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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 12-10-2016, 08:39 PM   #1
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Join Date: Dec 2016
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My Ride: m3
Strange Squeal? SMG?

Before I start tearing my car apart, I want knowledgeable individuals to weigh in. So short back story of the issue. This is my wife's daily. 02 M3 SMG. Approx 146k miles. She called me one day, said the car had a strange smell and started to die or shudder, something. And the SMG cog light came on. She pulled over and shut it off. I went to go get the car and it wouldn't start. A couple days of headaches later, I cleared all codes, and the error 59 stayed. I unplugged the GPS, and the car started, but it has a high pitched squeal. Think of a slipping belt next to a megaphone. I took the car to a local shop and they said SMG pump needed to be replaced. It's a reputable shop, but I have heard of shops misdiagnosing pumps before since it's the go to. My only concern before I go through changing it is the loud squeal and burning smell. I cannot find anything from anyone else who has this issue. The shop said it was the pump "going crazy".

Additional info: the pump primes on unlocking the door, I changed the salmon relay, the 40 amp fuse is fine.

I just want other opinions. I have already accepted replacing the pump, but I would like to hear other opinions or confirmations before I go through the trouble.
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Old 12-12-2016, 07:46 AM   #2
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Location: Western Australia
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My Ride: M3 - SMG
Ok so is the squeal coming from the SMG hydraulic pump?
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Old 12-12-2016, 11:15 AM   #3
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Error 59? 59 what? Unplugged the GPS? The BMW GPS? Your personal GPS?

Too many random statements in your post.

If the pump is activating it is NOT the "salmon relay". You wasted $15 there. Gets your codes read with INPA or Rheingold.
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Old 12-12-2016, 11:33 AM   #4
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My Ride: 2002 M3
GPS = gear position sensor

CODE 59 clutch actuator dynamic

Wonder if something has gone bad with your clutch and or its actuation? Could explain the smell?

Google found this:

M3 has 58k miles.

Complaint: M3 started making loud grinding noise..stalled while driving...engine has no crank/no start. SMG light is lit up. FC 59 or 3B for actuation, clutch, dynamic.

Cause: Plastic ball pin at one end of clutch fork broke causing the piston to push further on the fork thus hitting the pressure plate. Spinning pressure plate grinded some metal off of the clutch fork making it thin enough for the piston to punch a hole through it. Clutch is now inop.

Correction: Removed transmission and replace ball pin, spring clip, clutch fork, and new clutch assembly.

I have done over 100 launch control functions and numerous HPDE events and the clutch still looks good. Not going to take any chances and just replace the pressure plate and disc.

Last edited by crazyazz; 12-12-2016 at 11:35 AM.
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Old 12-19-2016, 08:00 PM   #5
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My Ride: 2005 E46 M3
Good find! It's always the small stuff that breaks and causes catastrophic failures. LOL
2005 Silvergrau E46 M3 SMG
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smg, smg pump, transmission

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