[kicker2222]

So yesterday my 335d started to feel like it was misfiring then a CEL popped up for P02CE for cylinder 2. My car has 77K miles on it and I’m not sure if it’s a CBU problem or just an injector needing to be replaced. Any help would be great on what I should do to try to remedy the problem.
Here is the picture :

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[montr]

With your mileage and this code, there is a good chance it is CBU.

[kicker2222]

Originally Posted by montr

With your mileage and this code, there is a good chance it is CBU.

I’m getting about 19 mpg in the city and on the highway combined

[montr]

To be sure that is CBU, you have to run the test shown in this post:
https://www.e90post.com/forums/showthread.php?t=1599225

[kicker2222]

Originally Posted by montr

To be sure that is CBU, you have to run the test shown in this post:
https://www.e90post.com/forums/showthread.php?t=1599225

I’m going to do a cleaning of the intake manifold and install my swirl flap delete this weekend, so I’ll clean it out when I’m in there. I’ve also read that it could be the engine adaptors needing to be reset so after cleaning I’m going to use my Bimmer geek pro tool to reset them.

[at100plus]

yup that's what all my research suggest. I bought my car 2 weeks ago and next day after purchase got the same code. Mine is 2010 with 52k miles so obviously a short trip car. Pulled intake and it's pretty dirty. I'm in the midst of CBU full delete and tune. I found a TSB: SI B13-04-14 that suggests not to throw injectors at this problem rather to CBU and reset crankshaft increment wheel adaptations.

Hope it works. I'll keep you posted. I probably won't be back together for 2 more weeks. Going with DUDMD tune, VFSR down pipe, gut SCR AARodriguez race pipe and swirl delete. Did new vacuum lines. Harmonic balancer looks good. Crossing fingers it goes back together and runs great.

[at100plus]

oh forgot, the TSB says to update DDE then reset the adaptations. DUDMD tune covers the DDE firmware update needed.

[kicker2222]

I can now say it’s probably CBU. I removed my JBD that was set to 100% and drove it for a week and the code is now gone. So I guess next weekend I will do an intake and egr cleaning and I might take a toothbrush at the valves to get some of it off. I’m also going to replace my Tstat while in there.

[robnitro]

Jbd at 100% is not good, it can exceed the pressure that the sensor can detect. This leads to the relief valve opening and can cause issues. 70% is a good number

Example: good case 75%
Offset pressure by 200 bar... So max dde request of 1600 is really 1800 at the sensor. Still within safe range of the relief valve of about 1950- 2000bar


Let's say 100% offsets pressure by 400bar.
Sensor can't sense past 2000 bar, so it will max out... While dde sees "1600". You're exceeding the relief valve pressure and the sensor limit, so there's no regulation of rail pressure by dde/sensor. It opens the relief valve which after so many times will not seal well because it's just there for safety/emergency.

That's why I hate the jbd, and a few have logged that past 80% there are no gains... In some cases losses because the relief is not as smooth regulating pressure as the electronic controls which are exceeded past 80%

[at100plus]

Originally Posted by kicker2222

I can now say it’s probably CBU. I removed my JBD that was set to 100% and drove it for a week and the code is now gone. So I guess next weekend I will do an intake and egr cleaning and I might take a toothbrush at the valves to get some of it off. I’m also going to replace my Tstat while in there.

Toothbrush won't reach the valves, you can't see them and any solvent will just make a mess.

Do a full CBU walnut blast it's really not that hard. Hardest part is getting setup but when you have someone to guide you it's actually not bad. $29 Harbor Freight walnut blaster, make a copper tube modification to the gun. And I got a $120 Teslong endoscope inspection camera on Amazon which is so useful not only for CBU but seeing other tight areas. Cleaning intake is really easy too. Dip in 100% Purple Power degreaser and get a small pump to flow the degreaser thru over night it comes out of the solution like new next morning. No scrubbing.

