels to clean the connectors.As long as its only that sensor thats wet and you fix the issue.Just cleaning works perfectly fine.
I had a second opinion from a bmw tech who told me its not necessary to change the loom unless there's diesel in other connectors aswell.

[eyenotion]

Having the same issue with my F31 N47 right now. Sent the DDE off for cloning to replacement unit. Fingers crossed!

First I knew about it is my turbo actuator stopped working. When I disconnected it the connector was full of diesel. Investigated further and found a swimming pool of diesel in the top of the DDE

[capt_slow]

Originally Posted by eyenotion

Having the same issue with my F31 N47 right now. Sent the DDE off for cloning to replacement unit. Fingers crossed!

First I knew about it is my turbo actuator stopped working. When I disconnected it the connector was full of diesel. Investigated further and found a swimming pool of diesel in the top of the DDE

How old is your F31?

I'm looking to include this as a periodic inspection item in my maintenance plan.

The fuel line part referenced in the SIB 13 01 19 for the G30 B57 is the most current version and introduced in July 2017. The same for F31 N47 was January 2016. But sounds like the revision change on the sensor isnt associated to revision in the part.