[JJ312]

any body know how to fix Rear Right (passenger side) Turn Signal error?
(it blinks really really fast, and the error message pops up on the display.)


weird thing is, it's not always 100% problem.
it blinks really fast every once in a while, and magically goes away by itself.

FYI, rear left (driver side) turn signal had the sama problem about 2 years ago, while it was still under the warranty.
I took my car to the service center, and they changed the entire part.

Now that warranty is done, I'm looking to fix the problem myself.

[Al Bundy's Dodge]

There are a couple threads on this…just do a search.


Option 1: remove tail light, clean out wire harness/connection
Option 2: code out bulb check
Option 3: replace tail light


There are only like 3 screws that secure the housing unit, so it's super easy to remove and inspect.

[F87_M2SH]

Originally Posted by JJ312

any body know how to fix Rear Right (passenger side) Turn Signal error?
(it blinks really really fast, and the error message pops up on the display.)


weird thing is, it's not always 100% problem.
it blinks really fast every once in a while, and magically goes away by itself.

FYI, rear left (driver side) turn signal had the sama problem about 2 years ago, while it was still under the warranty.
I took my car to the service center, and they changed the entire part.

Now that warranty is done, I'm looking to fix the problem myself.

I had the same problem took off Taillight and cleaned connections it worked since then

[MrOhnoez]

While I had my car for 2 years the taillights were replaced 3 times by BMW for this issue.
very common.

[chmura]

What’s the reason for the issue? My buddy replaced his tail light under warranty a few months ago. My M2c is ending its warranty in less than a month.

[Silverlining_m2]

I fixed mine by not using them

Just kidding. I just had the error for the left turn signal, and it disappeared after stopping and starting the car again. A friend who works at the dealership told me bmw has even goodwilled this repair because it's a known issue with f87 and f22.

[chris719]

Originally Posted by chmura

What’s the reason for the issue? My buddy replaced his tail light under warranty a few months ago. My M2c is ending its warranty in less than a month.

Plenty of argument in other threads, but most likely a design flaw in the tails. Once mine fail I will tear them apart and tell you all what's wrong. However, they are cheap enough that it might not be worth fixing because coding out the bulb check gets you quite some time, and once it does fail it's like $200.

[speedy_ryan]

I started getting the same issue recently :/

[SEAT TIME RULES]

I'm getting the Error as well on my 2020 with 18K on it.

Every time I restart the car it goes away but then will pop back in months later

[pete888]

On bimmercode, this setting fixed it for me

[steve457]

Originally Posted by pete888

On bimmercode, this setting fixed it for me

Unfortunately, that setting does not truly fix the problem. It will make it so that the error message does not get displayed on your dashboard when the turn signal has a problem (will be really dim and almost non visible). This is according to information from the many other threads on this subject. I don't think the true root cause of the problem has ever been discovered at this point.

[omasou]

Dealer just replaced the entire right rear light under warranty.

Mine would reset with restart but come up again when I signal right.

Don't both referencing the SB as that was only for the OG M2

[JJ312]

checked some youtube videos on how to convert pre-LCi taillight to LCi taillight.
seems that voltage output needs to be changed to 13.7 in Bimmercode expert mode.

I checked my Bimmercode, and it's set on 100% for voltage.

has anybody experienced if turn signal error is fixed if changing the voltage output from 100% to 13.7?

[Poochie]

Originally Posted by JJ312

checked some youtube videos on how to convert pre-LCi taillight to LCi taillight.
seems that voltage output needs to be changed to 13.7 in Bimmercode expert mode.

[COLOR="DarkRed"]I checked my Bimmercode, and it's set on 100% for voltage.[/COLOR]

has anybody experienced if turn signal error is fixed if changing the voltage output from 100% to 13.7?

Leave it at 100%.

The taillight's circuit board has in-line resistors that regulates the exact amount of current flowing to the specific LED, regardless of how much juice is pumping from the rear electrical module - 13.7% or 100%.

