C63 S205 intermittent hesitation/dead throttle
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C63 S205 intermittent hesitation/dead throttle
Hi, I am hoping someone can help me out before i lose the will to live.
I have just purchased a 2016 non S S205 with 54000K on it, the car is really clean and has full Merc history and if anything has been over serviced in it's life. The issue is that it has an intermittent issue with the engine power/throttle pedal just going dead, it seems to happen at low revs i.e. 1000-2000 rpm and can happens when it feels like it . the revs drop off and sink to around 750 rpm an the throttle pedal will become useless for anywhere between 1 second to 5 seconds (It's a joy coming out of junctions ) The ther day i did a 400 mile round trip and it didn't happen once, then i went out the other night 15 mile round trip and it did it twice. It happens in any mode . It has been in to my main dealer and they said it has no fault codes. I am at the point of handing the car back as the dealership i purchased it off are a little slow at reacting. I Have had a few of these and the old S204 and i know they can be quirky at times but i have never had anything like this. It almost feels like fuel or ignition but it had plugs less than 10K ago and i would expect the fault to be present all the time if this was the case . Mercedes said it could be pointing toward the clutch unit in the box but couldn't be sure. Any help would be great .
I have just purchased a 2016 non S S205 with 54000K on it, the car is really clean and has full Merc history and if anything has been over serviced in it's life. The issue is that it has an intermittent issue with the engine power/throttle pedal just going dead, it seems to happen at low revs i.e. 1000-2000 rpm and can happens when it feels like it . the revs drop off and sink to around 750 rpm an the throttle pedal will become useless for anywhere between 1 second to 5 seconds (It's a joy coming out of junctions ) The ther day i did a 400 mile round trip and it didn't happen once, then i went out the other night 15 mile round trip and it did it twice. It happens in any mode . It has been in to my main dealer and they said it has no fault codes. I am at the point of handing the car back as the dealership i purchased it off are a little slow at reacting. I Have had a few of these and the old S204 and i know they can be quirky at times but i have never had anything like this. It almost feels like fuel or ignition but it had plugs less than 10K ago and i would expect the fault to be present all the time if this was the case . Mercedes said it could be pointing toward the clutch unit in the box but couldn't be sure. Any help would be great .
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Loose connection in the system ?
If revolutions stay on 750/u-min and nothing
happens if you push pedal - i dont think there is a problem with transmission.
If Xentry noting tells - that tells us something.
can you uploade video to YT ?
i dont like to click unknown files !
If revolutions stay on 750/u-min and nothing
happens if you push pedal - i dont think there is a problem with transmission.
If Xentry noting tells - that tells us something.
can you uploade video to YT ?
i dont like to click unknown files !
Last edited by C63s_Jack; Mar 23, 2026 at 02:29 PM.
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I did think it could be something loose but where do you start on something like this. I do 20K a year so i need something i can just jump in go without the worry of it breaking down. I will whip the covers off the engine and have a quick check over everything to see if anything jumps out .
Thread Starter
Junior Member
Joined: Mar 2026
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Loose connection in the system ?
If revolutions stay on 750/u-min and nothing
happens if you push pedal - i dont think there is a problem with transmission.
If Xentry noting tells - that tells us something.
can you uploade video to YT ?
i dont like to click unknown files !
If revolutions stay on 750/u-min and nothing
happens if you push pedal - i dont think there is a problem with transmission.
If Xentry noting tells - that tells us something.
can you uploade video to YT ?
i dont like to click unknown files !
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Joined: Dec 2025
Posts: 436
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From: Keep it simple - keep it OEM
AMG C63s Coupe
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Senior Member
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From: Keep it simple - keep it OEM
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750 u/min is idle speed.
are you sure it stops there if problem is aktive or comes idle more down ? it looks like near 500 u/min.
Last edited by C63s_Jack; Mar 23, 2026 at 02:56 PM.
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Looking at it yes it seems to drop to near 500 , my mistake. It then just picks up and it can be fine again for the rest of the day . I’ve just been out now and it’s done it 4 or 5 times and the gearbox has gone proper clunky like someone’s kicking you in the back every gearbox change
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Same question here. What's going on with the car beeping at you? That's generally the safety systems. Did it think you were about to hit something? That could explain why it cut power. However, if you get clunking from the transmission, then I would agree that there might be something going on with the clutch or the rest of the transmission. The ECU and TCU are constantly talking to each other, so if the transmission is misbehaving, the ECU will not allow to put torque through which could make the issue worse. 54k isn't really any mileage for this transmission, although the old 7-speed has its issues. However, if this car was launched frequently by previous owners, then the startup clutch could be shot.
Just as an aside note, either way this car is not a 20k miles/year easy going commuter car even once you get this issue sorted. Especially given that it is now 10 years old. The consumables alone will set you back quite a bit. I get at most about 16k miles out of the brakes, so you are looking at a full brake job once a year, not to mention the tires you gonna go through. This thing loves to eat tires and brakes for breakfast.
