[N55ight]

Hi, everybody I have a 2013 335i xDrive PWG with 100k miles on it. Car has full bolt-ons, such as VRSF chargepipe, BMS intake, VRSF downpipe, VRSF FMIC, BMS cooler valve and step-colder spark plugs.
It’s tuned with MHD Stage 2+ 93oct.

I’ve been driving it with no boost for like 2 months now.
I can feel few psi of boost on low rpm’s,once I go on the throttle, it goes into limp mode.

The codes I’m getting, usually it’s just a:

120308 - Charging pressure control, plausibility
Pressure too low.
120408 - Charging pressure control: Switch-off as
consequential reaction.

but sometimes these join the team:

121531 - Charging pressure, operating range:
Pressure too low.
121533 - Charging pressure - ambient pressure,
comparison: Charging pressure too low.
121521 - Boost pressure sensor. Multiple fault.

I’ve done too many things trying to resolve it .
Smoke test showed a leak at the chargepipe o-ring - replaced, smoke tested again - no
Replaced boost solenoid, hoping that’s the issue - didn’t help .
Cleaned MAF and TMAP Sensors.
And finally replaced the diverter valve with upgraded GFB DV+ .
Unfortunately, none of this helped my boost you can hear turbo spooling up, pretty loud sound through the intake but it cuts off immediately after few psi

Known issues besides low boost:
Vanos code on the cold start: 131501 -Variable camshaft timing control (VANOS),
intake, cold start: not controllable. Replacing solenoids didn’t help, right before I replaced them I decided to clean the OEM ones, and I have a feeling not long after that my problems with boost started. Can be coincidence, can be related, who knows.
Oil pan leaking.

My shops can’t find an issue, and I’m just tired of spending all that money and time for no result. Hope that somebody here had similar issues or can help me out.

Thank you.

[n55david]

Originally Posted by "N55ight;28496962"

Hi, everybody I have a 2013 335i xDrive PWG with 100k miles on it. Car has full bolt-ons, such as VRSF chargepipe, BMS intake, VRSF downpipe, VRSF FMIC, BMS cooler valve and step-colder spark plugs.
It’s tuned with MHD Stage 2+ 93oct.

I’ve been driving it with no boost for like 2 months now.
I can feel few psi of boost on low rpm’s,once I go on the throttle, it goes into limp mode.

The codes I’m getting, usually it’s just a:

120308 - Charging pressure control, plausibility
Pressure too low.
120408 - Charging pressure control: Switch-off as
consequential reaction.

but sometimes these join the team:

121531 - Charging pressure, operating range:
Pressure too low.
121533 - Charging pressure - ambient pressure,
comparison: Charging pressure too low.
121521 - Boost pressure sensor. Multiple fault.

I’ve done too many things trying to resolve it .
Smoke test showed a leak at the chargepipe o-ring - replaced, smoke tested again - no
Replaced boost solenoid, hoping that’s the issue - didn’t help .
Cleaned MAF and TMAP Sensors.
And finally replaced the diverter valve with upgraded GFB DV+ .
Unfortunately, none of this helped my boost you can hear turbo spooling up, pretty loud sound through the intake but it cuts off immediately after few psi

Known issues besides low boost:
Vanos code on the cold start: 131501 -Variable camshaft timing control (VANOS),
intake, cold start: not controllable. Replacing solenoids didn’t help, right before I replaced them I decided to clean the OEM ones, and I have a feeling not long after that my problems with boost started. Can be coincidence, can be related, who knows.
Oil pan leaking.

My shops can’t find an issue, and I’m just tired of spending all that money and time for no result. Hope that somebody here had similar issues or can help me out.

Thank you.

Post a proper log, let's see what the numbers say.

[N55ight]

Originally Posted by Phantom10R

Post a proper log, let's see what the numbers say.

Waiting on my mhd adapter to come, old one got busted.
What parameters should I log? Boost target, wastegate angle, what else?

[n55david]

Originally Posted by "N55ight;28498350"

Waiting on my mhd adapter to come, old one got busted.
What parameters should I log? Boost target, wastegate angle, what else?

Everything

[N55ight]

Originally Posted by Phantom10R

Everything

Got logs today,WOT second gear up to 6k rpm and shifter to third. There’s one logs in here - one before limp mode and after.
Let me know what you thinking, please.

https://datazap.me/u/n55ight/f30-n55...-3-4-5-8-10-13

[N55ight]

Things I can think of: TMAP sensors, Inpet pipe, Vanos intake unit. (doubt that it causes low boost, since it doesn’t go into limp mode because of VANOS, except for cold starts, that’s another mistery for me). Maybe there’s some other vacuum lines that I didn’t check, but after doing smoke test couple times and having no boost at all doubt it’ll be small vacuum leak.

[N55ight]

By taking a better look at my logs, I’ve noticed that my TMAP voltage readings almost didn’t change. I don’t know BMW specs for TMAP, but it seems like voltage should go up when pressure goes up (assuming there’s any pressure in the chargepipe, which I can’t really prove with having no boost).
Also MAF readings are way lower than a target, which means that a sensor itself is bad or there’s an air leak?
I’ve ran a car without MAF to see if there’s any changes and there’s none except for a bit better idle, which is normal considering I got BMS intake.
Might test the TMAP later, by blowing some air on it and checking voltage, hopefully something comes up.
Wastegate seems to be hard reaching a target at some points too, internal actuator problem?
Anyway, waiting on some experts here to properly read my logs.

