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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 07-26-2012, 11:33 PM   #41
lsbmatt
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Join Date: Jun 2012
Location: bay area
Posts: 113
My Ride: 2002 vert m3 lsb smg
Quote:
Originally Posted by tehno0b View Post
I was driving on a traffic this afternoon at San Francisco and I'm going up hill, instead of breaking, I just hold my gas to hang the car from rolling backwards until this smell like cluth burning or tire burning came in, I thought it was the construction truck that's in front of me that spits out smoke in any angle but then I saw this Gear like light with ! in the middle (assuming SMG signal light) turned on. so I pulled on the curb and turned off my car, left it for 3 mins. then turned the car back on and the light was gone.. I drove back home (60miles) and it shifts and runs fine.. outside temp is at 78 btw.. so.. is it the SMG or the clutch? can I still drive my car back to frisco tomorrow or just leave it in the garage?
If you got money in the bank to fix your car if something happens, then drive to frisco. I would get it checked out first...
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Old 07-27-2012, 08:46 AM   #42
roadtrip1098
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Location: Winslow, ME
Posts: 356
My Ride: 04 M3 SMG LSB
Quote:
Originally Posted by tehno0b View Post
I was driving on a traffic this afternoon at San Francisco and I'm going up hill, instead of breaking, I just hold my gas to hang the car from rolling backwards until this smell like cluth burning or tire burning came in, I thought it was the construction truck that's in front of me that spits out smoke in any angle but then I saw this Gear like light with ! in the middle (assuming SMG signal light) turned on. so I pulled on the curb and turned off my car, left it for 3 mins. then turned the car back on and the light was gone.. I drove back home (60miles) and it shifts and runs fine.. outside temp is at 78 btw.. so.. is it the SMG or the clutch? can I still drive my car back to frisco tomorrow or just leave it in the garage?
That is extremely bad for your clutch. You will need your codes read to see what that actual cause of the light is, but it is most likely a clutch issue. Your car should be okay to drive, but never use the clutch to hold the car on a hill!
The issue in this case was most likely caused by your driving style.

In the owners manual it talks about the hill hold feature which can be used when transitioning from the brake to the gas, it uses the clutch to hold the car, but is meant only for the time it takes to move your foot onto the gas. It warns about excessive use causing premature wear and damage to the clutch.

Use your brakes, brake pads are cheaper to replace than a clutch.
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Old 07-28-2012, 05:21 PM   #43
M3driftking
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My Ride: M3 smg
Smg slave cylinder replaced and it's like it's been re born!! Smg box is 100%
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Old 07-28-2012, 05:48 PM   #44
lsbmatt
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Originally Posted by M3driftking View Post
Smg slave cylinder replaced and it's like it's been re born!! Smg box is 100%
How much did that cost you?

thanks
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Old 07-29-2012, 10:52 PM   #45
tehno0b
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ok =) Thanks a lot for the suggestions.. since I'm gonna have it checked, is it smart to have it replaced as well?
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Old 03-14-2013, 07:20 PM   #46
bgm3
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2004 M3- No start Condition- SMG Warning Light On

