Warranty Repair - Cylinder Head!
MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,346
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2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
So does it matter? I don’t know.
If your driving is mild urban with no high speed or hard acceleration, the new car advice should be sufficient.
Newbie
Joined: Mar 2025
Posts: 1
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2022 GLB 250 4MATIC
So my check engine light came on the other day. I had to leave for a work trip the next morning but my GF said when she started it the car was rattling like she's never heard before. She took it to Advanced Auto Parts and they ran a test and we got the P219D and P219C codes. I just hit 20k miles and 3 years with the vehicle. Thankfully it sits in the airport parking lot more than it does on the road. I know it'll be covered under the warranty, but will it qualify for the extended coverage since it's not displaying the codes listed in the NCU letter?
MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,346
Likes: 692
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
So my check engine light came on the other day. I had to leave for a work trip the next morning but my GF said when she started it the car was rattling like she's never heard before. She took it to Advanced Auto Parts and they ran a test and we got the P219D and P219C codes. I just hit 20k miles and 3 years with the vehicle. Thankfully it sits in the airport parking lot more than it does on the road. I know it'll be covered under the warranty, but will it qualify for the extended coverage since it's not displaying the codes listed in the NCU letter?
MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,346
Likes: 692
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
I’m duplicating this post here because of the low activity on the GLA forum:
2021 GLA 250 FWD, 50,000 miles.
P030085 (misfiring) & P030485 (misfiring cylinder 4) DTCs appeared suddenly. About 10,000 miles ago the cylinder head was replaced because of the exhaust valve problem seen on the M260/264 engines through 2022 model year.
The problem does not appear when the GLA is first started. After about 2 minutes of either driving or idling, the very rough running starts. Although these 2 codes are associated with an exhaust valve failure, the 2 mixture codes are not present. Since the cylinder head was replaced fairly recently, a repeat of that wasn’t expected. Also, when the exhaust valve failed, the engine did not run this rough and did it immediately on start up.
Has anyone seen this misfiring without the cylinder head/exhaust valve failure? If so where was the problem? Spark plugs? Ignition coils? Injectors?
2021 GLA 250 FWD, 50,000 miles.
P030085 (misfiring) & P030485 (misfiring cylinder 4) DTCs appeared suddenly. About 10,000 miles ago the cylinder head was replaced because of the exhaust valve problem seen on the M260/264 engines through 2022 model year.
The problem does not appear when the GLA is first started. After about 2 minutes of either driving or idling, the very rough running starts. Although these 2 codes are associated with an exhaust valve failure, the 2 mixture codes are not present. Since the cylinder head was replaced fairly recently, a repeat of that wasn’t expected. Also, when the exhaust valve failed, the engine did not run this rough and did it immediately on start up.
Has anyone seen this misfiring without the cylinder head/exhaust valve failure? If so where was the problem? Spark plugs? Ignition coils? Injectors?
I test drove it before returning it to our driver. It felt like the GLA I drive. She says it feels better than before which may be an indication that something had been going wrong for a while.
Newbie
Joined: May 2025
Posts: 2
Likes: 0
2021 GLC 300. 2021 GLE 350
Head warpage on low mileage 2021 4 cylinder
The vehicle is not covered at all and I got corporate to pitch in $1000 and the dealer pitched in $1500 for the constant belly aching and when it came time to pay up it was still $8000 bucks and I didn’t see any reduction of price really at all. The Mercedes people are so full of crap on every level!!
My question is why don’t they simply issue a recall or give people extensions on the warranty …or SOMETHING?? No effort to was made to help a customer who’s been driving Mercedes for 50 years. They simply acted like they couldn’t care less. I’m furious as many people are on this forum alone.
I do believe it’s time for a lawsuit to force them Mercedes under supeona to finally disclose how many issues have occurred.
My question is why don’t they simply issue a recall or give people extensions on the warranty …or SOMETHING?? No effort to was made to help a customer who’s been driving Mercedes for 50 years. They simply acted like they couldn’t care less. I’m furious as many people are on this forum alone.
