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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Error 120308 - charging pressure control, plausibility pressure too low
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      07-28-2019, 09:13 PM   #1
burro_blasta
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Error 120308 - charging pressure control, plausibility pressure too low

Anyone have personal experience hunting this one down on our cars? I'm 535xi pwg

Got a boost leak test/fix based on some suspicious logs before the code ever showed up

The suspicious logs didn't change, so I put on a new boost solenoid and new solenoid-to-wastegate vacuum hose and that's when this code showed up. I put the old solenoid back on (in case the new one is faulty) but still got the code.

Next step in the wild goose chase is to test the wastegate itself. SMH
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      08-02-2019, 08:12 AM   #2
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Quote:
Originally Posted by burro_blasta View Post
Anyone have personal experience hunting this one down on our cars? I'm 535xi pwg

Got a boost leak test/fix based on some suspicious logs before the code ever showed up

The suspicious logs didn't change, so I put on a new boost solenoid and new solenoid-to-wastegate vacuum hose and that's when this code showed up. I put the old solenoid back on (in case the new one is faulty) but still got the code.

Next step in the wild goose chase is to test the wastegate itself. SMH
Quote:
Originally Posted by burro_blasta View Post
Anyone have personal experience hunting this one down on our cars? I'm 535xi pwg

Got a boost leak test/fix based on some suspicious logs before the code ever showed up

The suspicious logs didn't change, so I put on a new boost solenoid and new solenoid-to-wastegate vacuum hose and that's when this code showed up. I put the old solenoid back on (in case the new one is faulty) but still got the code.

Next step in the wild goose chase is to test the wastegate itself. SMH
I have seen this before. I had a few leaks. Wha makes it so bad, I had the leaks for years and really didn't know I had them til I started upgrading the performance.
How did u do the boost leak check?
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      08-02-2019, 11:04 AM   #3
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I had the boost leak test/pressure test done at an indy shop. Weird that the code only showed up after the leaks were fixed.

When you got the 120308 code, did it ever get accompanied by these kind of misfire/injector/combustion codes? The first time I only got the 120308 code (with Dmal/limp mode), but the next wot log I also got these codes (with Dmal/limp mode)...I'm really hoping that these codes are just from the Dmal/limp mode and the only real problem I have is the 120308 issue, any insight there? My plugs/coils are only 5k miles old, and I'd be surprised if my injectors coincidentally went at the same time I'm having these other issues....

140001 - misfire, several cylinders: fuel injection is switched off
140010 - combustion misfires, several cylinders: detected
140201 - misfire, cylinder 2: fuel injection is switched off
140210 - combustion misfire, cylinder 2: detected
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      08-04-2019, 06:02 AM   #4
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Are you running stock plugs at the stock gap? When tuned you have higher cylinder pressures, which makes its much harder for the spark to jump the gap. Which fries the coil packs overtime. Common issue when tuning.

Iíd recommend replacing your plugs and probably coil packs and running a tighter gap on the new plugs. Probably .022 ish.

Common problem if you havenít tightened the gap is killing coil packs and misfires in a tuned engine.

Happed to me on the 11 gti I had with a k04 turbo upgrade.
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      08-04-2019, 09:54 AM   #5
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Hadn't considered that. Very weird it hit at the same time as the low boost issue but now I'm just getting the combustion/misfire error about midway through 3rd, where before I had to get closer to 5k-6k to get the low boost code to hit. Might just be that I'm getting tag teamed by both issues at once.

The plugs and coils only have 5k miles on them, and I've only gone through 4 custom tune revisions so far so haven't been using the custom tune on a daily basis...but since I'm going through revisions I'm WOT doing logs all the time.

Does that seems stupid early to have plug/coil issues or totally possible?
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      08-04-2019, 10:27 AM   #6
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Quote:
Originally Posted by burro_blasta View Post
Hadn't considered that. Very weird it hit at the same time as the low boost issue but now I'm just getting the combustion/misfire error about midway through 3rd, where before I had to get closer to 5k-6k to get the low boost code to hit. Might just be that I'm getting tag teamed by both issues at once.

The plugs and coils only have 5k miles on them, and I've only gone through 4 custom tune revisions so far so haven't been using the custom tune on a daily basis...but since I'm going through revisions I'm WOT doing logs all the time.

Does that seems stupid early to have plug/coil issues or totally possible?
Do you have the original plugs and coils? Maybe start swapping it out one by one... I had one of my spark plug went bad... I put my one of the original 40k plug back in and the misfire went away... right now I am just on a ots map
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      08-04-2019, 10:30 AM   #7
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I'll check it out. Thanks for this, hadn't considered this in my troubleshooting...

