HELP! 2012 BMW 528i N20

jbahr · 11-14-2020, 10:31 PM

Hello,

My car recently stopped working on me. Out of nowhere, it wouldnt start and check engine came on.
I got a buddy of mine to read the code and i got P1339 - "Camshaft Position Sensor 'B' Faulty Phase Position (Bank 1)".

I changed the camshaft position sensors and nothing changed. I also tried to start it with starter fluid but no change. The car cranks and the battery is getting 12v. The fuel pressure is good and the spark plug is good.

What else can I attempt to do?

The car will crank for ever and ever and not start.

Anything helps. Thank you.

judexromo · 12-08-2020, 12:13 PM

We have the same issue with the same engine/year! I finally found someone with the same issue online.

I replaced the 2 CP sensors, even swapped them with no help. Replaced the Crankshaft sensor(near the starter) with no help. Replaced the Tensioner and Serpentine Belt(due already) with no help.

I see an oil leak in the valve cover, I will replace the gasket next.

My timing belt is loose, which I suspect to be the culprit, but I will found out once I remove the valve cover. FCP Euro told me to check the Valvetronic eccentric shaft actuator which can cause electrical issues.

Engine runs but sluggish.

Any update on your P1339 issue. Let's help each other.

Handsomecore · 01-03-2021, 11:42 PM

Do you have guys have a bmw scanner ? I had this problem with a customers car and it was the VVT motor . Car was a 2015 528 n20 motor. car was cranking but it was a low compression crank if know that sound

azguy83 · 11-07-2021, 09:46 PM

Any updates on this p1339 issue?
I have a 2013 528i and has this code and just cranks and cranks and doesn’t start.
I changed the crankshaft sensor and camshaft sensors and still same…

Unspec · 11-09-2021, 10:42 AM

Given that it's a N20, my money is on engine jumping timing.

State · 01-31-2022, 07:10 AM

I have the same issue. My car is a 2012 bmw 528i xdrive. My car cranks and drives but after a mile or so a message pops up saying drivetrain malfunction and it makes a noise as if the bearing on my compressor was bad and it's so loud that I can hear it from inside the car and the people around me driving can hear as well. Any idea how to resolve this issue?? My car cranks and drives until the message of drivetrain malfunction pops up then the car loses compression a little. If I was going 60 mph it drops to about 50mph and ram goes up higher than normal and car does not have good compression.

11-14-2020, 10:31 PM	#1
jbahr Registered 2 Rep 1 Posts Drives: 2012 BMW 528i Join Date: Nov 2020 Location: CA iTrader: (0)	HELP! 2012 BMW 528i N20 - P1339 Camshaft Position Sensor Hello, My car recently stopped working on me. Out of nowhere, it wouldnt start and check engine came on. I got a buddy of mine to read the code and i got P1339 - "Camshaft Position Sensor 'B' Faulty Phase Position (Bank 1)". I changed the camshaft position sensors and nothing changed. I also tried to start it with starter fluid but no change. The car cranks and the battery is getting 12v. The fuel pressure is good and the spark plug is good. What else can I attempt to do? The car will crank for ever and ever and not start. Anything helps. Thank you.
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12-08-2020, 12:13 PM	#2
judexromo Registered 0 Rep 1 Posts Drives: 2012 BMW 528i xdrive Join Date: Sep 2016 Location: MD iTrader: (0)	Same issue We have the same issue with the same engine/year! I finally found someone with the same issue online. I replaced the 2 CP sensors, even swapped them with no help. Replaced the Crankshaft sensor(near the starter) with no help. Replaced the Tensioner and Serpentine Belt(due already) with no help. I see an oil leak in the valve cover, I will replace the gasket next. My timing belt is loose, which I suspect to be the culprit, but I will found out once I remove the valve cover. FCP Euro told me to check the Valvetronic eccentric shaft actuator which can cause electrical issues. Engine runs but sluggish. Any update on your P1339 issue. Let's help each other.
	Appreciate 0 Quote

01-03-2021, 11:42 PM	#3
Handsomecore Private 26 Rep 61 Posts Drives: 2007 328i sedan Join Date: Apr 2013 Location: Bronx ny iTrader: (0)	Do you have guys have a bmw scanner ? I had this problem with a customers car and it was the VVT motor . Car was a 2015 528 n20 motor. car was cranking but it was a low compression crank if know that sound
	Appreciate 0 Quote

11-07-2021, 09:46 PM	#4
azguy83 New Member 0 Rep 5 Posts Drives: BMW 528i 2013 / X5 35i 2017 Join Date: Feb 2013 Location: Tulsa, OK iTrader: (0)	Any updates on this p1339 issue? I have a 2013 528i and has this code and just cranks and cranks and doesn’t start. I changed the crankshaft sensor and camshaft sensors and still same…
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11-09-2021, 10:42 AM	#5
Unspec Colonel 1300 Rep 2,590 Posts Drives: 2015 BMW 535xi Join Date: Apr 2019 Location: DMV iTrader: (1)	Given that it's a N20, my money is on engine jumping timing. __________________ 2015 BMW 535xi Bootmod3 Stage 2 \| ER charge pipe \| ER Catted DP \| Remus Exhaust \| Gplus FMIC \| KW V3 \| Turner Monoball thrust arm bushings \| Wallet regrets ISTA VM Setup/Tutorial
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01-31-2022, 07:10 AM	#6
State Registered 0 Rep 1 Posts Drives: Bmw 528i xdrive Join Date: Jan 2022 Location: MD iTrader: (0)	P1339 I have the same issue. My car is a 2012 bmw 528i xdrive. My car cranks and drives but after a mile or so a message pops up saying drivetrain malfunction and it makes a noise as if the bearing on my compressor was bad and it's so loud that I can hear it from inside the car and the people around me driving can hear as well. Any idea how to resolve this issue?? My car cranks and drives until the message of drivetrain malfunction pops up then the car loses compression a little. If I was going 60 mph it drops to about 50mph and ram goes up higher than normal and car does not have good compression.
	Appreciate 0 Quote