C63/C63S P0128 CEL Code
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Joined: Aug 2019
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C63 AMG
C63/C63S P0128 CEL Code
Hi Everyone,
I currently have a DME Stage 1 tune on my car. I was driving my car today and out of the blue my check engine light went on. Luckily my friend a mile away has an OBD II scanner and we ran it. Turns out it was a P0128 Code which is the thermostat and coolant. Is there a way to reset this? The car runs completely fine. I don't want to have to re-flash it back to stock and take it to the dealer because I don't have a MyGenius and I would have to drive to my tuner then the dealer after.
I currently have a DME Stage 1 tune on my car. I was driving my car today and out of the blue my check engine light went on. Luckily my friend a mile away has an OBD II scanner and we ran it. Turns out it was a P0128 Code which is the thermostat and coolant. Is there a way to reset this? The car runs completely fine. I don't want to have to re-flash it back to stock and take it to the dealer because I don't have a MyGenius and I would have to drive to my tuner then the dealer after.
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⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Hi Everyone,
I currently have a DME Stage 1 tune on my car. I was driving my car today and out of the blue my check engine light went on. Luckily my friend a mile away has an OBD II scanner and we ran it. Turns out it was a P0128 Code which is the thermostat and coolant. Is there a way to reset this? The car runs completely fine. I don't want to have to re-flash it back to stock and take it to the dealer because I don't have a MyGenius and I would have to drive to my tuner then the dealer after.
I currently have a DME Stage 1 tune on my car. I was driving my car today and out of the blue my check engine light went on. Luckily my friend a mile away has an OBD II scanner and we ran it. Turns out it was a P0128 Code which is the thermostat and coolant. Is there a way to reset this? The car runs completely fine. I don't want to have to re-flash it back to stock and take it to the dealer because I don't have a MyGenius and I would have to drive to my tuner then the dealer after.
I clear it and it doesn't come on again or cause any issues that I know of.
What did you end up doing about yours?
UPDATE: Spoke to tuner who confirmed this is purposely set on tunes to keep the car cooler. So if your tuned, ignore it.
Last edited by Jimmy_c63s; Dec 7, 2020 at 11:15 AM. Reason: Added photo
Junior Member
Joined: Aug 2020
Posts: 48
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From: SLC, Utah
C63
Just got this code as well. Dealer says they need to replace the thermostat under warranty. Taking the car in on Thursday for the repair, I will keep you posted if this resolves the CEL.
After a bit of reading I found that this code can also be present during colder months if the engine temp does not come up within a certain timeframe. For example, I live up in the mountains in Utah and to get to work it's a 15 min drive down the hill where I essentially coast before the car even has a chance to warm up. One day last week was colder than normal and that's when I got my CEL.
After a bit of reading I found that this code can also be present during colder months if the engine temp does not come up within a certain timeframe. For example, I live up in the mountains in Utah and to get to work it's a 15 min drive down the hill where I essentially coast before the car even has a chance to warm up. One day last week was colder than normal and that's when I got my CEL.
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,723
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From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Just got this code as well. Dealer says they need to replace the thermostat under warranty. Taking the car in on Thursday for the repair, I will keep you posted if this resolves the CEL.
After a bit of reading I found that this code can also be present during colder months if the engine temp does not come up within a certain timeframe. For example, I live up in the mountains in Utah and to get to work it's a 15 min drive down the hill where I essentially coast before the car even has a chance to warm up. One day last week was colder than normal and that's when I got my CEL.
After a bit of reading I found that this code can also be present during colder months if the engine temp does not come up within a certain timeframe. For example, I live up in the mountains in Utah and to get to work it's a 15 min drive down the hill where I essentially coast before the car even has a chance to warm up. One day last week was colder than normal and that's when I got my CEL.
If yours is tuned, you can safely rule it out as a function of your tune.
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Joined: Aug 2020
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From: SLC, Utah
C63
My car is not yet tuned, but this is good to know!
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From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
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From: Florida
AMG C63s
This sounds fishy to make a general statement that tunes cars would throw such CEL. There are many tuned cars here and nobody has seen or reported that ...and my tuner would sure disagree a CEL is normal after tune,
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2021 AMG C63 Coupe
Sorry to hear that, this site has been such a lesson on modes and ownership.
Most I would ever change on this car would be cosmetic lol
Unless you track it , all the performance mods you do serve no justice. That is just me thou , I cringe at reading some of this stuff.
If you want raw power step up to the 911 , Mclaren , etc or jump into a V10
If you are smart enough to finance or lease a 80K+ Coupe / Sedan then surely you can jump into a Porsche
Again , that's just me. I hate seeing all these stories of error codes and engines blown , oil leaking , etc
This cars appears to be raw from the Jump.
Most I would ever change on this car would be cosmetic lol
Unless you track it , all the performance mods you do serve no justice. That is just me thou , I cringe at reading some of this stuff.
If you want raw power step up to the 911 , Mclaren , etc or jump into a V10
If you are smart enough to finance or lease a 80K+ Coupe / Sedan then surely you can jump into a Porsche
Again , that's just me. I hate seeing all these stories of error codes and engines blown , oil leaking , etc
This cars appears to be raw from the Jump.
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MBWorld Fanatic!
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From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Doubt anyone else would even bother taking the time to respond or report anyway. Pretty dead in here these days.
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From: Florida
AMG C63s
Others wouldn't even know because the error code doesn't come up as a CEL if it's adjusted by the tuner. For me, I'm not throwing a CEL on the dash at all but the code will appear if I scan it. And I'm just reporting back on what my tuner has told me today when I contacted him in case others search for this code.
Doubt anyone else would even bother taking the time to respond or report anyway. Pretty dead in here these days.
Doubt anyone else would even bother taking the time to respond or report anyway. Pretty dead in here these days.
