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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 10-04-2012, 11:42 AM   #1
CJM3GUY
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Question Yellow Cog light showing up but car runs without problem

Hey guys,
I have a 2003 M3 vert with 78,xxx miles. So I went through the whole SMG fiasco where my car stopped in gear shifts and went to neutral (limp mode) and had to wait a couple hours before driving it again in +100F weather. So I replaced the salmon relay and I've driven it in +100F weather several times now without it ever doing that again, however, I have noticed that sometimes when I am driving in stop-and-go traffic for a long time I notice my yellow cog wheel light comes up. Sometimes it just flashes and if my car is stopped it will go away and sometimes it will just pop up and I can keep driving without any problems (most of the time I try to pull over and turn my car off for a few mins and when I turn it back on the light is gone). I am just wondering if any of you have this same problem or know the exact cause and if I should be worried.
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Old 10-04-2012, 11:47 AM   #2
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bump-n-sub for curiosity
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I am content with cruising at only 130 mph.
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Old 10-04-2012, 03:20 PM   #3
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You really haven't searched. There's a fix to this. Check the M3 forum. It's called "Fix Your SMG".
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Old 10-04-2012, 05:08 PM   #4
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^ wut he said.

its still something i need to do.
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Old 10-04-2012, 06:08 PM   #5
CJM3GUY
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Thanks guys! ... Although my problem isnt exactly the same as I have not dropped out of gear I am just wondering why might light comes on if I continue driving and theres no problems with the gear shifts at all.
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Old 10-04-2012, 06:16 PM   #6
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Thanks guys! ... Although my problem isnt exactly the same as I have not dropped out of gear I am just wondering why might light comes on if I continue driving and theres no problems with the gear shifts at all.

happens to me, its the temp sensor for the SMG thinking its over heating. When in reality, it isnt at all.
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Old 10-04-2012, 09:06 PM   #7
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Ahhh i see, thank you do you know if replacing the sensor is difficult ??
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Old 10-04-2012, 09:51 PM   #8
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Go search the DIY. It's a process, kind of.
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Old 10-05-2012, 12:25 PM   #9
CJM3GUY
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Ahh okay thanks for the input!
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Old 10-05-2012, 03:25 PM   #10
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Pull the code.
Replace the relay.
Clear the code.
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Old 10-05-2012, 04:17 PM   #11
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Pull the code.
Replace the relay.
Clear the code.
Read thread.
Make Post Relevant.
????????????
Profit.
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Old 10-05-2012, 05:03 PM   #12
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Originally Posted by rcsummers View Post
Read thread.
Make Post Relevant.
????????????
Profit.
I'm pretty sure if he pulled the code it would give him a better idea of what's wrong.
Relays have been known to go bad, even a after replacing them.
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Old 10-05-2012, 05:36 PM   #13
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I'm pretty sure if he pulled the code it would give him a better idea of what's wrong.
Relays have been known to go bad, even a after replacing them.

SMG M3's get the heat blues, but doing exactly what he said. You add a resistor to the temp sensor for the SMG and VUALA it fixes it self.
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Old 10-05-2012, 06:01 PM   #14
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Originally Posted by DustinMikk View Post
Pull the code.
Replace the relay.
Clear the code.
Don't post wrong information please. What rcsummers is saying is true. OP, just needs to find the thread himself.
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Old 10-05-2012, 07:36 PM   #15
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oh Okay thank guys I have the resistors and butt connectors so I have a weekend project now
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Old 10-05-2012, 07:38 PM   #16
CJM3GUY
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and btw RC and Illest you guys have some dopeass rides keep doin what your doin!
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Old 10-05-2012, 08:52 PM   #17
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Thank you! Let us know how everything goes.
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Old 10-07-2012, 09:44 PM   #18
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I've had the SMG pump replaced twice now. (both under warranty) Initially when the cog light came on the car seemed fine I assumed it was just a random code and booked in to see the dealer, unfortunately as time went by engaging gears in the morning was less and less reliable.

After reading a lot here, and wondering at likelihood of the second pump failure in under a year I enquired if it could be the relay, I was told that while the relay was failing, the cause was the pump drawing too much current, in turn causing the relay to burn out, so a new relay would just mask the issue.

I can't say I trust information the dealers repair centre give me... but this did sound plausible. (but I'm not a mechanic.)

I'd say it's certainly worth pulling your new relay and taking a look at it, along with getting the codes read, and perhaps implementing the heat fix.
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Old 10-08-2012, 12:44 PM   #19
CJM3GUY
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Thank you! Let us know how everything goes.
I didnt get a chance to do it this weekend guys but i will let u know as soon as i have
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Old 10-08-2012, 12:46 PM   #20
CJM3GUY
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Quote:
Originally Posted by Mallee View Post
I've had the SMG pump replaced twice now. (both under warranty) Initially when the cog light came on the car seemed fine I assumed it was just a random code and booked in to see the dealer, unfortunately as time went by engaging gears in the morning was less and less reliable.

After reading a lot here, and wondering at likelihood of the second pump failure in under a year I enquired if it could be the relay, I was told that while the relay was failing, the cause was the pump drawing too much current, in turn causing the relay to burn out, so a new relay would just mask the issue.

I can't say I trust information the dealers repair centre give me... but this did sound plausible. (but I'm not a mechanic.)

I'd say it's certainly worth pulling your new relay and taking a look at it, along with getting the codes read, and perhaps implementing the heat fix.
Yea they told me it was the pump and I had just bought the car from a reputable dealer and it is under warranty, the dealer said other dealers will sometimes tell you that in order to charge more however it would solve the problem but a pump may not be needed. The car seems to shift fine even in the morning and since the relay was replaced I dont seem to have any gear-shift issues im going to try the resistor mod and hopefully that eliminates the cog light from coming up aka the temp sensor. I guess if it still comes up it would be a faulty pump under which case id take it and get it replaced under warranty. Some other forum users have said that theyve got their pump and relays replaced and the light still comes up in that case it would be the faulty temp sensor, thats why Id rather try everything else first before replacing the pump... thanks for the info

Last edited by CJM3GUY; 10-08-2012 at 12:49 PM.
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