The power from the module are modulated through these resistor before actually getting to the LED tail lights themselves, making sure there is a safe, steady and a specific amount of voltage is being provided to the LEDs.

The Pre-LCI taillights had incandescent bulbs and the LCI had LEDs, so without getting too technical, they don't operate the same, voltage wise.

[JJ312]

Originally Posted by Poochie

Leave it at 100%.

The taillight's circuit board has in-line resistors that regulates the exact amount of current flowing to the specific LED, regardless of how much juice is pumping from the rear control module - 13.7% or 100%.

The power from the module goes through these resistor before actually getting to the LED tail lights themselves, making sure there is a safe, steady and a specific amount of voltage is being provided to the LEDs.

The Pre-LCI taillights had incandescent bulbs not LEDs, so without getting too technical, they don't operate the same, voltage wise.

awesome. thanks for the info.
I'll leave them at 100% as is.


I guess it's time to take the taillights out and clean them
while at it, time to see if any of the wires are burnt or not.

[Poochie]

Originally Posted by JJ312

awesome. thanks for the info.
I'll leave them at 100% as is.


I guess it's time to take the taillights out and clean them
while at it, time to see if any of the wires are burnt or not.

You're welcome.

The pin connectors in the wire harness are made out of aluminum, they don't rust or corrode, especially on a fairly new vehicle.

I mentioned it ad nauseam already in other threads and have truly ran out of way of saying it but once again, this is not a hardware issue; mismatched programming/coding is the culprit. The warm/cold incandescent "bulb checks" for the turn signal needs to be disabled.

https://www.bimmerpost.com/forums/sh...php?p=28941707

[NEfan508]

2019 built February: Dealer changed units, they have internal bmw notes about this issue (I think) with a code on the dash helps justify replacement (updated units)

First was drivers side 2021 then passenger spring 2022, all @ no charge and with a nice loaner (3-4 days each time)

It's a gremlin bmw is aware of, just talk to your SA before you drop it off, one store told me they can't do anything if the issue doesn't happen when it's in their hands the other said a code listed will help but not needed for replacement?!?

Guess what place I took her in?

[chris719]

Originally Posted by Poochie

You're welcome.

The pin connectors in the wire harness are made out of aluminum, they don't rust or corrode, especially on a fairly new vehicle.

I mentioned it ad nauseam already in other threads and have truly ran out of way of saying it but once again, this is not a hardware issue; mismatched programming/coding is the culprit. The warm/cold incandescent "bulb checks" for the turn signal needs to be disabled.

https://www.bimmerpost.com/forums/sh...php?p=28941707

Pins on connectors are NEVER made of aluminum. They are phosphor bronze, brass, or copper, plated with nickel/tin or tin if white metal appearance and gold if gold. Aluminum is soft and oxidizes instantly when exposed to air. Let
me know how conductive aluminum oxide is. These connectors can easily have increased contact resistance without visible oxidation, especially since the contacts wipe when you pull the connector out to inspect. I’m not saying that’s the issue, but it helps to be informed.

Plenty of people have used the coding and eventually had the issue come back. It’s a bandaid and not a fix. Clearly a hardware issue. You should save your breath - we appreciate you pointing out the coding that can buy time, but it’s clearly not the solution.

[Poochie]

Originally Posted by chris719

Clearly a hardware issue

Well there you go, I guess you have all the answers then.. 👍🏻

[E21-myfirstlove]

I had this problem, on both sides right or left. Randomly. I used to bimmer code to code out the check. It's been about five months and haven't had an issue yet.

[Rk-d]

I had the same problem shortly after getting my car earlier this year. I had my taillight replaced without resolution and then later the REM module which has resolved the problem to date.

[BlacMacJac]

Is removal of the light housing to check/clean the connection as simple as the two bolts hidden behind the small 'doors' to the inside of each light? Or is there more to it?

I know this might not be the solve, but the odd inconsistency of how my light does/does not present the error just makes me curious to look. thanks.