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Old 01-31-2011, 12:28 PM
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Join Date: Dec 2010
Location: Baton Rouge, Louisiana
Posts: 14
What is the relationship between the kickdown switch and a code 25?


From previous posts and in another forum..for my 95' E420..

Is there any relationship between the kickdown switch and a Code 25...?
I have been having issues with an upshift from 1st. to 2nd from either a dead stop or kickdown at 30 - 40 mph.. So I disconnected the kickdown switch. Shifting improved somewhat but I still had the initial issue of the AT not shifting from 1st to 2nd revving up to cutoff at which point if I backed up on the pedal the AT will shift into 2nd then 3rd and 4th without problems..

Okay so I cleared the code 25, drove the car for two days, no CEL. Connected the kickdown switch and the next day CEL with #25..WTF..?
Does the kickdown switch play a vital electronic role, what is the correlation between this and my possible upshift problems..Its only a $30.00 part but I hate throwing money at something without knowing why.

BTW my AT does the Upshift delay when cold for the usual 1 mile then works OK as soon as the cat warms up..

Any help on or comments on the issue appreciated..

"The bitterness of poor quality remains, long after the sweetness of low price is gone..
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Old 02-02-2011, 09:15 PM
Join Date: Mar 2009
Location: Iceland
Posts: 423
This is caused by a sticking valve inside the transmission, I can access some more info at work.
600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
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