novae500

wow.. i need to keep an eye on mine and see if i have any rough idling.....

cowboys2322

My 15 GL63 is at Mercedes for this #5 misfire now....:-( CEL light would come and go.... awaiting the compression test results..

mskimd

I spoke to MB USA. I got the whole run around. I cited the above mentioned service bulletin. The managers just said that service bulletin is not a recall. No help from them whatsoever. Wait that’s not true, I got a coupon for $1000 off a new vehicle or $500 for used. 👍 Thanks MB. They basically told me I don’t have a long established relationship with them so they weren’t going to help me out. Pretty much what I have come to expect from MB. No surprise there. Your mileage may vary. Hopefully you are still under warranty.

This should not deter anyone from calling and giving them a hard time. The notes complaints they hear, the more they may take this seriously.

zeroroadkill

Interesting the GL 63 is a different engine they must be having this problem with all cylinder heads on the V-8’s? They’ll do a borescope the pull the plugs and scope each cylinder.

mskimd

Same 8 cylinder BiTurbo engine for GL63 and gl450, the M278.

zeroroadkill

oh I thought the 2015 GL 63 had the earlier 5.5 L V8 bi-turbo whereas the 2015 GL 550 Has the 4.7 L V8 bi-turbo. The GL 63 I think is rated at 550 hp and the GL 550 is rated at 429 hp that’s why I want to put a tune on mine!!!

from mbz
The GL450 has a twin-turbo, 362-horsepower 3.0-liter V6, and the GL550has a twin-turbo, 4.7-liter V8 enginethat makes 429 horsepower. The high-performance GL63 AMG has a twin-turbo, 5.5-liter V8 that produces 550horsepower.

mskimd

They transitioned the gl450 from the V8 to the six-cylinder I believe beginning 2016+/- The GL63 m278 engine was tuned so it produced more HP than the GL450 but the engine is the same.

BlownV8

2013 & 2014 GL450 had the same engine as the 550. 2015 and later GL450 has the bi-turbo 6.

arsupisemnet

They don't pull plugs on compression test. All they do is dynamic compression testing through Xentry.

robalo220

I am getting the same issue only with cylinder #8. Same fault code of P03058 and P03008 (which says coil). Do you think it could just be the coil or am I looking at a leaky valve stem and rebuild? I have extended warranty through MB that I purchased from the dealer early on.

Thanks for any info

Tom Larkin

Hey zeroroadkill, I just picked up a 2014 GL450 with engine 278928 30 181426.
Am I affected even though the last 6 digits are different?

Joel Rolley

yes there is a TSB from 2015!!! LI01.30-P-061835 this is a design/manufacturing flaw. Engines should not grenade during the warranty period, PERIOD!! Just happened to me at 100,000. Go to Yelp search Mercedes Benz Walnut Creek (in Walnut Creek, CA) and see my 1 star review. $36,259 for a valve job!!! Can someone say class action?!?!?!!!




i am pulling motor today and heads tomorrow. I THINK the problem is either in assembly on the production line OR the design of having the turbos so freaking close to the exhaust valves on 1 and 5. That combined with the fact they used mechanical (vacuum) wastegate actuators without adequate diversion for the charge air, leading to back pressure issues which would naturally go into the first cylinder available. We'll see after I pull it all. I'm going to make a YouTube video about the M278 failure.

arsupisemnet

You will have to rebuild engine, at least according to last photo I see on your post.

silvergl

I ended up replacing my engine about 7k ago, after a year long saga of being jerked around the dealer and being by MB USA that there is nothing they can do bc they do not own the dealership. Princeton Mercedes had the car numerous times for noise and smoke from the exhaust, each time they told me it was normal. The month after the warranty expired, they send me estimate for a new engine. complete garbage. Anyways had and independent put in a n engine w 20k miles from wrecked gl450.

I have the old engine, I am going to either part it out or get the heads fixed, i found a good place to do it. A porsche shop in central NJ. Then I should have a good engine after that.

Seems a complete shame the way they handle this. I really like driving it, but I am pretty sure I will never buy another Mercedes, especially now that the X7 is available.

simandang

So is this problem on the m157 engine as well? Is there a Vin range or anything?

I have a 2014 G63 with the 5.5 m157 is this engine prone to this issue?

some posters posted wrong info the gl63 has m157 I’ve seen people post they’ve had this issue on the gl63?

never seen it anywhere on any other m156 I’m confused

Chedman13

Yes, some M157 engines - no VIN range known. All depends which AMG engine builder put it together and if they used the faulty press.

If you've gone over 80k miles without any issue, you are most likely safe. My dealership - it's all occurred between 50-60k miles.

xEryx

FYI,

My CLS63 2014 has bad valve stem seals in 2 cylinders, I believe 1 and 2. The car has been smoking since high 50k miles and was consuming around 2.5-3L of oil every 700miles. The dealer quoted 11k to fix, 5k part, 5k labor, and warranty company did not cover due to them not covering seals...

Chedman13

That's crazy - did you get it done? I'm going to buy an aftermarket warranty for when my CPO ELW runs out (I bought the max possible already). If I break even great, but it'll at least give me peace of mind.

silvergl

Agreed, that is crazy. There is a place in NJ that does Porsche heads that will rebuild the heads for several hundred per side. And labor cant be more than $2500. Even in my GL, where the engine has to come out, that is basically all it cost. I have my old heads if you want to a core swap type arrangement. The shop is in Hamilton NJ, probably 90 minutes from you. The machine shop is down the shore. I spent a ton of time researching options on this, let me know if you want any other info.

Chedman13

Thanks, Did you do any "upgrades" while you were in there? Mine had a lot of carbon build up so having new heads was nice.

silvergl

I did not, I am more focused on the longevity.

xEryx

Hey,

Yeah, I would love more info. I am actually in the middle of the process now and they have the engine taken apart, otherwise, I would have just taken it down there. The only problem was I thought the warranty would cover it so I took it to the dealer. I can definitely do the head rebuild though, they want 3k for a new cylinder head and 1k for valves just because the seals failed and a set of 16 seals is only $138. The other 1.5k is all in bolts, clamps, oil, coolant, etc... ridiculous.

They're quoting 13hours to remove/install the engine, but 16hours to remove/install cylinder head and some other misc stuff, how does that make any sense?

Is the cylinder head for a GL M278 the same as the M157?

Elric99

BTW, which warranty company was it that failed to cover it?

xEryx

DOWC out of NJ. I have a level 2 coverage which covers quite a bit like all engine internals, trans, turbos, some suspension, eletrical, etc. But the one thing they don't cover in the engine is some dumb $30sh dollar seals. They would have covered the whole repair if it would have been the valves or an issue with the head, but not the rubber seals.

jimcps@aol.com

Hi,
Im having the same issues in CT. with my 2014 ML63.
Id like more info or contact info of the places your recommending. I want to work with someone who’s done this before if possible
Thanks,
Jim