2020 GLC 63 CEL For engine not coming up to temp
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Joined: Dec 2023
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2020, 2018 GLC 63
2020 GLC 63 CEL For engine not coming up to temp
So I Have a 2020 GLC 63 that is Euro tuned stage 2 tuned with catless downpipes. It has been at the dealership since forever 6 months. They have replaced the thermostat 3 times by three different dealerships, 3 water pumps and both fuel pumps and a list of other parts. The latest they are wanting to replace the ECU the TCU and CPC at a cost of 12,000.00 in part alone not counting labor. They have flashed over the tune back to the factory. They say that the tune has corrupted all three units, which I find hard to believe. Does anyone have any ideas on what I should look at before throwing that kind of money at it?
Thanks
Thanks
Newbie
Joined: Dec 2023
Posts: 2
Likes: 0
2020 GLC63
I would like to know as well. Just tuned EC stage 1 and CPC, two days later had code P0128 thermostat. Went to dealership and they replaced thermostat under warranty. Picked up car two weeks later and everyhting seem normal but when I drove it seem dealership flashed back to stock ecu.
