10-11-2020, 01:18 PM | #1 |
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M2 N55 Limp mode/power loss
Ok decided to start a topic on this as I didn't come across anything specific like what I have.
So this issue will only happen in sport plus drive mode and manual gear shifting(dct), when doing an up shift full throttle it will engage the next gear then kill the power for a couple of seconds. Then it comes back in fine. But today it repeated the same issue, followed by a drivetrain fault on the Idrive display. I managed to pull a few codes off BimmerCode. All of which cleared and returned to normal function. To add, it's a 2018 LCI car, dct gearbox, no engine or exhaust mods, istep version 530. I know people will say take it to the dealership, but I do like to investigate/fix issues myself where possible. |
10-11-2020, 10:28 PM | #2 | |
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Second did you get the codes from bimmer code or bimmer link? I would advise gettings ISTA and following the diagnostic pathway, it is the only useful code scanner for bmw imo the rest will only try to achieve what ISTA can do. Third ISTEPS are F020_XX_XX_XXX format, the idrive displays an idrive fw version and really isn't as useful as an ISTEP number itself. But I do not see how ISTEP versions would be causing this issue. Overall since you have a 2018 m2 I think its best to just bring it back to the dealer and let them sort it out for you since you are still under warranty.
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10-12-2020, 03:17 AM | #3 | ||
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2. Sorry typo on my part, I used BimmerLink. But yeah ista would be a better diagnostic tool to use. 3. The istep was something like F020-18-07-530 can't remember exact no. Got this off esys. Thought I'd mention it as sometimes there are known software issues. Will attempt to diagnose further, if no luck then dealer it is. |
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10-12-2020, 03:57 AM | #4 | |
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If so you should have mentioned that, but the solution if indeed this was caused by the coding is to use ista and use the code function to reset each module back to how it was from the factory. Do not use code default.
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10-12-2020, 07:27 AM | #5 | ||
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Thought maybe the reports of more relaxed mdm in gts setting may help if it was this that was intervening and causing a throttle cut. |
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10-17-2020, 01:53 PM | #6 |
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Another limp mode today again in sport +
Also threw on drivetrain light. Some different codes this time. |
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10-17-2020, 05:34 PM | #7 | |
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I know you're aware that this is going to be said, but, TAKE IT TO THE DEALER. You're still under warranty and you need documentation in case this becomes an issue that cannot be fixed and requires legal action against BMW. I do Song-Beverly litigation in California (our version of Lemon Law), and you may have potential recourse under the Consumer Rights Act of 2015 if this issue is not resolved in the correct timeframe and number of repair attempts by the dealer. But your award (at least under California law) is reduced the longer your wait to take the vehicle into the dealership and inform them of this issue. Best of luck troubleshooting, but take it into the dealer ASAP and let them try to fix it. |
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10-17-2020, 05:57 PM | #8 | |
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OP just take it to the dealer. end of thread |
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10-17-2020, 07:03 PM | #9 | |
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As in the corollary US law, the dealership is entitled to attempt to repair the vehicle. Upon their failure, the consumer has the onus to prove that the defect was latent or otherwise existed within the first 6 months after purchase of the vehicle. So, literally everything I said was relevant to the OP. |
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10-17-2020, 07:11 PM | #10 | |
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It also sounds like OP might have done an ISTEP update at home along with some coding. So this one is directed at the OP. OP when did this issue start becoming apparent? Also did you update the ISTEP yourself or do anything that initially started to cause these issues? Because if you did an ISTEP update yourself and then the issues arose you are going to have extreme difficulties explaining why your ISTEP doesn't match what bmw has for your car, and if that caused the issue they could literally leave you out to dry no matter what any lawyer says or tries to do. But if none of this pertains to OP, then bring it to the dealer and let them fix it. There is a high likely hood they can fix it because bmw has really good diagnostics software to help pin the issue down - unlike alot of american cars that have no such equivalent to ISTA's test and diagnostics path ways.
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10-17-2020, 09:08 PM | #12 | |
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You're correct that the issue OP is suffering could be related to tuning, it may have just been a coincidental fault. At least under CA law (I do not pretend to be well versed in the specifics of the UK law), the manufacturer has the burden of proving that the failure should not be covered as a result of modifications. |
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10-17-2020, 09:31 PM | #13 | |
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But in all likelihood, it was the modifications to the car. |
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10-18-2020, 12:01 AM | #14 | |
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So if bmw is willing to replace these parts while under warranty and or the parts last longer than the warranty period and if the number of total failures of the same charge pipe model number during the warranty is low how can you attribute that to defect or normal wear and tear? Because everything will fail given enough time. The best example is Subaru with the EJ257 engine on the sti, WRX, and forester. These engines are absolute garbage imo, and have a terrible piston ring land failure issue due to the super brittle pison material and poor oem tune that knocks alot. You will see many of these engines fail and be replaced by warranty and if you call around and ask the owners of used EJ257 powered cars that are up for sale they will tell you it has a new engine more often than not. Yet subaru has never been sued successfully by any lemon law suit because the number of failures within warranty is small compared to the number of engines that fail out of warranty so it is hard to pin it on a design defect rather than neglect, lack of maintence or sheer bad luck - especially if the manufacturer will repair the motor without hassle under warranty. So imo don't rely on lemon laws unless you get an electrical issue (mechanical issues will likely never win lemon law suits as they are easy to diagnose and fix with new parts) that will never go away and keep coming up over and over - and that is not too common on bmws.
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10-18-2020, 12:46 AM | #15 | |
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The N54 also had numerous crank case ventilation pipe failures. So many, in fact, that the warranty has been extended to 10 years and 120,000 miles. And they redesigned the pipe with a different material and construction to avoid the failures. The Jeep compass had throttle bodies that would fail and cause a limp-mode. The Ford powershift transmission was subject mechanical failures and led to one of the largest class action lemon law suits in the last decade. The new Macan's transfer case has been blowing up and Porsche just extended the warranty on that. A number of new F-150s have had their AC compressors failing repeatedly. There are plenty of examples of mechanical failures that have led to successful lemon law claims. |
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10-18-2020, 02:13 AM | #16 |
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Ok, so just to clarify the istep version has not been altered to my knowledge.
I have done some coding bits nothing major. But yeah I know bmw are more aware of things these days and will find any excuse to get out of stuff. I use the car as a daily, it spends majority of its time in comfort or sport. It's only when I go for a weekend blast I'll flick it into sport plus. As this is the only drive mode the issue appears I'm not sure I could pinpoint how long it's been doing it for. |
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10-18-2020, 02:29 AM | #17 | ||
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