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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 01-21-2016, 08:44 PM   #1
tsegreto
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E46 M3 SMG Troubleshooting

Hello,

I have done a lot of reading on all the BMW forums, and my 2004 E46 SMG M3 has dreaded SMG problems.

The car won't go into gear sometimes, sometimes it will get stuck in a gear, recently it seems it has been going into neutral when it says it's in gear, and once it wouldn't even start.

My mechanic and I have checked the SMG fluid levels and replaced the salmon colored relays, no luck on either of those two fronts.

My mechanic (whom is a very good friend of mine) and I are at a loss on how to proceed. Using OBD II I get this error code over and over (this is the only error code I am getting):

P0750 Shift Solenoid A Malfunction

We have no idea how to proceed any further, could anyone help us troubleshoot this problem?

Thanks in advance,
Tony
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Old 01-22-2016, 10:31 AM   #2
srm200
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How many miles are on the car? Any previous SMG repairs? I am not as familiar will the generic codes, but I think that code is related to the slave cylinder. Without a factory tool or equal, it will be hard to troubleshoot this issue. The next thing you can do without any equipment is remove the slave cylinder(leave the hydraulic line connected because you will not be able to bleed it without a better tool) and inspect the clutch fork. I have seen the pivot pin for the clutch fork brake or the fork come loose due to a problem with the clutch/PP/TO bearings and cause intermittent issues until it breaks all the way.
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Old 01-22-2016, 03:54 PM   #3
tsegreto
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Quote:
Originally Posted by srm200 View Post
How many miles are on the car? Any previous SMG repairs? I am not as familiar will the generic codes, but I think that code is related to the slave cylinder. Without a factory tool or equal, it will be hard to troubleshoot this issue. The next thing you can do without any equipment is remove the slave cylinder(leave the hydraulic line connected because you will not be able to bleed it without a better tool) and inspect the clutch fork. I have seen the pivot pin for the clutch fork brake or the fork come loose due to a problem with the clutch/PP/TO bearings and cause intermittent issues until it breaks all the way.
Hi! Thanks for responding. I have 80,000 miles, don't really drive fast (too often ) or race it. No previous SMG work. Could you please elaborate on what you said and factory tools? I am not a mechanic, and don't know that much, I have read the SMG troubleshooting guides but I am at a loss for some things. And truthfully I don't understand a lot of what you said but I would like to explore what you're talking about.
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Old 01-22-2016, 06:44 PM   #4
srm200
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By "factory tools" I meant a dealership level scan tool or something close to it. Sorry about that. If you do not have access to something like this, you will likely spend a lot of time and get nowhere. SMG diag is not always easy, even with the factory tools. Trust me, I know.
My M3 had an SMG pump/valve body failure. Replaced the pump. 50 miles later clutch fork pivot pin broke. Took the transmission out and replaced that and the clutch kit since we were in there and it had 101k miles on it. I also replaced the slave cylinder because it didn't look so good. At this point I'm in $4k in parts and a lot of work. 300 miles later, the shift actuator(the last part in the system basically) went out. The car sits because it is another $2500 part and another time of taking out the transmission to replace it. I'm just going to convert my car to a standard 6 speed instead.
We have a car in the shop now that only has 77k on it and has an SMG failure. Mine started and snowballed at 101k. So you are there.

If your car needs a pump/valve body. I have one for you with only 350 miles on it. lol.
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Old 01-26-2016, 02:44 AM   #5
M3revspeed
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Op, how are you checking the SMG fluid?
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Old 01-27-2016, 01:33 AM   #6
iansevilla
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I had mine done by EuroAuto Spot in Miramar, San Diego Ca two weeks after purchasing the car. Car had 127k at the time. I have 145k now with no problems. Click image for larger version

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