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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Jun-19-2017, 05:41:54 AM   #1
OEMaddict
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Angry More SMG "dropping out of gear at high RPM" posts

So I finally have another problem with my SMG M3: when I'm shifting gears at high RPM and WOT, the gear indicator will blink for a few seconds, until I let go of the throttle, otherwise the car would just coast. If I keep holding throttle while the gear is blinking, it would push me into the last gear I was in, and the SMG cog light will go up. At that point I'd no longer be able to go into that flashing gear until I turn off the car, and subsequently the light will turn off.

ex) shift at 6k rpm 3rd gear to 4th, "4" flashes and no power to wheels. If I hold throttle, car goes back into 3, SMG Cog light on, can't go back to 4th until car off. If I let go of throttle, 4th gear engages.

I've found a TON of threads that talk about this issue, but the answers all seem to bounce around from compression springs to the gear position sensor. If I drive like a granny the problem seems to resolve itself, but that's an obvious stopgap. I'm trying to look for my OBDII reader for the generic code but for the life of me, cannot find it... anyone that has had my exact same symptoms fix the problem, and what did they replace? And if you brought it to a shop to get it done, how much was it to replace?

Last edited by OEMaddict; Mon, Jun-19-2017 at 05:47:11 AM.
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Old Mon, Jun-19-2017, 06:26:35 AM   #2
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Default Re: More SMG "dropping out of gear at high RPM" posts

Yea definitely sounds like compression springs.
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Old Mon, Jun-19-2017, 08:02:15 AM   #3
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Default Re: More SMG "dropping out of gear at high RPM" posts

Definitely sounds like compression springs. I just did mine last week.

I asked some good questions, look at my post history it might help.
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Old Mon, Jun-19-2017, 05:25:18 PM   #4
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Default Re: More SMG "dropping out of gear at high RPM" posts

^^^ Third vote, classic symptoms of compression springs. There are one or two that are primary culprits, but I'd do all if I were going to go to the trouble.
Keep your caps that hold them in, seems one of the listed part numbers is often wrong, or folks look it up wrong, can maybe re-use the old one if this happens.

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Old Mon, Jun-19-2017, 07:34:10 PM   #5
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Default Re: More SMG "dropping out of gear at high RPM" posts

Thanks for the input guys. I have since scanned the car and got this back.

http://i.imgur.com/49FV6wZl.jpg
48 gear not changable

http://i.imgur.com/Wt0qG9M.jpg
30 SMG: Gear cannot be engaged (OBDII: P1756)

Running SMG adaptation now.

EDIT: SMG adaptation failed in both INPA and DIS/GT1.

Results:
STATUS: the shift path (gear) end positions for odd gears are too different

Last edited by OEMaddict; Tue, Jun-20-2017 at 08:41:13 AM.
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Old Tue, Jun-20-2017, 08:41:29 AM   #6
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Default Re: More SMG "dropping out of gear at high RPM" posts

Sorry for the excessive updates, just wanted to report in again.

Based on the adaptation failure, error codes, and symptoms I've been facing, I also believe it's an almost telltale sign of a compression spring failure. Thing is, I have work for the next few days and will have to commute quite a bit with these symptoms, and will have to work out the best place to get this job done. I can technically still drive the car even with this in mind right, as long as I drive the car like I would a Prius?
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Old Tue, Jun-20-2017, 08:51:06 AM   #7
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Default Re: More SMG "dropping out of gear at high RPM" posts

Watch out about the SMG adaptation.
It might be successful, but it adapts with a broken spring. The consequence is that it still blinks when shifting under load, but it also makes that the car won't engage any gear once your replace the spring.

On the car I fixed this issue on, I too first tried the SMG adaptation.
Then I replaced the spring and it would not engage any gear since the adaptation was run with a broken spring.

So do not panic if that happens to you.
Replace the spring, run the adaptation, and drive your car.
Then you'll know if you fixed the issue.
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Old Tue, Jun-20-2017, 09:00:19 AM   #8
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Default Re: More SMG "dropping out of gear at high RPM" posts

Quote:
Originally Posted by Flow View Post
Watch out about the SMG adaptation.
It might be successful, but it adapts with a broken spring. The consequence is that it still blinks when shifting under load, but it also makes that the car won't engage any gear once your replace the spring.

On the car I fixed this issue on, I too first tried the SMG adaptation.
Then I replaced the spring and it would not engage any gear since the adaptation was run with a broken spring.

So do not panic if that happens to you.
Replace the spring, run the adaptation, and drive your car.
Then you'll know if you fixed the issue.
Will do. I thought that if the GPS was the culprit, an SMG adaptation would do the trick (it didn't). Thanks.

I also noticed, just now, that there are three compression springs, one for 1-2, 3-4, and 5-6. Would compression springs still be the problem if I'm dealing with this across practically all gears? I've had blinking gears on pretty much every gear, I haven't seen it limited to one set.
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Old Tue, Jun-20-2017, 09:13:26 AM   #9
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Default Re: More SMG "dropping out of gear at high RPM" posts

Only one spring solved the issue for me.
I did not check the others.
Issue was on all the gears too.
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Old Thu, Jun-22-2017, 04:26:57 AM   #10
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Default Re: More SMG "dropping out of gear at high RPM" posts

^+1 on the springs.

Sounds like almost the same symptoms I had except I didn't have to turn off the vehicle
in order to go back up through the gears.

Checkout my thread I ended up replacing 2 of my springs which costed less than $3 from what I remember. Took it to a close friend of mine who got it done in Santa Ana at his residence so if you don't have an indy shop or want a quote from him send me a PM.

http://www.m3forum.net/m3forum/showthread.php?t=479149
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Discussing More SMG "dropping out of gear at high RPM" posts in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)