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E46 General discussion and technical help for 1999-2004 3 series cars.

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Unread 05-08-2011, 02:17 PM   #1

Name: Belloz
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EGS Transmission warning

Hi everybody,
I got ride of my E46-2002 High-Line, with steptronic gearbox for 450Km at a speed of 160-190Km/h and after reaching the city I'm going to and cooled down my speed, the gear light warning is being let and the transmission is performing on emergency state, after stopping the car for 30min, the error has gone and the gear worked as expected.
When I drive my car again, I noticed that I have the same error each time my speed exceeds 140Km/h or when I kick-down.
So, I had to drive home with the warning lamp is on for the 300Km at a speed of 100Km/h, 2500rpm on gear 5 (manual mode)

By reading the EGS memory faults, I had the following errors:
21 EGS: Speed sensor, turbine
53 EGS: Control module, internal fault 4 (FET1)
54 EGS: Control module, internal fault 4 (FET2)
3C EGS: Transmission switch (plausibility) - sporadic fault
72 EGS: Steptronic switch - General fault

- What do you thing this can be related to?! taking in account that when I stop the car for 1 minute, the gear box performs as expected in normal mode.
Do you think it's something related to the gearbox oil or filter?!
Do you think it's safe to replace both the gearbox oil and filter?!
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Unread 05-11-2011, 09:11 AM   #2

Name: Manolito
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Join Date: May 2006
Location: Sacramento
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Your Ride: (2) '97 328s; '04 330; '04 325iT
That is a lot of faults. There must be some common fault that is confusing the computer. I have read two things about these transmissions that may be of help:
1) The most common failure after a few years is the thermistor. When it fails, it reports that the transmission is cold all the time, which confuses the computer. A shop-quality scanner will read the temperature directly from the computer, so you can see if it appears to be accurate.
2) The transmission computer is very sensitive to voltage variations, so it may start kicking out error codes as your battery or voltage regulator reach the end of their service lives.
3) Yours is the GM transmission, correct? I read that they can loose the pressure modulator that feeds reverse, but your problem does not sound like that.

The good news is that none of these common problems are serious or terribly expensive to correct.
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Unread 05-14-2011, 02:14 PM   #3

Name: belal
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I realized that those are not serious troubles specially that the transmission has no problems inside the city where I never go above 160Km/h for more than several minutes.
But, what is the failure that may confuse the TCU after over than one our driving on 180Km/h?

I suspect about the TSS (turbine speed sensor), that may send illegal information that fails helping the application regulation of the torque converter lock-up clutch!!!
My car is customized with 18" rim, and 180Km/h means 198Km/h actual speed which should be the maximum speed for the car torque, do you think the 18" rim is considered in this situation?
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