I do believe it’s time for a lawsuit to force them Mercedes under supeona to finally disclose how many issues have occurred.
Senior Member
Joined: Jul 2021
Posts: 490
Likes: 176
2021 Glb35 AMG (2013 GLK 350)
Which vehicle, GLB? GLA/GLB are under warranty extension, not GLC/GLE.
The vehicle is not covered at all and I got corporate to pitch in $1000 and the dealer pitched in $1500 for the constant belly aching and when it came time to pay up it was still $8000 bucks and I didn’t see any reduction of price really at all. The Mercedes people are so full of crap on every level!!
My question is why don’t they simply issue a recall or give people extensions on the warranty …or SOMETHING?? No effort to was made to help a customer who’s been driving Mercedes for 50 years. They simply acted like they couldn’t care less. I’m furious as many people are on this forum alone.
I do believe it’s time for a lawsuit to force them Mercedes under supeona to finally disclose how many issues have occurred.
My question is why don’t they simply issue a recall or give people extensions on the warranty …or SOMETHING?? No effort to was made to help a customer who’s been driving Mercedes for 50 years. They simply acted like they couldn’t care less. I’m furious as many people are on this forum alone.
I do believe it’s time for a lawsuit to force them Mercedes under supeona to finally disclose how many issues have occurred.
Junior Member
Joined: Nov 2023
Posts: 30
Likes: 9
From: New York
2023 GLB250
I purchased extended manufacturer warranties for our last 4 vehicles. With cars getting more and more electronic systems, I don’t feel comfortable keeping a car for 6 years without a warranty protection. With a little research you can usually negotiate a price down for EMW at the time of purchase.
What kind if research did you do and how did you go about to negotiate your EMW? I'm asking because I can refer to your help as future reference.
Super Member
Joined: Jan 2021
Posts: 557
Likes: 204
2021 Mercedes GLB250 4Matic
At the time I told FM what quotes I got and negotiated from there. Ended up paying $50 over what I got from online dealer.
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Newbie
Joined: Jun 2025
Posts: 1
Likes: 0
GLB250
Just had my ‘21 GLB250 have the dreaded cylinder head issue. Miles 51800, dealer gave usual speal of you’ll have to pay for diagnostic if not the issue you think. They updated me a day later saying good news your issue was diagnosed and is covered under the extended warranty MB has issued for these parts.
parts ordered installed, vehicle is good as new. No issues getting the service covered after the warranty has expired.
im surprised it lasted 51k without failure. Compression loss was 90% on cylinder 2 so it had to be degrading for awhile.
parts ordered installed, vehicle is good as new. No issues getting the service covered after the warranty has expired.
im surprised it lasted 51k without failure. Compression loss was 90% on cylinder 2 so it had to be degrading for awhile.
Last edited by knightfal16; Jun 12, 2025 at 04:55 PM.
Member
Joined: May 2020
Posts: 95
Likes: 21
GLB, GLA
My 2020 GLB250 4Matic engine blew up!!!
Got my 2020 GLB250 4Matic fixed by an MB dealer.
Lucky for me the engine valves and cylinder head was repaired WITH ZERO OUT OF POCKET for me EXCEPT the cost of 4 spark plugs (around $90 something).
They also fixed the front suspension subassembly and front and rear control arms and updated the MBUX system ALL WITH NO CHARGE TO ME! Plus a 4 wheel alignment free.
I did have MB FACTORY EXTENDED WARRANTY.
I don’t know if they would be this generous if I did not?!
Also the engine repair now got an extended warranty to 15 years or 150K miles from the date of first put into service REGARDLESS OF OWNERSHIP.
I don’t want to take any risks or headaches dealing with this in the future. Therefore I sold it right away to another dealer.
I’m going back to Lexus!!
Lucky for me the engine valves and cylinder head was repaired WITH ZERO OUT OF POCKET for me EXCEPT the cost of 4 spark plugs (around $90 something).
They also fixed the front suspension subassembly and front and rear control arms and updated the MBUX system ALL WITH NO CHARGE TO ME! Plus a 4 wheel alignment free.
