Transmission Flare
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Junior Member
Joined: Dec 2009
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From: STL
2009 S550V4 Saks Key to Cure
Transmission Flare
I've noticed a "flare" b/w 2nd and 3rd gears, only after the car has been parked for a few hours. It's more noticeable on a cold start but it happens in warmer temps as well. It occurs whether the car is in S or C mode. This has been going on for the past year when I bought the car but now that its getting colder, its getting more annoying. I've flashed the transmission a couple of times with no resolution. Any thoughts before I take it in? Thanks in advance.
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Joined: Jul 2007
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From: Boston
S-class
Our car all do that due to the electronic throttle control.if you want to eliminate that issue,I suggest you get the "Sprint Booster". My car does that too. On my clk,it also does that. So I got the sprint booster and the problem went away. You will feel a big difference with the booster installed. There's a vender doing a special promotion on the ecru upgrade/flash here so mabe you want to look into that instead because the sprint booster will set you back about $300-$400 compared to the ecru reflash. The ecu reflash claim to give you better gas milage and more power though?
Super Member
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
had similar problems on my previous S550. the dealer flashed ecu unit with upgraded programming and the problem went away.
MBWorld Fanatic!
Joined: Jul 2007
Posts: 1,460
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From: Boston
S-class
If you give the gas pedal a fast sudden stomp it will hesitate before the car takes off?
You can also try and reset the trans ecu.
1-hold down gas pedal all the way while engine is off
2-turn ignition to acc (2 clicks. But don't turn engine on)
3-keep holding gas pedal for 20 sec.
Now let go and start the car normally and give it a test run..
You can also try and reset the trans ecu.
1-hold down gas pedal all the way while engine is off
2-turn ignition to acc (2 clicks. But don't turn engine on)
3-keep holding gas pedal for 20 sec.
Now let go and start the car normally and give it a test run..
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Junior Member
Joined: Dec 2009
Posts: 30
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From: STL
2009 S550V4 Saks Key to Cure
Do the updated programs for the ECU have version numbers? In other words, how do I know if I already have the latest update? When I purchased the car last year, the supposedly did a flash update. In the meantime, I will try and reset the ECU myself. Thanks again for your help.
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Super Member
Joined: Jan 2008
Posts: 650
Likes: 24
From: Texas
2015 White/brown Nappa S550, '13 S550 4 matic, 11 S550 sold, '10 S550 Sports BLACK 08 S550 P3 sport
Do the updated programs for the ECU have version numbers? In other words, how do I know if I already have the latest update? When I purchased the car last year, the supposedly did a flash update. In the meantime, I will try and reset the ECU myself. Thanks again for your help.
