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2008 M5, 155K, Transmission Red Cog (Seasonal Allergies?)

882 Views 17 Replies 5 Participants Last post by  sunilshivaram
I got the transmission red cog, and this message on the dash. Car was sitting all day and I started it and moved it around. Then the red cog showed up. The car was in D3, and it wouldn't "display" anything else. I could move it to "3" and back to "D3". A "+" or "-" on the transmission lever or the paddles wouldn't change a thing. I could move the car to Reverse and the car would go back, yet the display stayed in D3. When i moved it to Neutral, it still stayed in D3.
For moving forward, when i gave it some gas, the RPMs would go up and the car would move forward very slowly.
I brought the car back home, was just around the block, and parked it, and went running with our doggie for an hour.

I come back and start the car, everything normal.
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From ISTA, it shows faults that are stored, but not present. After i cleared all the faults, the SMG faults didn't show up.

I have to say this: I have seen this happen before, the red cog showing up, when the season changes and gets colder.
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4F81 is rare, I don't think I have seen it before. I don't think it is the clutch valve either. They may indicative of upcoming issue. I would run bleeding routine 3 times and wait and see.
Double click on each SMG fault and let see the details.
 

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bleeding exercise is when it finally gave out and puked its internals - bleeding sealed the deal for her to take the thousand dollar ride home
If bleeding blow up the slave then the slave is already blown and the car shouldn't be driven because you will damage the SMG and gearbox which may cause more to replace, there must be an early symptom, but yeah running SMG routine far away from home/shop may not be a good idea, my comment here was specific to OP based on his symptoms.
 

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It is better to show the details of the fault by double click on the fault and choose details.

It is normal to see random fault especially for clutch valve if adaptation was not performed after a major repair, beside extreme cold weather.

If stick this fault into the test plan it will guide you to run the clutch valve adaptation after wiring and resistance check to make sure the valve position is calibrated properly.
 
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