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EnginePart report

2020 Mercedes-Benz GLB 250 Engine Problems

Complaints
6about this part
Share
11%of 54 total for the year
Median mileage
4,750miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 6 complaints about the engine of the 2020 Mercedes-Benz GLB 250, 11% of the 54 complaints for this model year. Where a mileage was given, the median is 4,750 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.

“On 3/23/2021, my GLB 250 started experiencing electrical and engine issues after I had been stopped at a railroad crossing for 15 minutes with the engine running and the car in park. Once the train passed and I was able to drive, my instrument panel started lighting up with every possible warning light and additional warnings that said to not shift gears and go to dealer immediately. I drove approximately 1 mile and stopped at a stop light, at which time all warnings continued to go off. I could not turn the car on or off, could not shift into any gear, the steering wheel was locked. …”

NHTSA complaint #11404564, filed 2021-03, 8,000 miles

“The engine made a knocking sound and i pulled over on the side of the road took the car to MB dealership to get the recall fixed but i was told the recall cannot be fixed until the engine is fixed. MBUSA refuses to replace the engine even though it is fully covered under warranty. Thus because i cannot get a recall done for my safety unless i get an engine replaced. This is absolutely horrible. MB knows they produced a bad engine and are forcing us to pay out of our pocket then they will fix the recall on the car.”

NHTSA complaint #11594846, filed 2024-06

“Diagnostics performed and found electrical/component fault and possible wire damage to fuel pump. NECC to drain tank and inspect replace fule pump if necc. Oringally took one week prior and diagnostics led to the possiblility that the cylinder head was malfunctioning, which was a manufacturing defect and covered under an extended warranty, but now advised otherwise. Quote $2200.00. Mileage on vehicle 23,660.”

NHTSA complaint #11726066, filed 2026-03

“Car constantly cuts out and loses power as well as occasionally shuts off for no reason. Causing very hazardous driving conditions. I have noticed that this is a common issue stated in online forums with this particular car as well. It is more times than not an issue with the engine head and valves.”

NHTSA complaint #11617187, filed 2024-09

Related service bulletins

Engine: other model years

YearComplaintsShare of year
2023436%
202219%
2021724%
2020611%

Other parts of the 2020 Mercedes-Benz GLB 250

Body and structure
14 complaintsOther or unknown
11 complaintsElectrical system
10 complaintsSuspension
6 complaintsFuel system
5 complaintsAir bags
4 complaintsSteering
4 complaintsVehicle speed control
3 complaintsBack-over prevention (rear camera)
2 complaintsBrakes
2 complaintsTransmission and drivetrain
2 complaintsEquipment
1 complaints

← All problems reported for the 2020 Mercedes-Benz GLB 250

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