Anyone who feels they want to do this yourself PM me for my # and I'll walk you thru it. It really helps to have a coach. Best part is you will know it was done right cause I'll tell you what some Indy shops will cheat you and do a crappy job and you will still be getting codes. Ask me how I know.

[rndmguy06]

Originally Posted by robnitro

Jbd at 100% is not good, it can exceed the pressure that the sensor can detect. This leads to the relief valve opening and can cause issues. 70% is a good number

Example: good case 75%
Offset pressure by 200 bar... So max dde request of 1600 is really 1800 at the sensor. Still within safe range of the relief valve of about 1950- 2000bar


Let's say 100% offsets pressure by 400bar.
Sensor can't sense past 2000 bar, so it will max out... While dde sees "1600". You're exceeding the relief valve pressure and the sensor limit, so there's no regulation of rail pressure by dde/sensor. It opens the relief valve which after so many times will not seal well because it's just there for safety/emergency.

That's why I hate the jbd, and a few have logged that past 80% there are no gains... In some cases losses because the relief is not as smooth regulating pressure as the electronic controls which are exceeded past 80%

I have the same error code as the OP. The car recently had the CBU walnut blasted and I believe the adaptations were not reset per the SI B13-04-14.

Sorry for the noob questions, I really have been using the search button.
What is the JBD? How do I reset the adaptations per the SI? Is it as simple as doing one of these?

Adaption body throttle with rheingold ista, BMW. After replacing body throttle.

BMW Ista D Adaptions Reset For Gearbox & Engine Reset Adaptions

Thank you in advance!

[rndmguy06]

For those who have the same questions, I found this post from Mike325tds was very helpful below. ISTA+ was a beast to find the correct files, but the installation documentation is easy to follow. I had an issue changing some INI files for my K/DCAN cable to usb. Youtube search was helpful there.

Those aside, please please use a battery charger! I was pushing 4.1 amps to the battery with a bluetooth RC grade charger. I was stable around 12.2 volts until I began accessing the control modules. Even with the charger I could see the voltage sag .1-.2 volts.

https://www.e90post.com/forums/showp...68&postcount=4

Yes, always connect a good charger, turn off your lights, heated seats, blower and other big power sinks.
The FRM is a ticking time bomb. Even with a good charger connected there is a very small risk that it'll corrupt it's EEprom when asked for it's DTCs and never communicate again. I'd suggest updating it to the latest firmware with WinKFP or go to a dealer and have it updated. Meanwhile they should know about the problem. You have done the correct first step: Turn on ignition, Go to Operations, change to tab "Read Out Vehicle Data" and then klick "Complete identification". It'll take forever (about 3 min). All green modules in the ECU tree are good, yellow ones have faults set, red ones don't communicate.
In order to reset adaptions, change to tab "Vehicle management" in the first row, "Service function" in the second row, Then click "Power train", "Digitial Diesel Electronics (US version), then "adaptations". After CBU cleaning you want to do "Air mass flow sensor", "Increment wheel", "injectors", "mean quantity adaptions". Can't hurt to do "Rail pressure regulating valve" as well.

Note, that resetting "Increment wheel" adaptions might not work due to specific versions of ISTAP and you DDE SW, some others might not work due to a cheaper cable.

For the TCU go back to "Undo All", then "Power train", "transmission control", "Adjustment", "Resetting adaption functions".

Hope that helps.

[Nadir Point]

CBU typically "is" an injector problem - the 2 go hand-in-hand. Walnut blasting is not a recommended cleaning method for fouled injector tips. You can get them properly serviced at a Bosch-licensed pump shop if it's a lower mileage unit, but injectors are wear items and deserve to be replaced in any CBU situation over your high mileage comfort zone.

[2010bmw335d]

Just curious if you solved this problem with the ABC deleted? I have the same exact code and am curious if the delete will solve the problem.

[335dlci]

Delete wont fix this. Did you read any of this thread?