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EnginePart report

2021 Freightliner M2 Engine Problems

Complaints
2about this part
Share
25%of 8 total for the year
Median mileage
151,024miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 2 complaints about the engine of the 2021 Freightliner M2, 25% of the 8 complaints for this model year. Where a mileage was given, the median is 151,024 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.

“While driving on the Interstate check-engine light came on, engine governed to very slow speeds and ultimately became undrivable. This has happened twice. In May and August of 2026. According to Velocity Truck Centers in North Las Vegas, NV Engine harness contacted and chafed around air compressor. Vehicle is at Velocity Truck Centers in North Las Vegas, NV. This is the same failure as described in DTNA's recall FL-858.”

NHTSA complaint #11763795, filed 2026-09

“The contact owns a 2021 Freightliner M2. The contact stated that while a driver was driving at an undisclosed speed, the vehicle started decelerating unintendedly and then stalled. There were no warning lights illuminated. The driver was able to coast to the side of the roadway. The driver was unable to restart the vehicle. The vehicle was towed to the dealer who stated that there was an excessive amount of oil in the engine. The dealer determined that the engine had failed and needed to be replaced. …”

NHTSA complaint #11634557, filed 2025-01, 151,024 miles

Engine: other model years

YearComplaintsShare of year
2021225%

Other parts of the 2021 Freightliner M2

Electrical system
3 complaintsTransmission and drivetrain
2 complaintsOther or unknown
1 complaintsTires
1 complaintsVehicle speed control
1 complaints

← All problems reported for the 2021 Freightliner M2

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 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