[thejeremyman9]

1. Flash back to stage 0, but keep MHD installed.

2. Enable WAY more logging parameters, and read my thread on datalogging: https://f30.bimmerpost.com/forums/sh....php?t=1732327

3. Reset adapations in MHD (not transmission)

4. Collect a 4th gear pull (8AT) or 3rd gear pull (6MT) log after doing the above and driving ~10-15 miles first.

Was your smoke test pressurized? A smoke test without 15+ psi is really only for vacuum leaks, not boost leaks.

An issue with the inlet shouldnt cause boost problems.

[N55ight]

Originally Posted by thejeremyman9

1. Flash back to stage 0, but keep MHD installed.

2. Enable WAY more logging parameters, and read my thread on datalogging: https://f30.bimmerpost.com/forums/sh....php?t=1732327

3. Reset adapations in MHD (not transmission)

4. Collect a 4th gear pull (8AT) or 3rd gear pull (6MT) log after doing the above and driving ~10-15 miles first.

Was your smoke test pressurized? A smoke test without 15+ psi is really only for vacuum leaks, not boost leaks.

An issue with the inlet shouldnt cause boost problems.

It was a pressurized smoke, however don’t remember top pressure it makes, can’t find nobody with boost leak tester, might need to order one.

Regarding logs - will do. However, it won’t let me go over 5k rpm most of the time, because it goes into limp mode and starts jerking until
I shift it higher. Maybe on stage 0 it won’t go into limp that early.

[n55david]

Originally Posted by "N55ight;28503211"

It was a pressurized smoke, however don’t remember top pressure it makes, can’t find nobody with boost leak tester, might need to order one.

Regarding logs - will do. However, it won’t let me go over 5k rpm most of the time, because it goes into limp mode and starts jerking until
I shift it higher. Maybe on stage 0 it won’t go into limp that early.

Well you gotta give it a try

[5w20]

eccentric shaft issues or VANOS problems

[N55ight]

Originally Posted by 5w20

eccentric shaft issues or VANOS problems

What makes you think that? I performed a Valvetronic calibration and it went fine, no issues found - everything synchronized. Also at the same day (like 2 days ago) I checked the vanos degrees on inlet and exhaust and it looked okay, same as required all the time. After doing that test car didn’t throw vanos codes anymore, hopefully it stays like that, will see. If it works, then recommend everybody with similar problems to do so before messing with vanos units and timing.

[N55ight]

Originally Posted by 5w20

eccentric shaft issues or VANOS problems

And I had an F10 N55 with valvetronic issues, car was working just fine with disabled valvetronic, never had issues w boost.

[N55ight]

Originally Posted by thejeremyman9

1. Flash back to stage 0, but keep MHD installed.

2. Enable WAY more logging parameters, and read my thread on datalogging: https://f30.bimmerpost.com/forums/sh....php?t=1732327

3. Reset adapations in MHD (not transmission)

4. Collect a 4th gear pull (8AT) or 3rd gear pull (6MT) log after doing the above and driving ~10-15 miles first.

Was your smoke test pressurized? A smoke test without 15+ psi is really only for vacuum leaks, not boost leaks.

An issue with the inlet shouldnt cause boost problems.

https://datazap.me/u/n55ight/pwg-n55...-6-11-12-14-19

[N55ight]

Originally Posted by Phantom10R

Everything

New logs posted above ^

[N55ight]

Not sure why rpm is not included in logs, but I went from around 2,300 to ≈5500, won’t let me go past that.

[thejeremyman9]

Originally Posted by N55ight

https://datazap.me/u/n55ight/pwg-n55...-6-11-12-14-19

In the first log, WGDC position looks way below target.

In the 2nd log, WGDC reads 0% the entire time...

If you are confident there are no leaks it could be a WG/turbo issue.

[N55ight]

Originally Posted by thejeremyman9

In the first log, WGDC position looks way below target.

In the 2nd log, WGDC reads 0% the entire time...

If you are confident there are no leaks it could be a WG/turbo issue.

That looked odd to me as well, it was like that on other logs too, but it might be because it went into limp mode at some point

[N55ight]

Will try to put stock IC back on, maybe it’s internally cracked will check o-rings once again, if it doesn’t help is wastegate actuator a common issue?

[thejeremyman9]

Originally Posted by N55ight

Will try to put stock IC back on, maybe it’s internally cracked will check o-rings once again, if it doesn’t help is wastegate actuator a common issue?

I am just throwing ideas out there. I am less familiar with PWG so i would do some separate google searches.

[N55ight]

So, kinda update here:
Decided to put more stress on the car by keeping it at 6k rpm for like 10 seconds to trigger cel, new code showed up, I’ve seen it before but never payed attention to it: 191C02 - Fuel tank ventilation system, 2nd inlet point: Malfunction.
Is there any specific vacuum lines going to fuel tank vent? Have a feeling it might be something, I didn’t check or notice. Not sure if the valve itself can cause no boost condition, so hoping it’s a hidden line somewhere.

[N55ight]

- ME active codes
102001 - Air volume, plausibility: Air volume
too high.
102002 - Air volume, plausibility: Air volume too low.
120308 - Charging pressure control, plausibility
Pressure too low.
120408 - Charging pressure control: Switch-off as
consequential reaction.
121531 - Charging pressure, operating range:
Pressure too low.
121533 - Charging pressure - ambient pressure,
comparison: Charging pressure too low.
131501 - Variable camshaft timing control (VANOS),
intake, cold start: not controllable.
191 C02 - Fuel tank ventilation system, 2nd inlet
point: Malfunction.
- DME shadow (inactive) codes
121521 - Boost pressure sensor. Multiple fault.

Air volume codes don’t make any sense to me - too low AND too high?🤔