Is my M3 haunted?

jordantheodore · 02-02-2024, 10:35 AM

Hello.. I have a strange problem.. Typically after just 2 days of sitting. I start my 2015 bmw M3 and I get just about every code possible... My rpm gauge goes from 0-1k all while the car is steady idling. Check engine light, Drivetrain Malfunction, TPMS Failure, Limp Mode, Oil Low Warning, Hood open, ETC.... These codes all magically go away after driving the car a mile or two. Note- the car runs 100% normal and pops right out of limp mode like nothing happened except for the check engine light still being on...

I decided to take it to a shop that specializes in BMW coding because i figured either the car is damaged electronically or it just needs a new battery... the shop charged my car up and read the code and only saw an issue with the headlights - dynamic headlight function wasn't working properly (expected because I switched my non LCI lights for OEM IKON lights) anyway, guy said my battery just needed a charge and so after I got a full charge the car was fine and i went on my way... Until i let it sit another 2-3 days and the car was right back to its ways with somehow even more error codes this time! This is just an issue that's being caused by a dead battery... right?

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Groganrocket · 02-02-2024, 10:36 AM

Low voltage will cause some problems.

jordantheodore · 02-02-2024, 12:23 PM

yeah.. i guess it may be time for a new battery, ugh.

F82///M · 02-02-2024, 01:16 PM

It sounds like possible battery related problem. I'm curious what's the voltage reading before and after starting the engine. It should be 13.2V before and depending on conditions, it could be anywhere from 12.9 to 13.8V after.

M3SQRD · 02-02-2024, 01:27 PM

In agreement with everyone else. Try a new battery and go with an Antigravity Li-ion battery which is ~1/2 the cost of an oem Li-ion battery.

jordantheodore · 02-02-2024, 02:52 PM

I'll hook it up and check, good idea

jordantheodore · 02-02-2024, 02:53 PM

Quote:

Originally Posted by M3SQRD

In agreement with everyone else. Try a new battery and go with an Antigravity Li-ion battery which is ~1/2 the cost of an oem Li-ion battery.

I'll look into that. I appreciate the recommendation!

NSX2M4 · 02-02-2024, 03:26 PM

Definitely the spirit of Eva Braun.

02-02-2024, 10:35 AM	#1
jordantheodore Registered 0 Rep 4 Posts Drives: BMW F80 M3 - Audi A5 (daily) Join Date: Feb 2024 Location: Harrisburg PA iTrader: (0)	Is my M3 haunted? Hello.. I have a strange problem.. Typically after just 2 days of sitting. I start my 2015 bmw M3 and I get just about every code possible... My rpm gauge goes from 0-1k all while the car is steady idling. Check engine light, Drivetrain Malfunction, TPMS Failure, Limp Mode, Oil Low Warning, Hood open, ETC.... These codes all magically go away after driving the car a mile or two. Note- the car runs 100% normal and pops right out of limp mode like nothing happened except for the check engine light still being on... I decided to take it to a shop that specializes in BMW coding because i figured either the car is damaged electronically or it just needs a new battery... the shop charged my car up and read the code and only saw an issue with the headlights - dynamic headlight function wasn't working properly (expected because I switched my non LCI lights for OEM IKON lights) anyway, guy said my battery just needed a charge and so after I got a full charge the car was fine and i went on my way... Until i let it sit another 2-3 days and the car was right back to its ways with somehow even more error codes this time! This is just an issue that's being caused by a dead battery... right? Last edited by jordantheodore; 02-02-2024 at 10:37 AM.. Reason: typo
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02-02-2024, 10:36 AM	#2
Groganrocket Captain 380 Rep 990 Posts Drives: 2010 e90 335i and 2015m4 Join Date: Jun 2010 Location: NC iTrader: (0)	Low voltage will cause some problems.
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02-02-2024, 12:23 PM	#3
jordantheodore Registered 0 Rep 4 Posts Drives: BMW F80 M3 - Audi A5 (daily) Join Date: Feb 2024 Location: Harrisburg PA iTrader: (0)	yeah.. i guess it may be time for a new battery, ugh.
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02-02-2024, 01:16 PM	#4
F82///M Private First Class 78 Rep 138 Posts Drives: '18 M4 Join Date: Sep 2018 Location: Canada iTrader: (0)	It sounds like possible battery related problem. I'm curious what's the voltage reading before and after starting the engine. It should be 13.2V before and depending on conditions, it could be anywhere from 12.9 to 13.8V after.
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02-02-2024, 01:27 PM	#5
M3SQRD Major General 2342 Rep 5,802 Posts Drives: E92 M3,G20 330ix,F22 240iX,F82 Join Date: Jun 2009 Location: Mid-Atlantic iTrader: (11)	In agreement with everyone else. Try a new battery and go with an Antigravity Li-ion battery which is ~1/2 the cost of an oem Li-ion battery.
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02-02-2024, 02:52 PM	#6
jordantheodore Registered 0 Rep 4 Posts Drives: BMW F80 M3 - Audi A5 (daily) Join Date: Feb 2024 Location: Harrisburg PA iTrader: (0)	I'll hook it up and check, good idea
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02-02-2024, 03:26 PM	#8
NSX2M4 Major 1399 Rep 1,364 Posts Drives: 2019 M4 ZCP- RIVIAN R1S QUAD Join Date: Jun 2019 Location: FTL, FL iTrader: (1)	Definitely the spirit of Eva Braun. __________________ MGM Ext, SO int, Euro IKON, CS front lip, Carbon 1.5 diffuser, GTS/CS coding, M perf rear spoiler, & everything else STOCK. (Previous E39 and NA1 NSX owner) Those were the days!
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