2008 W204 Transmission Jerkiness
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Joined: Jul 2012
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2008 Mercedes-Benz C300 Sport
2008 W204 Transmission Jerkiness
I have the 2008 C300 4Matic Sport and I have been noticing transmission jerkiness while easing off the accelerator and in congested traffic and such. I have read that there are issues with the 722.9 transmission, but how do I tell if that is what my car has?
What are the steps to get it fixed and can it be done for free? According to what I have read the TCU just needs a software update.
Thanks.
What are the steps to get it fixed and can it be done for free? According to what I have read the TCU just needs a software update.
Thanks.
Super Member
Joined: Mar 2012
Posts: 591
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From: San Francisco
'08 Mercedes C300
It sounds like engine braking, which helps you slow down by downshifting. You can reset your TCU because it learns your driving style.
-Turn your car to the ON position
-Press the gas pedal all the way down and hold for 5 seconds
-Turn your car off while your foot is still on the gas, but leave the key in
-Take your foot off the gas pedal and wait 2 minutes before turning on your car or removing the key
You'll need to do this every few days because the TCU will learn your driving style.
-Turn your car to the ON position
-Press the gas pedal all the way down and hold for 5 seconds
-Turn your car off while your foot is still on the gas, but leave the key in
-Take your foot off the gas pedal and wait 2 minutes before turning on your car or removing the key
You'll need to do this every few days because the TCU will learn your driving style.
Thread Starter
Newbie
Joined: Jul 2012
Posts: 8
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2008 Mercedes-Benz C300 Sport
I actually did stumble across this. I tried it already, but I wasn't going anywhere so I had my door opened and this probably stopped it from working. It was saying to take keys out or turn lights off once I turned my car off and took my foot off the gas.
From what I heard, I probably need to shut the door and turn everything off like radio, air, lights, etc. and then do those steps and sit in the car quietly for 2 minutes without opening the door.
I'll try it out tomorrow before work and if that doesn't work I'm thinking about getting my TCU software updated.
From what I heard, I probably need to shut the door and turn everything off like radio, air, lights, etc. and then do those steps and sit in the car quietly for 2 minutes without opening the door.
I'll try it out tomorrow before work and if that doesn't work I'm thinking about getting my TCU software updated.
It sounds like engine braking, which helps you slow down by downshifting. You can reset your TCU because it learns your driving style.
-Turn your car to the ON position
-Press the gas pedal all the way down and hold for 5 seconds
-Turn your car off while your foot is still on the gas, but leave the key in
-Take your foot off the gas pedal and wait 2 minutes before turning on your car or removing the key
You'll need to do this every few days because the TCU will learn your driving style.
-Turn your car to the ON position
-Press the gas pedal all the way down and hold for 5 seconds
-Turn your car off while your foot is still on the gas, but leave the key in
-Take your foot off the gas pedal and wait 2 minutes before turning on your car or removing the key
You'll need to do this every few days because the TCU will learn your driving style.
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Joined: Jan 2010
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I have noticed this also but mostly when slowing down to a T junction at the top of a hill. Mine is probably the down shift by the sounds of it, which makes sense.
Has anyone tried this method to reset the TCU on a UK vehicle?
Has anyone tried this method to reset the TCU on a UK vehicle?
