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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 09-02-2015, 02:43 PM   #1
Senna-Man!
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E46 M3 SMG Pump Mechanics?

Hello Everyone,

First Post here!

I purchased a 2002 M3 a few months back and now having the dreaded changing gears to '0' neutral. Is a on and off thing. The BMW shop says it needs to be replaced and will cost 4K

That said, I'm not surprised as it is an M series. I have read about the changing the Relay, the SMG sensor Mod.

I have decided to purchased a brand new pump, except nobody has it in stock at the places where the price is $2000-$2400.

Now, last night while taking Uber service, the driver from Armenia, mentioned he has a 2003 M3 and had the SMG problem. He said he got it fixed. Fixed, I said, I didn't know you can get it fixed.
He stated that in Armenia it was to expensive to buy the replacement, they fix them for much cheaper than purchase it new.

Question, anybody knows where to find a Mechanic in Los Angeles area that can fix the SMG Pump? The San Fernando Valley area even better?
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Old 09-02-2015, 05:39 PM   #2
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Nobody with a M3 with similar situation?
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Old 09-02-2015, 06:13 PM   #3
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http://www.invasionautoproducts.com/01bmwm3smgpu.html

They sell rebuilt SMG pumps for a lot cheaper than a new unit. They may also rebuild yours.
They're located in North Hollywood. Give them a call.
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Last edited by 6th Element; 09-02-2015 at 06:13 PM.
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Old 09-02-2015, 06:15 PM   #4
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http://www.m5board.com/vbulletin/e60.../360386?page=1

How handy are you?
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Old 09-02-2015, 06:16 PM   #5
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By the way, dude in that thread is looking for a failed pump to try to fix. Yes it was last year but worth a shot.
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Old 09-02-2015, 06:27 PM   #6
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Not very haha! I think I tried calling them a few weeks ago. Rang and rang and nobody responded for two days. So I gave up with them. I will tray again
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Old 09-02-2015, 06:30 PM   #7
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Quote:
Originally Posted by 6th Element View Post
http://www.invasionautoproducts.com/01bmwm3smgpu.html

They sell rebuilt SMG pumps for a lot cheaper than a new unit. They may also rebuild yours.
They're located in North Hollywood. Give them a call.
My take on this rebuilds is that with a new one you get 2 years warranty if I recall vs just a few months

But worth a shot at calling them
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Old 09-02-2015, 06:32 PM   #8
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Originally Posted by Senna-Man! View Post
My take on this rebuilds is that with a new one you get 2 years warranty if I recall vs just a few months

But worth a shot at calling them
I think they have an unlimited miles, 1 year warranty on their rebuilt units. Call them and ask about options to rebuild your own pump. Worth a try.
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Old 09-02-2015, 06:33 PM   #9
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Originally Posted by 6th Element View Post
I think they have an unlimited miles, 1 year warranty on their rebuilt units. Call them and ask about options to rebuild your own pump. Worth a try.
Thanks man! You are very persuasive!

Will update!
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Old 09-02-2015, 06:35 PM   #10
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Originally Posted by Senna-Man! View Post
Thanks man! You are very persuasive!

Will update!
Good luck! In for update
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Old 09-02-2015, 06:43 PM   #11
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I called the Guy from that link, and talked to a gentleman with a thick Russian accent.

So he said that he cant check the "Pressure Switch". So in that case, what should I do? Any thoughts?

Last edited by Senna-Man!; 09-02-2015 at 06:44 PM.
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Old 09-02-2015, 06:46 PM   #12
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Well do you have any ideas as to what has failed on the pump? The hydraulic unit or the pressure accumulator?
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Old 09-02-2015, 06:55 PM   #13
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So I bought the car recently, I talked to the BMW service guy that was taking care of it for the past 3-4 years. He said that the SMG Pump needed to be replaced. He did not specified if the Pressure pump is the problem.

My problem started when I was driving and from the 3rd Gear it would go to neutral. It happen on a very hot day in LA. and hour later it ran again and then happened again 10 minutes later, Had to call triple A to tow it. Next day it was changing gears again.

The other day, I tested it at night, and worked for about 10 min then I got the same gear skipping. The past 2 days has been working but only testing it a few minutes at a time afraid to get stranded.

Clearly the Service guy saw that something needed to be replaced, so could it be a burned motor? Or the Sensor going bad?
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Old 09-02-2015, 07:00 PM   #14
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Originally Posted by Senna-Man! View Post
So I bought the car recently, I talked to the BMW service guy that was taking care of it for the past 3-4 years. He said that the SMG Pump needed to be replaced. He did not specified if the Pressure pump is the problem.

My problem started when I was driving and from the 3rd Gear it would go to neutral. It happen on a very hot day in LA. and hour later it ran again and then happened again 10 minutes later, Had to call triple A to tow it. Next day it was changing gears again.

The other day, I tested it at night, and worked for about 10 min then I got the same gear skipping. The past 2 days has been working but only testing it a few minutes at a time afraid to get stranded.

Clearly the Service guy saw that something needed to be replaced, so could it be a burned motor? Or the Sensor going bad?
Since you're unsure, start off with easy "possible" fixes. Have you tried changing the relay? If not, do it.
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Old 09-02-2015, 07:04 PM   #15
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Also what has the outside temp been like when this problem occurred? I know it's been super hot here in LA lately. It might be that your pump is overheating, and for that, there is a resistor mod you can DIY.

When you unlock your car, do you hear the pump coming on?
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Old 09-02-2015, 07:04 PM   #16
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Also what has the outside temp been like when this problem occurred? I know it's been super hot here in LA lately. It might be that your pump is overheating, and for that, there is a resistor mod you can DIY.

When you unlock your car, do you hear the pump coming on?
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Old 09-02-2015, 07:05 PM   #17
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Have not changed it. OK, I will start with that. This is definitely a noob question. What does the Relay deal with the SMG Pump?

Also what do you think of the Sensor Mod I have read on some threads?

Last edited by Senna-Man!; 09-02-2015 at 07:08 PM.
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Old 09-02-2015, 07:07 PM   #18
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I know that when it happens it must have been high 90's or early 100's The times when it happens the Buzzing sound stopped. I have been hearing it lately, but the fear is that it has stopped working at night on cooler temps, maybe 70's

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Old 09-02-2015, 07:12 PM   #19
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I have another question, Are you aware of anyone that knows how to do the mod? Any Mechanics that are doing this? I'm not mechanically inclined.
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Old 09-02-2015, 07:27 PM   #20
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http://www.ecstuning.com/BMW-E46-M3-S54_3.2L/ES31912/

That's the link to the Salmon Relay.

By sensor mod, do you mean the heat resistor mod for the hydraulic pump temp sensor?
It's easy to do. I'm in Glendale. I can drive out to you this weekend and do it for you. Just get the correct heat resistor.
What happens sometimes is, the temp sensor gets so hot during hot days, it sends a signal to the ECU stating that the hydraulic fluid is overheating, which is why you get thrown into N. So splicing a heat resistor into the wiring, can sometimes fix the problem if it in fact is caused by that and not the actual pump going out.

Try changing the relay first. That should always be the first thing to do when you experience SMG problems as it's the cheapest and easiest. The relay is located in the fuse box in your engine bay.
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