E90 335d Crank No Start – 2E3D EWS-DDE Sync Nightmare After Engine Rebuild

nardo.n54 · 07-21-2025, 07:35 PM

I’m at the end of the road with this issue and really hoping someone here has seen something similar.

Backstory: I fully rebuilt the engine on my 2011 BMW 335d (M57). Engine is back in, everything is properly connected, grounded, and torqued down. When I go to start it, it cranks but will not start. The fuel pump does not prime, and I’m getting a hard 2E3D code: DDE interface error (EWS-DDE sync failure).

What I’ve done so far:

• verified CAS and DDE are matched, ITN numbers are correct
• starter lock reset and everything through ista,inpa,scanner,tool32
• replaced HPFP to rule it out and sensor (showing 5 bar while cranking only)
• fuel pump still not priming at all (probably due to 2E3D EWS-DDE error)
• confirmed every fuse and relay worked in junction box, ecu, everything
• power and ground confirmed
• confirmed can-L and can-H is in spec via OBD

What makes this weirder:I installed the DDE, CAS, and key from a known running 335d into my car — same symptoms: crank, no start, 2E3D code, no fuel prime, engine malfunction warning with key on.Then I took my original CAS, DDE, and key and put them in the other car — that car started and ran perfectly.

This confirms my modules and key are good. The issue is with my car.

Any input or ideas are appreciated, even long shots. I’ve put hours into this and still can’t get past the EWS/DDE sync issue and no fuel pump prime. Thanks in advance.

Fooksdaddy · 07-23-2025, 07:58 PM

Totally wrong forum my guy, M3 and 335 aren’t the same….

Chrisyphus · 08-02-2025, 10:11 AM

My guess is that something in your wiring harness is not correctly routed or connected.

I know you say that everything is done correctly, but.... the fact that you posted this in this forum rather than the correct one tells me that maybe you get things mixed up on occasion lol

Jokes aside, I honestly recommend you just go over everything again. Especially anything that you are a million percent sure is right. Typically, those are the ones that always come back to bite me. Good luck!

07-21-2025, 07:35 PM	#1
nardo.n54 Registered 2 Rep 6 Posts Drives: 1100 HP ST 335i / 335d / F90 M5 Join Date: Apr 2021 Location: Canada iTrader: (0)	E90 335d Crank No Start – 2E3D EWS-DDE Sync Nightmare After Engine Rebuild I’m at the end of the road with this issue and really hoping someone here has seen something similar. Backstory: I fully rebuilt the engine on my 2011 BMW 335d (M57). Engine is back in, everything is properly connected, grounded, and torqued down. When I go to start it, it cranks but will not start. The fuel pump does not prime, and I’m getting a hard 2E3D code: DDE interface error (EWS-DDE sync failure). What I’ve done so far: • verified CAS and DDE are matched, ITN numbers are correct • starter lock reset and everything through ista,inpa,scanner,tool32 • replaced HPFP to rule it out and sensor (showing 5 bar while cranking only) • fuel pump still not priming at all (probably due to 2E3D EWS-DDE error) • confirmed every fuse and relay worked in junction box, ecu, everything • power and ground confirmed • confirmed can-L and can-H is in spec via OBD What makes this weirder:I installed the DDE, CAS, and key from a known running 335d into my car — same symptoms: crank, no start, 2E3D code, no fuel prime, engine malfunction warning with key on.Then I took my original CAS, DDE, and key and put them in the other car — that car started and ran perfectly. This confirms my modules and key are good. The issue is with my car. Any input or ideas are appreciated, even long shots. I’ve put hours into this and still can’t get past the EWS/DDE sync issue and no fuel pump prime. Thanks in advance. Attached Images
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07-23-2025, 07:58 PM	#2
Fooksdaddy First Lieutenant 158 Rep 303 Posts Drives: 2011 BMW M3 SSII Join Date: May 2016 Location: San Antonio iTrader: (3)	Totally wrong forum my guy, M3 and 335 aren’t the same…. __________________ E90 ///M3 Silverstone II '11 (current) E90 ///M3 Silverstone II '08 E46 ///M3 Alpine White III E36 ///M3 Arctic Silver E46 ///M3 Carbon Schwartz
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08-02-2025, 10:11 AM	#3
Chrisyphus Private First Class 475 Rep 194 Posts Drives: e92 M3, Model 3 Performance Join Date: Jan 2024 Location: Danville, Va. iTrader: (0)	My guess is that something in your wiring harness is not correctly routed or connected. I know you say that everything is done correctly, but.... the fact that you posted this in this forum rather than the correct one tells me that maybe you get things mixed up on occasion lol Jokes aside, I honestly recommend you just go over everything again. Especially anything that you are a million percent sure is right. Typically, those are the ones that always come back to bite me. Good luck! __________________ General Manager Head of Engineering and Design
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