2019 Mercedes-Benz GLS 450 Engine Problems
- Complaints
- 3about this part
- Share
- 12%of 25 total for the year
- Median mileage
- 13,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the engine of the 2019 Mercedes-Benz GLS 450, 12% of the 25 complaints for this model year. Where a mileage was given, the median is 13,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Driving on freeway at ̃75mph toward 202 w arizona freeway, dashboard showed a engine malfunction + 48 v battery see operator's manual:. 1 minute later another error on screen saying, coolant off turn engine off. Then the car lost the power in the middle lane off freeway. Luckily no cars behind us. Car in service at mercedes dealer in chandler az”
NHTSA complaint #11288497, filed 2019-12, 13,000 miles“I am reporting a serious safety defect in my 2019 Mercedes-Benz GLS450. My vehicle experienced low oil pressure warnings and engine warning lights, which were diagnosed as a faulty oil pump solenoid valve. The repair required removing major engine components, resulting in a cost of $5,000 that I paid personally. It is important to note that Mercedes-Benz updated the valve design in the following model year, indicating that the company was aware of a defect in the original design. …”
NHTSA complaint #11739507, filed 2026-05Related service bulletins
- 11038185Sep 26, 2026Complaint Sporadic warning message in instrument cluster "Engine oil pressure, stop switch off vehicle" (or similar) is shown in red on vehicles with low mileage. Cause…
- 11028807Feb 14, 2026Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the engine control unit software does not correspond to current…
- 11015545Mar 4, 2025Complaint Check engine light illuminated Fault code present in MRG3 control unit P22C800 or P22C900 - The valve of the exhaust gas turbocharger is jammed. Cause Check valve in…
- 11012056Dec 19, 2024Complaint Check engine light illuminated Fault code present in MRG3 control unit P22C900 - The valve of the exhaust gas turbocharger is jammed closed. Cause Check valve in charge…
- 11012055Dec 19, 2024Complaint Low engine oil level warning. Engine oil leak under vehicle. Cause Rear crankshaft radial seal rolled during installation Remedy -Check for external oil leak with…
- 11010744Nov 19, 2024Complaint Engine cooling fan running for an extended time after switching off vehicle. Cause Optimized thermal management in latest PTCU software. Remedy This is a normal…
- 11005347Jul 31, 2024Complaint Yellow coolant warning system message appears in instrument cluster. Fault code P048392 or P048397 present in N127 Powertrain Control Unit. Cause Faulty communication…
Engine: other model years
Other parts of the 2019 Mercedes-Benz GLS 450
7 complaintsElectrical system
4 complaintsEngine cooling
3 complaintsTransmission and drivetrain
3 complaintsAir bags
2 complaintsBack-over prevention (rear camera)
2 complaintsBrakes
2 complaintsBody and structure
2 complaintsSuspension
2 complaintsFuel system
1 complaintsSteering
1 complaintsTires
1 complaints
← All problems reported for the 2019 Mercedes-Benz GLS 450
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology