Sneaky transmission ecu reset for s550?
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Sneaky transmission ecu reset for s550?
Is there a different way to reset the transmission ecu on a s550? I heard it goes like this, Turn the igntion to the on position with key in the ignition, then hold gas pedal to the floor for 5 sec, then turn off the ignition while holding gas pedal then release. Is it the same way for the w221 s550? My tranny isn't shifting smothly especially when i'm in bumper to bumper traffic, it jerks real bad downshifting and also when i release the gas pedal and hit the pedal real quick again.
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From: WV
1993 300SD, 1997 S600 Coupe, 2007 S550 4Matic
Is there a different way to reset the transmission ecu on a s550? I heard it goes like this, Turn the igntion to the on position with key in the ignition, then hold gas pedal to the floor for 5 sec, then turn off the ignition while holding gas pedal then release. Is it the same way for the w221 s550? My tranny isn't shifting smothly especially when i'm in bumper to bumper traffic, it jerks real bad downshifting and also when i release the gas pedal and hit the pedal real quick again.
Out Of Control!!
Joined: Sep 2005
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From: West Michigan
2007 E63
Is there a different way to reset the transmission ecu on a s550? I heard it goes like this, Turn the igntion to the on position with key in the ignition, then hold gas pedal to the floor for 5 sec, then turn off the ignition while holding gas pedal then release. Is it the same way for the w221 s550? My tranny isn't shifting smothly especially when i'm in bumper to bumper traffic, it jerks real bad downshifting and also when i release the gas pedal and hit the pedal real quick again.
Almost a Member!
Joined: Nov 2003
Posts: 69
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From: WV
1993 300SD, 1997 S600 Coupe, 2007 S550 4Matic
Member
Joined: Jun 2005
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From: Bay Area, CA & Miami Beach
2005 SL500, 2015 GLK350 & S63, 2020 C63 & G63 and 2021 GLC63
Same thing has happened to my R500. Your transmission needs valve body replacement. The car will seem fine but the jerk MAY come back. If it does, it is a lemon. Make sure the service department writes "jerk in down shifting" when you drop your car at the dealership.
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Joined: Jan 2008
Posts: 650
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From: Texas
2015 White/brown Nappa S550, '13 S550 4 matic, 11 S550 sold, '10 S550 Sports BLACK 08 S550 P3 sport
Is there a different way to reset the transmission ecu on a s550? I heard it goes like this, Turn the igntion to the on position with key in the ignition, then hold gas pedal to the floor for 5 sec, then turn off the ignition while holding gas pedal then release. Is it the same way for the w221 s550? My tranny isn't shifting smothly especially when i'm in bumper to bumper traffic, it jerks real bad downshifting and also when i release the gas pedal and hit the pedal real quick again.
had similar problem with mine. the dealer updated the ecu software with a newer version, and i think they changed the trans oil while at it. drives like a dream. now. mine was at only 2000 miles.
good luck
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Joined: Jun 2005
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From: Bay Area, CA & Miami Beach
2005 SL500, 2015 GLK350 & S63, 2020 C63 & G63 and 2021 GLC63
Software upgrade at dealership is a waste of time. Please ask for valve body replacement. You need 4 similar complaints @ 2 different dealers to qualify for buyback. MB is pretty good about it.
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Joined: Jan 2007
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From: Toronto
V12TT
Is there a different way to reset the transmission ecu on a s550? I heard it goes like this, Turn the igntion to the on position with key in the ignition, then hold gas pedal to the floor for 5 sec, then turn off the ignition while holding gas pedal then release. Is it the same way for the w221 s550? My tranny isn't shifting smothly especially when i'm in bumper to bumper traffic, it jerks real bad downshifting and also when i release the gas pedal and hit the pedal real quick again.
Get your transmission ECU up to date
