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Check voltage...(more) (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by LarryChew on August 03, 2001 at 00:11:08:

In Reply to: Need some help with auto trans problems posted by R Kieffer on August 02, 2001 at 19:19:17:

I have a 1992 525i and 2 years ago I experienced trans error code and the auto going into the "fail-safe limp home in 3rd gear mode".

Tough diagnosis - finally found it was a bad regulator putting out too many volts. The transmission electronics likes the correct voltage - and clean power. Switched the Valeo alternator/regulator unit for a Bosch unit for cleaner power (less "noise" than Valeo). No problems since.

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