Just as an aside note, either way this car is not a 20k miles/year easy going commuter car even once you get this issue sorted. Especially given that it is now 10 years old. The consumables alone will set you back quite a bit. I get at most about 16k miles out of the brakes, so you are looking at a full brake job once a year, not to mention the tires you gonna go through. This thing loves to eat tires and brakes for breakfast.
Last edited by superswiss; Mar 23, 2026 at 05:31 PM.
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From: Keep it simple - keep it OEM
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Same question here. What's going on with the car beeping at you? That's generally the safety systems. Did it think you were about to hit something? That could explain why it cut power.
However, if you get clunking from the transmission, then I would agree that there might be something going on with the clutch or the rest of the transmission..
However, if you get clunking from the transmission, then I would agree that there might be something going on with the clutch or the rest of the transmission..
i had one situation … combi is blinking - the radar !
i didnt know whats happend - why ?
piep i do not remember anymore.
On the same day i put the front star away ( DIY all black) and i saw a old leaf from a three on the sensor !
( inside)
clunking transission - the question is in situation of this idle fail or not ?
Last edited by C63s_Jack; Mar 23, 2026 at 06:06 PM.
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Same question here. What's going on with the car beeping at you? That's generally the safety systems. Did it think you were about to hit something? That could explain why it cut power. However, if you get clunking from the transmission, then I would agree that there might be something going on with the clutch or the rest of the transmission. The ECU and TCU are constantly talking to each other, so if the transmission is misbehaving, the ECU will not allow to put torque through which could make the issue worse. 54k isn't really any mileage for this transmission, although the old 7-speed has its issues. However, if this car was launched frequently by previous owners, then the startup clutch could be shot.
Just as an aside note, either way this car is not a 20k miles/year easy going commuter car even once you get this issue sorted. Especially given that it is now 10 years old. The consumables alone will set you back quite a bit. I get at most about 16k miles out of the brakes, so you are looking at a full brake job once a year, not to mention the tires you gonna go through. This thing loves to eat tires and brakes for breakfast.
Just as an aside note, either way this car is not a 20k miles/year easy going commuter car even once you get this issue sorted. Especially given that it is now 10 years old. The consumables alone will set you back quite a bit. I get at most about 16k miles out of the brakes, so you are looking at a full brake job once a year, not to mention the tires you gonna go through. This thing loves to eat tires and brakes for breakfast.
The beeping is the collision detection sensor as a car was slowing in front of me to turn in and that’s when this occurred . From what I can see from the last owners dash cam he left in it’s been driven for the last 4 years like Miss daisy 😂🫣 The dealership have offered to sort it but I fear it could be the case of multiple attempts 🤷♂️
im not worried about the cost to be honest . I’ve run two S204 C63’s back in the day doing 28k one year, and yes not as cheap as a Passat granted 😂😂. If you want to know expensive running try a Ferrari FF for 12 months 😂😂 makes these things look like running a Clio diesel !!
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thank you
Out Of Control!!
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From: San Francisco Bay Area
2019 C63CS
The beeping is the collision detection sensor as a car was slowing in front of me to turn in and that’s when this occurred . From what I can see from the last owners dash cam he left in it’s been driven for the last 4 years like Miss daisy 😂🫣 The dealership have offered to sort it but I fear it could be the case of multiple attempts 🤷♂️
im not worried about the cost to be honest . I’ve run two S204 C63’s back in the day doing 28k one year, and yes not as cheap as a Passat granted 😂😂. If you want to know expensive running try a Ferrari FF for 12 months 😂😂 makes these things look like running a Clio diesel !!
im not worried about the cost to be honest . I’ve run two S204 C63’s back in the day doing 28k one year, and yes not as cheap as a Passat granted 😂😂. If you want to know expensive running try a Ferrari FF for 12 months 😂😂 makes these things look like running a Clio diesel !!
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you need a very good mechanic !
the M177 ls1 is maximum of fuel efficient like a clio diesel - thats true.
Out Of Control!!
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2019 C63CS
N118 as far as I can see indicates a malfunction in the Fuel Pump Control Module. Could be an internal circuit board failure which can cause low voltage to the fuel pump or a wiring fault. This might be your best lead actually. Would make sense that your fuel pump is intermittently failing and not delivering enough fuel.
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N118 as far as I can see indicates a malfunction in the Fuel Pump Control Module. Could be an internal circuit board failure which can cause low voltage to the fuel pump or a wiring fault. This might be your best lead actually. Would make sense that your fuel pump is intermittently failing and not delivering enough fuel.
Thats what I thought , although since I posted this I managed to speak to the old owner of 4 years and he said it had done since he had it and just thought it was a quirk of them 🤷♂️. He said it did it really bad on Shell V Power , less on Tesco and it was a lot better on BP and Esso which blew my mind 😂. I’ve had the back seat out and checked the Fuel pump control unit and the pump connections and they all looked good , I was about to whip the pump out and in typical UK weather it started raining 😂. It’s going back in to Merc on Wednesday for Belts and more Diagnostics done I’m going to point them toward the fuel pump and coil packs .
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