Check Engine Light Mystery Plagues Range Extended i3 models In The U.S.

BMW i | June 10th, 2014 by 4
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Many people that order the range extender option on the i3 do so because they just aren’t comfortable with the BEV i3’s 81 mile EPA …

Many people that order the range extender option on the i3 do so because they just aren’t comfortable with the BEV i3’s 81 mile EPA range rating. Personally I really didn’t want it but my driving demands dictated that I really needed it. If the i3 had 15% to 20% more range I would not have ordered the REx and I suspect there are a lot of others that would fall into the same category as me on this.

We know it’s there and we aren’t particularly proud of hauling around the oil, gasoline and the rest of the muck that goes with it. So the last thing we really want is to be constantly reminded that we have a gasoline engine in our shiny, new electric cars. Unfortunately that is exactly what is happening.

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The day after a picked up my car the check engine light (CEL) illuminated for a few hours and then shut off. I called my dealer as soon as it went off and was told to bring it in so they could check it out. Then when it turned off I called back and was told to monitor it, but it wasn’t necessary to bring it in unless it comes on again. I then dropped my car off to be wrapped so I wouldn’t be driving it for a week. During that time other range extended i3s were getting delivered and just like what I observed, within a day many other people were reporting the same thing. Some took their car back to the dealership where they down landed and cleared the fault codes and released the cars. The dealers don’t yet have any answers and are basically saying there is nothing wrong with the cars and the light is coming on erroneously. Some people were told that if in fact there was indeed a problem with the engine the CEL would blink, not just light up and stay on as what is happening.

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Unfortunately I got a flat tire last week and needed to get towed to my dealer so it was a good time to have the CEL looked at. The service manager said they pulled the codes and reset everything but didn’t see any problem. Unfortunately the light didn’t go on while they had it, but I doubt that would have made any difference. I’ve had reports from others that did indeed bring their car in with the light on and the dealer was just as stumped as to the cause. I also find it odd that the car’s Check Control reads “All systems OK” even when the light is on. This offers more evidence that there really may not be any physical problem, but perhaps just some software bug that is turning the light on.


If that’s the case, then why haven’t we seen this reported for the past five months or so that the i3 REx has been available in Europe? I suppose the cause could be rooted to the fact that the US i3 REx operates differently than the European version, with restrictions on how and when it operates. To complicate things even more, only weeks before the REx was to launch in the US, BMW had to restrict the size of the gas tank from 2.4 gallons to 1.9 gallons. This meant the existing built cars needed to have some kind of retrofit done post-build. Could that work have triggered some kind of software conflict which causes the CEL? That would certainly explain why BMW hadn’t seen this issue before and why every i3 REx (that I know of at least) in the US has this issue.


I know for a fact the engineers at BMW of North America are working on this. Hopefully they will get it resolved soon. I expect we’ll get a phone call at some time asking us to bring our cars in for a software update, but who knows, maybe there actually is a physical problem it is detecting. However at the moment, nobody from BMW or the dealers seem to be able to provide any real answers. If I don’t hear anything soon, I may be forced to just fix it myself!

[Source: bmwi3blogspot]

4 responses to “Check Engine Light Mystery Plagues Range Extended i3 models In The U.S.”

  1. Harold Sogard says:

    Totally unfair that Tom of all people should be stuck with this problem, That said, I would add this to my (ever lengthening) list of reasons why the REx version of the i3 is just a mistake and not worth the extra cost.

  2. Yasin says:

    Hello. I left the dealership even with the check engine light on when picking up my REx. Once home, use an OBDII tool to reset and you’re good to go. The are 2 common errors being generated. They have to do with the short run time that the Range Extender runs for potentially one of the first times in a while. The other one I got (have not heard from anyone else) was related to the Air conditioning compressor. The OBDII codes have not yet been released so you need to use a program like Rheingold for diagnosis. But fear not! BMW will have this fixed shortly, and then for all other potential i3 buyers out there, the fix will already be applied to your car before it is released.

  3. Paul Durham says:

    I too had the problem on an i3 REx we’ve had for less than a week. The dealer, stumped at first, checked with BMW North America and was told it was a software problem with the U.S. cars and that a corrected version of the software would be available in approximately the next month. The car operates normally, and the CEL is on all the time at this point.

  4. Timothy Harwood says:

    Same issue here. Apparently occurred in the first 600 or so of RExs produced before it was discovered. Took it to a local dealer and the i3 tech was aware of the bulletin but this was the first i3 he had worked on for a customer. Took them a while to download the update from BMW NJ so got a loaner overnight and took them all next day to get the download right then upload it to the car (not a car issue, but an internet issue for them). They got it fixed right, however, and I’m back on the road without a recurrence.

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