The contact owns 2015 Mercedes-Benz GL450. The contact stated that the check engine warning light was illuminated. The vehicle was taken to the dealer, where DTC code: P060A00 was retrieved. The dealer determined that the solenoid valve had failed and needed to be replaced. The contact related the failure to TSB Number: 37 13 17 2029027/8. The vehicle was not repaired. The manufacturer was not…
2015 Mercedes-Benz GL-Class engine problems
severe 9 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Complaints
9
Recalls
0
Avg fix
$3,100
1fire
1injury
When does it fail?
Of the 9 engine complaints filed for the 2015 Mercedes-Benz GL-Class, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Among the 8 model years of Mercedes-Benz GL-Class in our records for engine problems, this one ranks #2 by owner-complaint volume.
Engine accounts for 26% of all owner complaints filed against this vehicle, across 3 categories tracked.
What owners are reporting 5 most recent
My 2015 GL550 has 90k miles on it and is city driven, on 09/11/2023 when I was trying to pull out onto a main rd my suv hesitated and the check engine light came on, luckily traffic wasn’t heavy at the time so I wasn’t in any accidents. I called and was able to get my suv into my local Mercedes dealership for an inspection. When the suv was dropped off the check engine light had gone off but when…
To Whom It May Concern: I am writing to formally request the National Highway Traffic Safety Administration’s assistance regarding a critical safety defect in my 2015 Mercedes‑Benz GL 450 (M278 engine). I purchased this vehicle in October 2024 with 76,000 miles, and it now has about 87,000 miles. Alarmingly, I recently received a quote for $13,000 to repair a camshaft failure and extensive…
Took to South Bay Mercedes dealer in Torrance because of engine light on. Cause: "Obsolete CDI Control Unit Software" Repair: "Updated to latest software version" Charge: $224.99 because "not covered by Emissions Warranty Extension" Do not understand how Mercedes Benz does not provide a critical software upgrade for free or under a recall? Modifications to the diesel engine and its…
See attached document for complaint
Had engine trouble with your 2015 Mercedes-Benz GL-Class?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2015 Mercedes-Benz GL-Class?
It's a meaningful issue. 9 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Based on the 9 complaints filed, engine issues most often appear around 105,077 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2015/Mercedes-Benz/GL-Class.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.