Μ4 - christmas tree

[ChrisSTR]

I had a kinda bizarre problem and I want your view in the subject.

After 2 months in the garage, I started up my M4 in order to take it a ride. The engine started like a charm but I got 3 fault messages: Open Hood, fault in the airbag and problem with the gearbox. At the same time the rpm and km/h wasn't working. I selected a gear, I "heard" that I took it and i got away.

So the car was working flawless except these 3 messages stuck in there. Ι drove it for like 30 minutes and all of a sudden everything came to normal. And no fault codes in the OBDII after that. Pretty annoying...

Anyone with the same experience? (specs: 2015 - 16'000 miles)

[N1rve]

Originally Posted by ChrisSTR

I had a kinda bizarre problem and I want your view in the subject.

After 2 months in the garage, I started up my M4 in order to take it a ride. The engine started like a charm but I got 3 fault messages: Open Hood, fault in the airbag and problem with the gearbox. At the same time the rpm and km/h wasn't working. I selected a gear, I "heard" that I took it and i got away.

So the car was working flawless except these 3 messages stuck in there. Ι drove it for like 30 minutes and all of a sudden everything came to normal. And no fault codes in the OBDII after that. Pretty annoying...

Anyone with the same experience? (specs: 2015 - 16'000 miles)

Might be low battery issue. Try keeping it on battery tender if you are going to not touch it for 2 months. That's a pretty long time.

[Kilabyte]

Originally Posted by N1rve

Might be low battery issue. Try keeping it on battery tender if you are going to not touch it for 2 months. That's a pretty long time.

Aaand a pretty expensive replacement as well if you ruin it.

I'd never keep a car stored that long without a battery tender connected to it.

[agentrnge]

+1 vote for low battery issues causing this.
This quarantine is going to kill/drain a lot of batteries.

[ChrisSTR]

That's what I was thinking... The downside is that I don't have acces to electricity in my garage, so I think I need to take it for a drive now and then...

[X.X.I.V]

Originally Posted by ChrisSTR

That's what I was thinking... The downside is that I don't have acces to electricity in my garage, so I think I need to take it for a drive now and then...

Same here.
Does anyone have a solution for this beside removing the battery and keeping it in the house on a tender?

[N1rve]

Originally Posted by X.X.I.V

Same here.
Does anyone have a solution for this beside removing the battery and keeping it in the house on a tender?

Drive it.

[ChrisSTR]

Originally Posted by X.X.I.V

Same here.
Does anyone have a solution for this beside removing the battery and keeping it in the house on a tender?

I don't know how easy is to take off/put it on... But I think given the circumstances it's the only solution.

[F82///M]

Originally Posted by X.X.I.V

Same here.
Does anyone have a solution for this beside removing the battery and keeping it in the house on a tender?

You could just disconnect negative terminal and leave it in the car for few months, it won't drain. Unlatch rear seats before closing the trunk because it won't open without connected battery. You'll have to climb in trough the cab to reconnect. Before doing this, battery voltage should be 13.2V with engine off. In case no voltmeter device available use cluster test mode. Test 11 shows voltage and it's pretty accurate.

On the other note, I wouldn't suggest doing this often but it will work.
Depending on idling laws in your area, driving isn't really necessary. Idling for 5-10 minutes every 14 days will keep the battery charged. After startup hold the brake pedal for about 7 seconds and it's activated. It doesn't say that in the owners manual because of local laws and environment. They're still using the old suggestion about driving the vehicle for 30 minutes which is practice for wet and some AGM style batteries.

F8X system charges battery mostly when there's no load on the engine.
Coasting or decelerating gives the biggest burst, then it goes braking and idling.
It's hard to give exact percentages since this system takes into the account outside temperature and current battery state of charge.

[DanMpower]

Definitely a low battery issue, my E92 M3 went bat shit crazy when the battery was low/bad. Fortunately a new battery for it was only $250. Too bad it's like 6x more for the F80.

[ChrisSTR]

Originally Posted by F82///M

You could just disconnect negative terminal and leave it in the car for few months, it won't drain. Unlatch rear seats before closing the trunk because it won't open without connected battery. You'll have to climb in trough the cab to reconnect. Before doing this, battery voltage should be 13.2V with engine off. In case no voltmeter device available use cluster test mode. Test 11 shows voltage and it's pretty accurate.

On the other note, I wouldn't suggest doing this often but it will work.
Depending on idling laws in your area, driving isn't really necessary. Idling for 5-10 minutes every 14 days will keep the battery charged. After startup hold the brake pedal for about 7 seconds and it's activated. It doesn't say that in the owners manual because of local laws and environment. They're still using the old suggestion about driving the vehicle for 30 minutes which is practice for wet and some AGM style batteries.

F8X system charges battery mostly when there's no load on the engine.
Coasting or decelerating gives the biggest burst, then it goes braking and idling.
It's hard to give exact percentages since this system takes into the account outside temperature and current battery state of charge.

Cool information there! Thanks!How do I acces TEST 11?

[F82///M]

Originally Posted by ChrisSTR

Cool information there! Thanks!How do I acces TEST 11?

It works with engine on and when driving as well. It's always activated with long press of odo reset button and in F series each time it has to be unlocked. Video shows only system test, when unlocked it's possible to see rest of the read outs.

[ChrisSTR]

Originally Posted by F82///M

It works with engine on and when driving as well. It's always activated with long press of odo reset button and in F series each time it has to be unlocked. Video shows only system test, when unlocked it's possible to see rest of the read outs.

Thanks a lot mate!! You've been the most helpful!!