C450 limited power error codes
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Member
Joined: Jun 2019
Posts: 84
Likes: 17
W205 AMG C63S
C450 limited power error codes
Hi guys,
My C450 limits power when hot to around 300 hp (220 kW on the center display) and it throws three codes, all related to Power Train:
P026E71 - this one I have managed to find online, it seems to have something to do with Actuation of coolant pump for Charge air cooler
P026E7A
P026E92
the last two I can’t find online, and the OBD reader I have (Carly OBD adapter) offers little to shed light on these. I suspect the charge air temperature gets too hot and the engine reduces power and torque to avoid any serious problem, but that is just a guess based on the one code I can figure out.
Anyone who can tell me what these codes could point to? It is going to the dealer in a couple of days anyway on other business, but it would be nice to know what I’m going in for
thanks for any help!
My C450 limits power when hot to around 300 hp (220 kW on the center display) and it throws three codes, all related to Power Train:
P026E71 - this one I have managed to find online, it seems to have something to do with Actuation of coolant pump for Charge air cooler
P026E7A
P026E92
the last two I can’t find online, and the OBD reader I have (Carly OBD adapter) offers little to shed light on these. I suspect the charge air temperature gets too hot and the engine reduces power and torque to avoid any serious problem, but that is just a guess based on the one code I can figure out.
Anyone who can tell me what these codes could point to? It is going to the dealer in a couple of days anyway on other business, but it would be nice to know what I’m going in for
thanks for any help!
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Joined: May 2013
Posts: 174
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From: Main Line, LBK, LBI, etc
19E450A, 16C450W4, 16RRS SC Dynamic, etc
Did any lights come on in the car? While I can’t help with the codes, yesterday was hot and I felt like my car wasn’t as fast as it should be — I had just gotten out of my RR Sport Supercharged (which is both slower in testing and according to manufacturer’s specs than the C450) and my C450 didn’t feel “quick enough” in comparison, where it has always felt a bit quicker before. I wonder if I have the same issue. I’ll have to scan for codes.
I had tried to check the center display for HP, but there aren’t really places around me I can take my eyes off the road for long enough at full throttle to process what appears on the center display. Also, I wasn’t sure that’d actually be reliable, but it appears it actually is reliable based off your experience (at least relatively).
I had tried to check the center display for HP, but there aren’t really places around me I can take my eyes off the road for long enough at full throttle to process what appears on the center display. Also, I wasn’t sure that’d actually be reliable, but it appears it actually is reliable based off your experience (at least relatively).
Thread Starter
Member
Joined: Jun 2019
Posts: 84
Likes: 17
W205 AMG C63S
Update: Merc had a look at the car today and the intercooler has developed an internal leak causing the cooling fluid for the intercooler (separate from the main engine coolant) to spill into the intake. This had caused the intercooler Cooling system to run low, which in turn had resulted in the cooling water pump for the intercooler to seize up. The three codes were relating to the pump, but the main issue is the leaking intercooler. The lack of coolant meant the engine was limiting the boost pressure (around 7,5 PSI at the most) due to hot charge air and therefore reduced power (270-300 hp depending on the intake air temperature).
Anyway, 1500 bucks out of pocket and I’ll have to live with a C200 until the end of the weekend, but good news is that I wasn’t just paranoid and now the car will come back with full power. We are currently awaiting feedback from MB on whether they will cover some of the bill, but I doubt it given the relatively low cost.
The technician I spoke to did however tell me that this is apparently a known fault and in extreme cases, the leak can worsen significantly and cause copious amounts of water to leak into the engine and there goes the engine. So check the fluid level in the intercooler system (the reservoir is in front of the engine under the cover on your left side) and if it is disappearing, get the intercooler checked.
Anyway, 1500 bucks out of pocket and I’ll have to live with a C200 until the end of the weekend, but good news is that I wasn’t just paranoid and now the car will come back with full power. We are currently awaiting feedback from MB on whether they will cover some of the bill, but I doubt it given the relatively low cost.
The technician I spoke to did however tell me that this is apparently a known fault and in extreme cases, the leak can worsen significantly and cause copious amounts of water to leak into the engine and there goes the engine. So check the fluid level in the intercooler system (the reservoir is in front of the engine under the cover on your left side) and if it is disappearing, get the intercooler checked.
