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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 10-14-2012, 09:01 PM   #21
///Mlifeforum
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I have had the same problem in hot and cold temps. Light comes on however vehicle runs just fine. Most of the time it just goes away after a drive cycle. I do notice that it only occurs in stop and go traffic. When I am running the interstates vehicle runs fine, even under hard acceleration.

Subscribed, hope you find the issue.
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Old 10-28-2012, 10:43 PM   #22
CJM3GUY
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Hey guys I was able to finally do the resistor mod which took about 30 minutes total and voila the car hasn't dropped out of gear since. I drove it in 90+ degree weather in traffic which it would normally cause the cog light come on and it didn't . It's like a dream come true to not have to fear that dreaded light anymore I would recommend this mod to anyone having similar issues.
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Old 10-28-2012, 11:30 PM   #23
illestminimike
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Sick! Glad we can help.
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Old 10-28-2012, 11:54 PM   #24
Nyght
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This mod is a must for SMG M3 owners. Works like a charm.
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2005 M3 Jet Black SMGII
Exterior:ZCP/CSL Wheels Carbon Fiber CSL Trunk. Remus Exhaust. Black Exhaust Tips. Matte Black Kidney Grills and Gills. Engine:AFE Intake, TurnerMotorSport Lightweight Pulley Power Kit, Supersprint Headers (Catless) 1 AR20 and 1 magnaflow resonator on stock mid pipe. Supersprint X-pipe Activeautowerke Tune.
S85 Swap in progress est: Late 2013 :)
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Old 10-30-2012, 05:04 AM   #25
roadtrip1098
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For future reference. http://forum.e46fanatics.com/showthread.php?t=928274
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Old 11-01-2012, 01:35 AM   #26
CJM3GUY
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Hey guys,

so Captain jinx came back to kick my ass....today I was driving for about 30-40 mins in heavy stop and go traffic and despite the resistor mod the cog light came back again and just dropped me down into neutral at a red light in the middle of traffic (major embarrassment) I also noticed when the car was dead and I turned the key to position one the red section of the coolant temp gauge would light up but as I was driving it never went past the halfway marker at all and as the car was going into neutral at the light the battery icon was flashing. I will try getting the codes read in the next couple days but maybe its possible the battery is failing? thus causing the cooling system to malfunction or maybe I need a new hydraulic or water pump? any suggestions would be great! damn this things has a mind of its own but I still love it to death just gotta find the cause.... thanks guys !
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Old 11-01-2012, 01:37 AM   #27
CJM3GUY
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Also, when I previously got the codes read they said I may have a faulty constant pressure valve that I never got around to fixing yet, could that possibly be feeding into this problem at all?
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Old 11-01-2012, 09:59 AM   #28
Nyght
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I would start with the battery and get it tested and or charged. CPV valve is an easy fix but that shouldn't make you drop out of gears.From what your telling me, i think its electrical. I could be wrong. Just my 2 cents.
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2005 M3 Jet Black SMGII
Exterior:ZCP/CSL Wheels Carbon Fiber CSL Trunk. Remus Exhaust. Black Exhaust Tips. Matte Black Kidney Grills and Gills. Engine:AFE Intake, TurnerMotorSport Lightweight Pulley Power Kit, Supersprint Headers (Catless) 1 AR20 and 1 magnaflow resonator on stock mid pipe. Supersprint X-pipe Activeautowerke Tune.
S85 Swap in progress est: Late 2013 :)
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Old 11-01-2012, 10:11 AM   #29
roadtrip1098
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What's the mileage? If you're in the 100k neighborhood and still on the stock water pump, it wouldn't be a bad thing to consider replacing.
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Old 11-01-2012, 10:19 AM   #30
CJM3GUY
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I currently have 80K miles on the car and yes I think it may be the battery because I also noticed last night that sometimes while im driving the lights in the instrument cluster will kind of flicker a bit and yes I am looking into replacing the water pump as we speak
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Old 12-10-2012, 11:29 AM   #31
CJM3GUY
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Hey guys sorry its been awhile so I finally got my problem fixed. I had taken it in to BMW again and they were trying to charge me 4300 to install a new hydraulic unit but I had a feeling my hydraulic pump wasnt broken since the problem only happened every now and then so I took it to my mechanic and he discovered that the hose connected to my hydraulic pump was leaking a bit so he bled the system and replaced the hose and voila I drove in traffic for 2 hours this weekend no cog light showed up and the car runs great now feels good to not have to worry about that light showing up anymore! Hopefully some people out there can use this to solve their problem
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Old 12-10-2012, 11:32 AM   #32
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Great to hear it all worked out.
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