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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions Does JB4 void warranty

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      10-23-2020, 11:13 AM   #1
bimmerMytlas
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Does JB4 void warranty

Hi guys,

I'm new M340I owner, got mine 3 days ago, but I'm a tunning maniac and even that the car is quite fast I already want to tunne it.
I stopped on JB4 as there are few videos in youtube of M340XI with JB4 doing 0-60 mph for 3.5 sec which is just amazing.
I really want to put a JB4 however the car have warranty until 02.2023 and I really don't want to lose it. Does any one have any idea if placing JB4 void warranty?

Thanks and have a nice weekend .
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      10-23-2020, 12:21 PM   #2
possible335i2008
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Quote:
Originally Posted by bimmerMytlas View Post
Hi guys,

I'm new M340I owner, got mine 3 days ago, but I'm a tunning maniac and even that the car is quite fast I already want to tunne it.
I stopped on JB4 as there are few videos in youtube of M340XI with JB4 doing 0-60 mph for 3.5 sec which is just amazing.
I really want to put a JB4 however the car have warranty until 02.2023 and I really don't want to lose it. Does any one have any idea if placing JB4 void warranty?

Thanks and have a nice weekend .
All tunes/piggy backs will void the power train warranty. If your ac goes out you will be ok but your engine pops or transmission goes then it's game over and you are paying the bill.
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      10-23-2020, 01:05 PM   #3
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Welcome and congrats on the new vehicle!

There are many other threads posted on this topic in this forum. I suggest doing a search and reading those
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      10-23-2020, 02:02 PM   #4
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Only if it's the root cause. Rules also change from country to country so I would look into that.

In CA, it must be proven by the manufacturer that the modification was the cause of the damage. So for example, if you suspension clunks and you have JB4, BMW cannot simply blame the JB4 and not help you. However, if you experience ecu issues, and repairs are required, this is where they will most likely ask you to pay out of pocket and possibly void the rest of your powertrain warranty.

The good news is that Dinan and Burger products have been proven and rarely cause issues. Take a look at the F30 forums, very rare for these products to damage something, the G20 is no different.
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      10-26-2020, 05:18 AM   #5
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Power train will be voided but lucky for you the jb4 leaves no trace of being ever installed, and you remove it if you blow something
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      10-26-2020, 05:31 AM   #6
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Quote:
Originally Posted by Antec800 View Post
Power train will be voided but lucky for you the jb4 leaves no trace of being ever installed, and you remove it if you blow something
Any tune is detectable if the dealership interrogate the DME. There will be manipulate graphs for air and fuel. It won't match an OEM car. Just because it can be hot swapped it doesn't make you immune. Given the choice between a new engine and blaming the customer the dealer will always establish the cause and may even blame the modification.
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      10-26-2020, 10:44 AM   #7
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again....
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      10-27-2020, 02:12 PM   #8
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Ye so pretty much no tunning for the next 5 years that's quite sad... I don't know why BMW don't offer tunning for their M cars
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      10-27-2020, 10:56 PM   #9
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They don’t change for boost changes or air/fuel changes, only thing they check for is dme flash counter so yes the jb4 will not be detected
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      10-27-2020, 11:50 PM   #10
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This is just a cut and paste with a couple minor additions of a response I shared a couple days back that generally touched on the same topic - hope this helps.

CliffNotes (I'm dating myself):
  • Any modification whether it be a 2 wire piggyback (JB+ etc...) a multi-wire piggyback (JB4, RaceChip etc...),a flash (Mission Performance, BM3, MHD etc...), coding (Bimmercode etc..), Lowering Springs (Dinan, H&R, Cobra etc...), Audio Upgrades (BavSound etc..), Intake (BMS, Injen etc...) and so on and so forth can potentially void the portion of your warranty that is linked to the modification. Now how each of these mods is detected is different but rest assured there is no hiding.
  • Is a flash pro-activly detected? Yes. Is a piggyback detectable after being removed? Physically No of course not it's not there anymore but does it leave tell tale signs that the dealer/BMW can detect if need be? Yes indeed (FASTA Data etc..)
  • Also there is no "pro-active" voiding of warranty for any of the aforementioned
  • That said I personally have zippo concerns about any of the aforementioned mods causing a failure on my car so it's something that wouldn't keep me up at night - this is just based on my own personal experience - others opinions will vary - all good

So at the end of the day and getting back to your question....can you do any modification that that will not be detected (either proactively or by reverse engineering)? No you can't (at least I can't think of one). Should you care? Up to you

Last edited by chenry; 10-28-2020 at 10:51 AM..
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      10-29-2020, 08:47 AM   #11
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It's not worth it I guess, I know those cars are strong but still something can defect in Engine/Transmission and I really don't wanna pay for it. I guess next 3-5 years the car will be stock.
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      10-29-2020, 10:54 AM   #12
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Does it depend on the dealership? Some dealers are more mod and tune friendly than others correct?
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      10-29-2020, 12:42 PM   #13
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Quote:
Originally Posted by TruthOne View Post
Does it depend on the dealership? Some dealers are more mod and tune friendly than others correct?
No that's the biggest fallacy, if the engine pops the claim will be sent to BMWNA who will run scans etc and determine the cause, your local dealer will only do what they are paid for.
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      10-29-2020, 12:43 PM   #14
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Quote:
Originally Posted by TruthOne View Post
Does it depend on the dealership? Some dealers are more mod and tune friendly than others correct?
It actually depends on the SA that you're dealing with, if that guy is mod friendly, you shouldn't have any big problems.
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      10-29-2020, 12:49 PM   #15
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Quote:
Originally Posted by cywing1119 View Post
Quote:
Originally Posted by TruthOne View Post
Does it depend on the dealership? Some dealers are more mod and tune friendly than others correct?
It actually depends on the SA that you're dealing with, if that guy is mod friendly, you shouldn't have any big problems.
That's only if the mod isn't the cause of the problem, no SA is going to risk their job for you to commit fraud. If you tune your car you will be responsible for any damage to the engine and transmission, now can you spend 10-20k on a lawyer and prove it wasn't the tune ok? But in the end you still paid for the situation. Unfortunately you have to pay to play and that's how it goes.

So
Tune = and engine/transmission goes boom = you pay money to fix or you commit fraud and get away with it (which is way harder to do now with all the tuner detection and data collection by BMW)

Tune= ac/battery goes bad you are all good
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      10-31-2020, 09:42 AM   #16
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Quote:
Originally Posted by possible335i2008 View Post
That's only if the mod isn't the cause of the problem, no SA is going to risk their job for you to commit fraud. If you tune your car you will be responsible for any damage to the engine and transmission, now can you spend 10-20k on a lawyer and prove it wasn't the tune ok? But in the end you still paid for the situation. Unfortunately you have to pay to play and that's how it goes.

So
Tune = and engine/transmission goes boom = you pay money to fix or you commit fraud and get away with it (which is way harder to do now with all the tuner detection and data collection by BMW)

Tune= ac/battery goes bad you are all good
That's the best explanation.. I think the dealer can be tune friendly but really if engine blow or transmission the investigation will be perform by BMW itself and they will find that you have tune the car which will result in they refusing to repair the car which will lead you doing all the repairs.

So in my case I got 3 years factory warranty here in Europe and after the 3 years I can pay 800 Euro for 2 years additional. Which leaves me 5 years bone stock .
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