P02CB

pdx.e9d · 07-22-2022, 10:56 PM

I need help.

I have a P02CB code.

Thought it was the red intercooler hose so replaced that and the upper hose that's attached to the throttle body as well. And replaced a leaking turbo oil line. But still not getting full power all the time and going into limp mode if I cruise at higher gears not driving the car hard.
Higher RPM feels like boost is hitting but still rolling a lot of coal most of the time.
Thinking it might be the throttle body but figured it's best to ask for a 2nd opinion before spending more money on parts.
And rolling a crazy amount of coal, especially during upshifts when pushing the car.

Replaced this turbo oil line due to it leaking, also replaced upper intercooler hose connecting to throttle body, and lower red turbo hose.

After replacing the oil line the turbo woke up and everything seemed back to normal on the drive to work. Then on the drive home it bogged down again and is rolling more coal than ever and less and less power.

335dlci · 07-24-2022, 12:04 PM

P codes are useless. Recommend a better diagnostic tool.

lnxguy · 07-24-2022, 06:06 PM

^--- Yup. Still sounds like you've got a major boost leak somewhere.

nonford · 07-25-2022, 04:59 PM

Check your hose again (red one)...In fact you can stand outside of the vehicle, and if that hose is not on completely on, you will hear the hiss!!! Depending on how you put the band on, its hard to actually see the gap when it slips off.

I was going nutz with mine and finally bought a new band that actually gripped that rubber better...no mo slip for me...

pdx.e9d · 07-28-2022, 03:22 PM

Yeah but I still have power in the higher end with no loss in boost or power. Only below 2500 rpm

pdx.e9d · 07-28-2022, 06:42 PM

I got BimmerLink and it reads the codes as this

lnxguy · 07-29-2022, 12:46 PM

Vac lines or pressure convertors. Google will help.

pdx.e9d · 07-29-2022, 11:05 PM

Intercooler is blown

335dzlll · 11-15-2023, 06:09 PM

How did you know it was blown?

I am fighting the same issue as you at the moment.

BB_cuda · 11-15-2023, 08:12 PM

OP had a boost leak and his IC was culprit. Boost leak can come from lots of places. The hose connections is always best place to start hunting though. The upper seal in the red hose seems to last about 1 year.
Best long term solution is to get away from the OE jubilee clips. I use ATM intercooler to allow the hoses and nice band clamps.

07-22-2022, 10:56 PM	#1
pdx.e9d New Member 0 Rep 7 Posts Drives: BMW 335d e90 Join Date: May 2022 Location: Oregon USA iTrader: (0)	P02CB I need help. I have a P02CB code. Thought it was the red intercooler hose so replaced that and the upper hose that's attached to the throttle body as well. And replaced a leaking turbo oil line. But still not getting full power all the time and going into limp mode if I cruise at higher gears not driving the car hard. Higher RPM feels like boost is hitting but still rolling a lot of coal most of the time. Thinking it might be the throttle body but figured it's best to ask for a 2nd opinion before spending more money on parts. And rolling a crazy amount of coal, especially during upshifts when pushing the car. Replaced this turbo oil line due to it leaking, also replaced upper intercooler hose connecting to throttle body, and lower red turbo hose. After replacing the oil line the turbo woke up and everything seemed back to normal on the drive to work. Then on the drive home it bogged down again and is rolling more coal than ever and less and less power. Attached Images
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07-24-2022, 12:04 PM	#2
335dlci Lieutenant Colonel 286 Rep 1,595 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	P codes are useless. Recommend a better diagnostic tool.
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07-24-2022, 06:06 PM	#3
lnxguy Colonel 531 Rep 2,050 Posts Drives: 2018 540i xDrive. Join Date: Jun 2016 Location: Barrie iTrader: (1)	^--- Yup. Still sounds like you've got a major boost leak somewhere. __________________ '09 335D '18 540i xDrive
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07-25-2022, 04:59 PM	#4
nonford Private First Class 16 Rep 112 Posts Drives: 2018 540x Drive, 2019 X3 Join Date: Jun 2009 Location: New Mexico iTrader: (4)	Check your hose again (red one)...In fact you can stand outside of the vehicle, and if that hose is not on completely on, you will hear the hiss!!! Depending on how you put the band on, its hard to actually see the gap when it slips off. I was going nutz with mine and finally bought a new band that actually gripped that rubber better...no mo slip for me...
	Appreciate 0 Quote

07-28-2022, 03:22 PM	#5
pdx.e9d New Member 0 Rep 7 Posts Drives: BMW 335d e90 Join Date: May 2022 Location: Oregon USA iTrader: (0)	Yeah but I still have power in the higher end with no loss in boost or power. Only below 2500 rpm
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07-28-2022, 06:42 PM	#6
pdx.e9d New Member 0 Rep 7 Posts Drives: BMW 335d e90 Join Date: May 2022 Location: Oregon USA iTrader: (0)	I got BimmerLink and it reads the codes as this Attached Images
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07-29-2022, 12:46 PM	#7
lnxguy Colonel 531 Rep 2,050 Posts Drives: 2018 540i xDrive. Join Date: Jun 2016 Location: Barrie iTrader: (1)	Vac lines or pressure convertors. Google will help. __________________ '09 335D '18 540i xDrive
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07-29-2022, 11:05 PM	#8
pdx.e9d New Member 0 Rep 7 Posts Drives: BMW 335d e90 Join Date: May 2022 Location: Oregon USA iTrader: (0)	Intercooler is blown
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11-15-2023, 06:09 PM	#9
335dzlll New Member 2 Rep 15 Posts Drives: 2009 BMW 335d Join Date: Oct 2023 Location: WA iTrader: (0)	How did you know it was blown? I am fighting the same issue as you at the moment.
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11-15-2023, 08:12 PM	#10
BB_cuda Brigadier General 776 Rep 3,559 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	OP had a boost leak and his IC was culprit. Boost leak can come from lots of places. The hose connections is always best place to start hunting though. The upper seal in the red hose seems to last about 1 year. Best long term solution is to get away from the OE jubilee clips. I use ATM intercooler to allow the hoses and nice band clamps.
	Appreciate 0 Quote