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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 05-05-2017, 02:29 AM   #1
hyungjs
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Join Date: Jan 2017
Location: LA
Posts: 6
My Ride: M3
SMG failure

I don't know if this happens a lot or not, on my 2003 M3, my smg acts really wired. Like, it works perfectly with no issue when my oil temperature is low, but whenever the oil temperature gets to 210F my transmission warning light will be on, and i cannot engage to any gear but Neutral. Neither my reverse gear. Then i will chill my car for like 1 hour, the oil temperature drops to around 160, the transmission warning light will be gone and the smg will work perfectly again until the oil temperature hits the 210F. Therefore I barely drive my car during the daytime, i only drive at night time it is a pain on my ass, the fault code says hydraulic failure, but its working totally fine at night

If u guys have any idea plz tell me, thanks a lot



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Old 05-06-2017, 08:20 PM   #2
Topazzar
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Join Date: Jun 2015
Location: Perth
Posts: 85
My Ride: '02 M3
Good luck mate, mine died 3 weeks ago, I have the hydraulic unit out at the moment and about to fit a new Burkhart motor I bought (comes with new, more viscous oil as well). The problem with the motor is the carbon brushes wear out. I guess the cheapest way to do it is just install new brushes into the DC motor if the rest of the unit is OK.

Check the Salmon relay and 40A is always the first thing people should do then get yourself a copy of INPA intalled on a laptop with WINDOWS XP (must be XP) and see what the issue is.

INPA - http://blog.obdii365.com/2017/01/18/...-vista-7-8-10/
Burkhart Motor - https://burkhart-engineering.com/54160en
Motor Installation -
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Old 05-07-2017, 01:25 AM   #3
hyungjs
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Bruh, im so scared thanks for the suggestions man


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Old 05-07-2017, 08:44 AM   #4
Topazzar
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Location: Perth
Posts: 85
My Ride: '02 M3
Well, just completed mine today. New motor on, SMG special tests done in INPA. System primes and all gears work. IT'S ALIVE!!
Mine was stuck in first and hydraulic pressure was zero a few weeks ago, it doesn't sound like yours is catastrophic like that ........ yet!
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Old 05-07-2017, 06:26 PM   #5
Hobohunter
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Join Date: Aug 2010
Location: Arlington, WA
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My Ride: 2001 M3
Quote:
Originally Posted by hyungjs View Post
I don't know if this happens a lot or not, on my 2003 M3, my smg acts really wired. Like, it works perfectly with no issue when my oil temperature is low, but whenever the oil temperature gets to 210F my transmission warning light will be on, and i cannot engage to any gear but Neutral. Neither my reverse gear. Then i will chill my car for like 1 hour, the oil temperature drops to around 160, the transmission warning light will be gone and the smg will work perfectly again until the oil temperature hits the 210F. Therefore I barely drive my car during the daytime, i only drive at night time it is a pain on my ass, the fault code says hydraulic failure, but its working totally fine at night

If u guys have any idea plz tell me, thanks a lot

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I never had issues with my old SMG, even in temps above 110F. I think there was a resistor mod you could wire in that would help in hot temps, but never having to deal with it myself, I can't be sure what it entailed.
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Old 05-08-2017, 03:17 PM   #6
doohver
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Join Date: May 2017
Location: San Jose
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My Ride: M3 E46 Convertible
It is a common issue, check out this forum thread -> http://forum.e46fanatics.com/showthread.php?t=686054_nr_
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Old 05-19-2017, 11:26 AM   #7
PhantomX
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Join Date: Sep 2004
Location: San Jose, N. California
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My Ride: E46 M3
Try the resistor mod and see if that works ( this is just a temporary fix though ) ---> http://forum.e46fanatics.com/showthread.php?t=855810
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Old 05-19-2017, 07:16 PM   #8
buddyz
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Join Date: May 2013
Location: Mass
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I have a similar issue-driving in 98 degree heat yesterday and the transmission warning light and service engine light came on, transmission dropped to zero and I couldn't drive it. No previous issues with the transmission. Waited a few minutes and it came back but happened about a dozen times trying to drive it my mechanic. He checked the codes but wasn't sure what the issue is. He called someone else who says "it probably needs a pump" but hasn't actually seen the car. "Take it to the dealer, we don't do SMG work". I let it sit overnight-today drives smooth as ever, no warning lights on dash. But I've called 2 shops and they both say "we cant do that SMG work, take it to the dealer". What's the chances its a real transmission failure vs a heat sensor or Salmon relay or just gremlins? Do I really have to take it to the dealer??
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