Throttle lag issue solved!
Thread Starter
Senior Member
Joined: Jul 2017
Posts: 337
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From: Seattle
2016 C300 4MATIC
Throttle lag issue solved!
I had my car in yesterday for a B maintenance and a few other things. One thing I had them check was the transmission, as it seemed as if it was shifting hard. There were no fault codes found for shifts outside the normal parameters. However, he said there was a new software update for the transmission, so they updated it.
It's like a different car! And, I'm not referring to resetting the TPU different. It's amazing! Most impressive is that the initial throttle lag is completely gone. It's 100% responsive as soon as you touch the throttle.
To be fair, the throttle lag is "planned" in the name of comfort. Keeps your passengers from hitting their heads on the headrest when you accelerate.
That said, it's like I've added a tuned ECU- the car is totally different. I would recommend taking your cars to the dealership for this software update.
I'm under warranty, so there was no charge. I don't know what it would cost out-of-pocket, but it only took minutes.
It's like a different car! And, I'm not referring to resetting the TPU different. It's amazing! Most impressive is that the initial throttle lag is completely gone. It's 100% responsive as soon as you touch the throttle.
To be fair, the throttle lag is "planned" in the name of comfort. Keeps your passengers from hitting their heads on the headrest when you accelerate.
That said, it's like I've added a tuned ECU- the car is totally different. I would recommend taking your cars to the dealership for this software update.
I'm under warranty, so there was no charge. I don't know what it would cost out-of-pocket, but it only took minutes.
Junior Member
Joined: Aug 2016
Posts: 38
Likes: 3
2014 C300 4MATIC
I have done this update on my 2014 C300 as well at a dealership about half a year ago, and it does feel great.
Did not cost me anything since I was under the warranty.
When the transmission software was updated, there was also another change.
Now in manual mode, the speedometer lets me know to upshift to a next gear with an arrow sign.
Thought it was cool, but not really necessary in my opinion.
Did not cost me anything since I was under the warranty.
When the transmission software was updated, there was also another change.
Now in manual mode, the speedometer lets me know to upshift to a next gear with an arrow sign.
Thought it was cool, but not really necessary in my opinion.
Junior Member
Joined: Aug 2016
Posts: 38
Likes: 3
2014 C300 4MATIC
The arrow comes up next to the gear symbol.
(Let's say you're on S1 or E1, it shows/tells me 2↑ to shift up to a next gear in green color, if I remember correctly)
It seems accurate, but I never shift that early that it tells me to for spirited driving.
(Let's say you're on S1 or E1, it shows/tells me 2↑ to shift up to a next gear in green color, if I remember correctly)
It seems accurate, but I never shift that early that it tells me to for spirited driving.
Junior Member
Joined: Oct 2016
Posts: 59
Likes: 5
From: Central PA
1986 Porsche 911 Coupe, a 2002 CLK320 & 2013 C300
It's what the c63 has, I was reading my manual, familiarizing myself with my new to me 2013 C300 and the pictures showing the AMG model show the up-shift arrow you describe, so the "function" has been around a while. The transmission lag is certainly there, but I guess I've grown used to it having driven a W208 for a while now.
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