We have been experiencing a no start condition with the SMG light on and the trans stuck in gear. We were initially led to believe that the pump was failing and needed to be replaced, as it was not developing enough pressure to actuate the shift into neutral. I felt we had a top BMW tech work on the car but he still concluded that the pump was going to need to be replaced. After driving the car for months without issue the first hot day the car experienced we again went into a no start condition but this time the car was stuck in gear with the selector light reading N. I did not think this was temperature related and it seems that this problem is not exactly like any one else's, however, after reading it sounded similar enough to make me write a post. Can anyone offer any advice.
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Old 03-14-2013, 07:35 PM   #47
Misfit77
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Join Date: Jun 2012
Location: Denver
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Originally Posted by bgm3 View Post
We have been experiencing a no start condition with the SMG light on and the trans stuck in gear. We were initially led to believe that the pump was failing and needed to be replaced, as it was not developing enough pressure to actuate the shift into neutral. I felt we had a top BMW tech work on the car but he still concluded that the pump was going to need to be replaced. After driving the car for months without issue the first hot day the car experienced we again went into a no start condition but this time the car was stuck in gear with the selector light reading N. I did not think this was temperature related and it seems that this problem is not exactly like any one else's, however, after reading it sounded similar enough to make me write a post. Can anyone offer any advice.
Same thing happened to me all last summer. I tried everything except replacing the pump and nothing seemed to work. In spirited driving and rush hour with warmer temps, same thing over and over. Trans stuck in N and SMG light on, if it went into gear, as I was shifting it would go into N for about 30 seconds and then finally go to the next gear. If you research this, BMW mounted a poorly made temp sensor for the SMG too close to the manifold. Thus, after heating up too much over time, it would fail and tell the ECU the trans was overheating when it wasn't. A fail safe that was failing if you will. There is a DIY somewhere...basically you cut into the wire from the SMG Pump to the ECU and tap a 3ohm resistor into the line. The resistor would then trick the ECU into thinking the SMG was always a cooler temp. Only risk, is you will never know if your trans is overheating or not. I sold my E46 M3 and bought an E36 M3/4/5 FI but was planning on this mod. Search SMG resistor mod or something to that effect. If you can't find it I'll try and locate it.
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Old 03-14-2013, 07:57 PM   #48
wilsel
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My Ride: 05 AW M3 ZCP
Get the codes read. There's too many parts that fail. My clutch slave failed, and I'm glad the codes were read before I wasted $3k for a pump.
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Old 03-14-2013, 08:03 PM   #49
bgm3
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Hey there thanks so much for the feedback. Well it is certainly worth the effort of the try. Certainly better than throwing a pump into the fray isn't it ! How can you not love an M3 but this problem is really a pain ! Good luck with the E36.
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Old 03-14-2013, 08:06 PM   #50
bgm3
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I was told the codes for that circuit are the most vague in the entire system, I also replaced the clutch slave and a few other minor components such as the salmon relay, etc. and a few other things that do not come to mind. Thanks though !
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Old 02-11-2014, 12:52 AM   #51
M3 rebel
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Hi everyone - this light went on in my car but it still drives good - I tried resetting driving at 50 mph. Shift to neutral and pull both paddles but it didn't do anything. I disconnected the battery for about 10 minutes and it didn't reset. I also read about the relay, but I'm not sure where it is - is it the box under the hood with a bunch of cables in it? Excuse my ignorance....) can someone help me with this?
Thank you!


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Old 02-11-2014, 01:45 AM   #52
sakumaxp
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My Ride: 02 M3 convertible
Quote:
Originally Posted by M3 rebel View Post
Hi everyone - this light went on in my car but it still drives good - I tried resetting driving at 50 mph. Shift to neutral and pull both paddles but it didn't do anything. I disconnected the battery for about 10 minutes and it didn't reset. I also read about the relay, but I'm not sure where it is - is it the box under the hood with a bunch of cables in it? Excuse my ignorance....) can someone help me with this?
Thank you!


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yes, that box, the salmon relay isnt that much money i always have a spare relay in my glove box in a ziploc baggy. OR you can borrow an OBDII reader and pull the codes.
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Old 02-11-2014, 10:17 AM   #53
M3 rebel
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@sakumaxp- thank you for your reply; I'll have the codes checked and will keep a spare as it sounds like this is a common situation. Thank you-


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Old 06-13-2014, 01:16 AM   #54
Hilts64
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Join Date: May 2014
Location: Stevengae
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My Ride: BMW M3 E46 Coupe
Sorry to revive this thread, i'm having the same issues. Car is fine, untill irt gets warm and then the SMG light comes on (sometimes with the Engine light) and other times not. I had BMW check it out and the codes indicated a faulty bonnet switch sensor, of which the failsafe is for the car to drop into nuetral.
I'm having it replaced this tuesday, but after reading this thread (and yes i've changed the relay already), have a few other idea's to go by.
If anyone can advise where the SMG temp sensor is, i will also try that
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Old 06-14-2014, 02:00 AM   #55
iansevilla
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Join Date: Mar 2014
Location: San Diego
Posts: 275
My Ride: 2004 M3 Coupe
I have the same problem a few months ago. I found out from shop that clutch slave leak and that burnt the SMG pump causing it to malfunction. I decided to do a SMG to manual swap to eliminate that idiot light(gearbox light). I got my car yesterday after a month in the shop. So worth it!!!


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