Troubleshooting sudden mass fault codes

Indoril 135i · 01-15-2023, 12:26 PM

The other day while out driving my 135i the car suddenly went into limp mode without warning, with codes 27da, 281a, 281b, 2dd6, 2dd7, 2dd8, 36e2, 27e4, 2820 showing up when I scanned it after getting home. I’ve since noticed occasionally when I unlock the car the valvetronic servomotor clicks for a few seconds, so I’m planning on replacing it and the eccentric shaft. For the other codes- sign of faulty dme? Damaged harness somewhere?

Background on car- 2012 n55 135i with 72k miles, driven 1-2x a week. Up to date on maintenance with no other issues, previously MHD stage 2+ & fbo but all stock since getting smogged last year.

Indoril 135i · 01-15-2023, 07:03 PM

Something electrical was my first guess too, battery is only a few months old and I did test it afterwards, still good. All cables looked good visually besides the ground on the engine (had green corrosion), which I replaced. Also tested alternator which is functioning normally as well.

Indoril 135i · 01-22-2023, 02:19 PM

An update in case anyone else has similar issues in the future- all faults were caused by the valvetronic servomotor.

01-15-2023, 12:26 PM	#1
Indoril 135i Registered 2 Rep 4 Posts Drives: BMW 135i, Mercedes Benz CLK55 Join Date: Aug 2020 Location: Bay Area, California iTrader: (0)	Troubleshooting sudden mass fault codes The other day while out driving my 135i the car suddenly went into limp mode without warning, with codes 27da, 281a, 281b, 2dd6, 2dd7, 2dd8, 36e2, 27e4, 2820 showing up when I scanned it after getting home. I’ve since noticed occasionally when I unlock the car the valvetronic servomotor clicks for a few seconds, so I’m planning on replacing it and the eccentric shaft. For the other codes- sign of faulty dme? Damaged harness somewhere? Background on car- 2012 n55 135i with 72k miles, driven 1-2x a week. Up to date on maintenance with no other issues, previously MHD stage 2+ & fbo but all stock since getting smogged last year. Attached Images
	Appreciate 0 Tweet Quote

01-15-2023, 07:03 PM	#2
Indoril 135i Registered 2 Rep 4 Posts Drives: BMW 135i, Mercedes Benz CLK55 Join Date: Aug 2020 Location: Bay Area, California iTrader: (0)	Something electrical was my first guess too, battery is only a few months old and I did test it afterwards, still good. All cables looked good visually besides the ground on the engine (had green corrosion), which I replaced. Also tested alternator which is functioning normally as well.
	Appreciate 1 deleted_397282_c43ae5ea84151.00 Quote

01-22-2023, 02:19 PM	#3
Indoril 135i Registered 2 Rep 4 Posts Drives: BMW 135i, Mercedes Benz CLK55 Join Date: Aug 2020 Location: Bay Area, California iTrader: (0)	An update in case anyone else has similar issues in the future- all faults were caused by the valvetronic servomotor.
	Appreciate 0 Quote