Is there any chance that the low boost plausibility code could be some weird reaction to the misfire - like the dme cuts boost or something, and there's not a separate issue there? Doubt it but just wish these issues were related
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      08-04-2019, 10:37 AM   #8
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As far as swapping plugs, another weird thing about this is that it says multiple cylinders. Made me originally think it's either fuel pump issue or just from limp mode bc of the low boost issue.
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      08-04-2019, 10:51 AM   #9
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Don't know if this helps but I found a pic of when I had the misfiring issue...
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      08-04-2019, 11:21 AM   #10
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Awesome, that's it.

And it was just your cylinder 1, even though it said multiple cylinders?
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      08-04-2019, 11:42 AM   #11
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I took mine to bmw and a shop. They missed my leaks. I purchased a boost leak tester myself and applied the psi that I wanted my car to have. Found several leaks after shops told me they didn't see any. Because you are tuning the car now, more issues are presenting themselves. Order you the boost leak tester first and check for leaks. Re gap your plugs. And last but not least, check for exhaust leaks. I had several and they cause hesitation that drove me crazy for months. Was thinking it was the lpfp, bad gas, coil packs, plugs, and these vacuum leaks. I spent a pile and it was the exhaust leaks. The vacuum leak finds were the bonus.
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      08-04-2019, 12:03 PM   #12
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Quote:
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Awesome, that's it.

And it was just your cylinder 1, even though it said multiple cylinders?
Yes
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      08-05-2019, 01:56 PM   #13
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ey2001, it's def looking like plugs are part of the problem so thanks again

bmw5sport, I've got the diy leak test on my list for the future. Good heads up on the exhaust leak, that must've been infuriating
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      08-05-2019, 10:48 PM   #14
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Quote:
Originally Posted by burro_blasta View Post
ey2001, it's def looking like plugs are part of the problem so thanks again

bmw5sport, I've got the diy leak test on my list for the future. Good heads up on the exhaust leak, that must've been infuriating
No problem!! Glad you got it figured out!
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      08-06-2019, 04:35 AM   #15
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Quote:
Originally Posted by burro_blasta View Post
ey2001, it's def looking like plugs are part of the problem so thanks again

bmw5sport, I've got the diy leak test on my list for the future. Good heads up on the exhaust leak, that must've been infuriating
Keep us posted. Curious to know what fixes your issue
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      08-06-2019, 08:16 AM   #16
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Will do
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      08-13-2019, 02:10 PM   #17
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Will do
Any updates?
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      08-13-2019, 11:10 PM   #18
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Still at the shop - so far replaced an Injector and put in NGK 97506 one step colder plugs gapped at .022" (per the tuner) and all those 140xxx misfire/combustion codes are gone.

He can't replicate the low boost code. It only started after I replaced the boost solenoid, so there's a chance it was a faulty (new) solenoid which I've swapped out since. I'm hopeful but kind of expecting it to show up again somehow.

The last issue we're trying to sort out is my wgdc gets to 100% with the custom tune even though I only get to ~10psi at the top. That's low even for Pwg, but I'm in Denver so maybe it's just the altitude. Still weird that it's at 100%. Still need to test the wastegate actuator to make sure it's fully closing at 5 in/hg vacuum, and if it is then I think I need to shrug it off and send it...

Here are logs showing 100% wgdc on the 4th revision of my custom tune:

https://datazap.me/u/ahetts/v4-3-log...0&data=3-14-24

And here's a log from before I started custom, using mhd stage 1, where I'm also at ~10psi at the top but only 60% wgdc. Weird stuff.

https://datazap.me/u/ahetts/no-cylin...o=3&mark=48-56
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      08-14-2019, 07:49 PM   #19
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Quote:
Originally Posted by burro_blasta View Post
Still at the shop - so far replaced an Injector and put in NGK 97506 one step colder plugs gapped at .022" (per the tuner) and all those 140xxx misfire/combustion codes are gone.

He can't replicate the low boost code. It only started after I replaced the boost solenoid, so there's a chance it was a faulty (new) solenoid which I've swapped out since. I'm hopeful but kind of expecting it to show up again somehow.

The last issue we're trying to sort out is my wgdc gets to 100% with the custom tune even though I only get to ~10psi at the top. That's low even for Pwg, but I'm in Denver so maybe it's just the altitude. Still weird that it's at 100%. Still need to test the wastegate actuator to make sure it's fully closing at 5 in/hg vacuum, and if it is then I think I need to shrug it off and send it...

Here are logs showing 100% wgdc on the 4th revision of my custom tune:

https://datazap.me/u/ahetts/v4-3-log...8;data=3-14-24

And here's a log from before I started custom, using mhd stage 1, where I'm also at ~10psi at the top but only 60% wgdc. Weird stuff.

https://datazap.me/u/ahetts/no-cylin...#38;mark=48-56
Yeah I had that wasted gate issue also. Performance shop in Charlotte didn't know they were suppose to adjust the waste gate actuator when they moved it from the factory turbo. They didn't wanna change the factory setting. Smdh. And this was a high end shop. When I finally checked myself, it didn't close til at about 15 hg inches of vacuum.
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