I did have MB FACTORY EXTENDED WARRANTY.
I don’t know if they would be this generous if I did not?!
Also the engine repair now got an extended warranty to 15 years or 150K miles from the date of first put into service REGARDLESS OF OWNERSHIP.
I don’t want to take any risks or headaches dealing with this in the future. Therefore I sold it right away to another dealer.
I’m going back to Lexus!!
Last edited by GLB4US; Oct 31, 2025 at 07:09 PM.
Super Member
Joined: Mar 2011
Posts: 998
Likes: 136
From: VA
W212 E-class, W211 E-class, F10 5-Series
Hey guys, I have a 2022 glb 250 and have this issue as well. I took it to the dealership and they said they are "covering the cylinder head", but here's where it gets interesting...
They are saying I also need to replace the spark plugs, and the intake camshafts, and the rollers, and the rocker arms, and the lifters...and would "only charge me for parts because they already have the engine open" and those above parts would only cost me $3500. Seems like they are trying to upsell me on all that.
is this normal that I would need to replace all that stuff as well, and has anyone ever had a similar issue? What would be the cost to get all of that additional work done? Just trying to make sure they aren't taking advantage of me and trying to get extra money, since they have to cover the cylinder head.
They are saying I also need to replace the spark plugs, and the intake camshafts, and the rollers, and the rocker arms, and the lifters...and would "only charge me for parts because they already have the engine open" and those above parts would only cost me $3500. Seems like they are trying to upsell me on all that.
is this normal that I would need to replace all that stuff as well, and has anyone ever had a similar issue? What would be the cost to get all of that additional work done? Just trying to make sure they aren't taking advantage of me and trying to get extra money, since they have to cover the cylinder head.
Last edited by tresean1; Apr 28, 2026 at 01:29 PM.
MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,346
Likes: 692
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
Hey guys, I have a 2022 glb 250 and have this issue as well. I took it to the dealership and they said they are "covering the cylinder head", but here's where it gets interesting...
They are saying I also need to replace the spark plugs, and the intake camshafts, and the rollers, and the rocker arms, and the lifters...and would "only charge me for parts because they already have the engine open" and those above parts would only cost me $3500. Seems like they are trying to upsell me on all that.
is this normal that I would need to replace all that stuff as well, and has anyone ever had a similar issue? What would be the cost to get all of that additional work done? Just trying to make sure they aren't taking advantage of me and trying to get extra money, since they have to cover the cylinder head.
They are saying I also need to replace the spark plugs, and the intake camshafts, and the rollers, and the rocker arms, and the lifters...and would "only charge me for parts because they already have the engine open" and those above parts would only cost me $3500. Seems like they are trying to upsell me on all that.
is this normal that I would need to replace all that stuff as well, and has anyone ever had a similar issue? What would be the cost to get all of that additional work done? Just trying to make sure they aren't taking advantage of me and trying to get extra money, since they have to cover the cylinder head.
BTW - I saw the second head for the GLA 250 come out of the box. It had a what looked like a complete valve train and spark plugs, but no camshafts or coils.
Last edited by Odd Piggy; Apr 28, 2026 at 09:43 PM.
Super Member
Joined: Mar 2011
Posts: 998
Likes: 136
From: VA
W212 E-class, W211 E-class, F10 5-Series
We have had 3 M260 engine failures: ‘21 GLB 250, ‘21 GLA 250 that failed twice. The dealer gave me a similar story on the GLB 250 but covered everything because it was still under the 4/50 main warranty. On the GLA 250 the first failure was during the 4/50 warranty and they didn’t mention anything. The second failure on the GLA 250 was under the extended warranty and the same dealer fixed everything with no cost to us.
MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,346
Likes: 692
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
On the GLB250, the spark plugs and valve train were replaced. The original cams were reused. It’s been 70k+ miles and hasn’t broken again.
On the GKA250 second repair, everything, spark plugs, valve train, camshafts were replaced.
Three repairs to M260 engines (3 out of 4 broke) and nothing out of pocket.
