Cant use the manual pedals and the power is wage down

 

Gonna need a bit more info then that .....

 

Scanned with ob2 turns out it throw fault code for p2743

 

That’s for trans temp too high so either the sensor is bad or you have a leaking heat exchanger causing high trans temps

 

Well that code is for transmission sensor (temp) and would definitely put your car in limp.

You need to get it check if its a faulty sensor or something going on in tranny.

but 1000% i wouldnt be driving it , more so hard

just my .02

 

What should the transmission temperature be at after a hard drive ? Current cruising temp was at 240

 

Why are you opening more threads for each question ??

Your Oil TEMP is WAY HIGH...

Limp mode is engineered for a reason, when the systems signal that something is happening that could cause damage to the engine/tranmission etc, it puts in limp so , you can get to a safe stopping point etc..
(not drive around and see if it goes away)

 

It's a stored code , after restarting it everything went back to normal. Just trying to figure out where the trans temp for this thing should sit at.

 

From what I have read and heard from people , normal and under hard driving, upto 200 f is what has been seen, even on hot days. (if your tracking it and behind other cars etc, and getting all that exhaust heat , it could go up.

The manual says @248 degrees (f) would be the limit.

 

If your car went into limp mode even once, you need to have the car looked at to see what caused it. If it was that the transmission oil temps were measuring too high (240 is way, way too high), you need to have the dealer investigate why that's happening.

Simply because the car reset itself out of limp mode after a restart doesn't fix what caused it to go into limp mode in the first place.

 

Im in Miami FL, its very hot and humid here. Make sure you are taking conditions into account.

Normal Driving Oil Temp ~ 200-204F
Normal Driving Trans Temp ~ 195-198F
Hard Driving Oil Temp ~210-218F
Hard Driving Trans Temp ~197-201F

But based on my Temps your are absolutely too high.

 

Also, it might be a good idea to have the transmission fluid replaced after being subjected to high temps.

 

2018 C63S here. I had a problem with high trans oil temps (went up to 259 deg), and never experienced the car going into limp mode and no fault codes Thankfully I always have the AMG display on so I can always see the boost and temps and caught it early. Turned out to be a leaking aux. charge cooler.

 

So I did have a fault code store in the system which I scanned before taking it to the dealer which was p2743


Here is what the service advisor is saying


"hi there, it appears as though the cooling system has been drained or opened up at one point. we will need to drain & refill the charge air cooling system In addition to bleeding it. it's not something i can cover under warranty & will be $225.00 + tax to do"


Is this a load of bs , because how can they tell if the system was opened or not .

 

You can easily tell if that cooling circuit is dry. Just look at the reservoir in the top/front of the engine near the turbos. There should be pink coolant visible in it. If not, you have a leak. And the leak more than likely is from a rock hitting the radiator. If so, it'll be another $1K-ish to replace the radiator.

 

Never had a low coolant warning or any leaks on the ground after driving the car.

 

There is no low coolant warning sensor on that cooling circuit. Your only warning is the trans temp reading on the AMG screen or an eventual CEL.

I had it happen to me, and the circuit was dry before the next time I stopped after the rock hit the radiator. But there should be coolant all over the undercarriage. Pretty hard to miss.

 

Yeah not a single drop on the undercarriage



we cannot find anything other than air possibly being in the system, there is evidence that the system has been opened up which is why we will have to start there



Lol dealers response, clearly a guess game even though the car had a fault code stored in it . This is ridiculous

 

Unless you are able to pull the undercarriage off and look at the top side of it, you won't be able to see it.

 

we cannot find anything other than air possibly being in the system, there is evidence that the system has been opened up which is why we will have to start there
Text STOP to opt-out.
--Mike Doehla Mercedes-Benz of Ontario


Fail dealership