C63S Loss of Power?
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 72
Likes: 4
2016 C63S Sedan
C63S Loss of Power?
Hi guys, I am completely stumped. I have a 2016 C63S Sedan that I bought pre-owned last year and has been great (at least so I've thought). I recently got it tuned and could not tell the difference in power and had got 2 check engine light codes P0108 and P2A0D. Tuner told me it is probably my spark plugs as car has about 33k miles on it now, so I changed plugs and reflashed and CEL's went away and thought all was good. Took car to get dyno'd today and under stock file car put down 405hp to rear wheels and with tune 430hp.. These numbers seem way to low and I am thinking I have a boost leak somewhere? Car feels very laggy at low RPM but I never thought of anything to it as I thought thats just how it is. Shop that dyno'd showed me other stock C63s graphs and I am missing about 100hp on every RPM level and does not rise up like them. Anyone else experience anything like this or have any thoughts on what I should do?
Junior Member
Joined: May 2016
Posts: 31
Likes: 3
From: Florida
2016 C63s
I have a 2016 also and have had doubts all summer about the power delivery. The air temperature has been a lot hotter this year then the last two, so I figured the car was just reacting to the excess heat. The auxiliary fan runs for at least a minute after every shutdown. I got a check engine light 2 days before my 30,000 mile service. Turns out that I had a faulty charcoal canister and a leak in the purge system. They replaced it, ran an evaporative emissions check and the car is back to the day I bought it. I can tell I have full power delivery back and every start performs a cold start now. Maybe I got a software update with the 30,000 mile check that wasn't mentioned. All I know is it is very different and much better. Might be worth a check. Could be that simple. I don't know if it was related to that or not but I figured I'd share the story because I recieved a great improvement as a result.
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 72
Likes: 4
2016 C63S Sedan
I have a 2016 also and have had doubts all summer about the power delivery. The air temperature has been a lot hotter this year then the last two, so I figured the car was just reacting to the excess heat. The auxiliary fan runs for at least a minute after every shutdown. I got a check engine light 2 days before my 30,000 mile service. Turns out that I had a faulty charcoal canister and a leak in the purge system. They replaced it, ran an evaporative emissions check and the car is back to the day I bought it. I can tell I have full power delivery back and every start performs a cold start now. Maybe I got a software update with the 30,000 mile check that wasn't mentioned. All I know is it is very different and much better. Might be worth a check. Could be that simple. I don't know if it was related to that or not but I figured I'd share the story because I recieved a great improvement as a result.
Junior Member
Joined: May 2016
Posts: 31
Likes: 3
From: Florida
2016 C63s
My auxiliary fan also runs for a minute or two after shutdowns after being driven for a bit of time... however no check engine lights or anything. I took my car to dealer today and explained to them that I feel a loss of power and they scanned for any possible codes regarding boost leaks or anything and could not find anything wrong with vehicle and said they have nothing to chase after for warranty work because car is not flagging anything. I have it flashed to stock at the moment, it is quite frustrating that I am driving around a "skimped" C63S, debating on trading car in for something else. No clue what to do at this point...
Damn, it sounds frustrating. Maybe you going back to stock will trigger a check engine light in a few days if those errors are still there and then you will have something for them to actually look for. I don't know what your relationship is like with your service advisor but I wouldn't hesitate to have a conversation with them about the error codes you had and what you did to fix them. Ask to talk to a tech also and run your concerns by them. Maybe they will have some insight. I had a hydraulic issue with my E90 M3 and no warnings were triggered. I kept having conversations with my service guy and the tech and it was resolved through trouble shooting the symptoms.
Good luck and I hope you figure it out soon.
Last edited by ChaseRMc; Aug 6, 2019 at 10:04 PM. Reason: Grammar
Senior Member
Joined: Jan 2019
Posts: 439
Likes: 74
From: California
2019 AMG C63S
From what I've researched, the fans running after turning off the car is quite normal. My radiator fan runs at least for three to five minutes after turning off the car whenever I drive in Sport+. This is especially true when it's hot outside and/or if you park your car in your garage, since the garage is usually much hotter than just open parking.
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