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Old 04-26-2017, 09:09 AM
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Location: Danmark
Car: BMW 630i
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Default SMG, new tyres

I have a BMW 630i convertible with the SMG transmission, and after changing to summer tyres and resetting the RPA, I was humming along leisurely at 150 kph. A Mercedes wanted to pass, so I floored my BMW to get out of the way and into a hole in the traffic a little further ahead.

When I floored my 6-speed SMG at 150 kph, it shifted down to fourth gear as it should, but the clutch slipped for maybe 10 seconds before it engaged, and threw fault codes 4EF8, 51A7 and 50DE, which all mean the same, namely that the clutch is slipping. It also gave the "safe mode" cogwheel message, but that went away of its own accord after a little while, probably because I just kept going in sixth gear.

There is nothing wrong with my SMG, it works as it should, the computer was simply experimenting with the clutch in order to calibrate and adjust to the new tyres. What I should have done, was to follow the procedure from the M5 manual, which for some reason is not documented in the E63/E64 manual.

This is the procedure:

1. Move the selector lever into the idling
position N on a straight stretch of road at a
speed between 20mph/30km/h and
90mph/150km/h.

2. Pull both shift paddles for approx. 2 sec-
onds.

If you don't do this after changing tyres, the car will experiment of its own accord, until it thinks it has gotten it right.


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