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NHTSA complaint #11678816

This page summarizes an official U.S. National Highway Traffic Safety Administration owner complaint. Use the verification links below to confirm the record directly with NHTSA.

Vehicle

2020 MERCEDES-BENZ GLC 300

Manufacturer

Mercedes-Benz USA, LLC

Components

ENGINE

Dates

Incident: 07/15/2025
Filed: 08/06/2025

Owner complaint summary

With approximately 57,500 miles, the car began idling roughly, misfiring and losing power. The dealership has diagnosed it with a cracked cylinder head which will require a replacement at a cost of $9,765.00. The dealership indicated this is a common issue with the M264 engine (rear wheel driver) in the GLC300 and the M260 engine (the front wheel drive version) has already had a service extension for 15 years/180,000 miles. This type of failure should not occur at this mileage or even significantly more.

This is an owner complaint filed with NHTSA (ODI #11678816). It is not automatically an official recall, investigation outcome, or manufacturer admission unless the complaint text itself describes one.
NHTSA datasets & APIsAll complaints for this vehicleRaw NHTSA JSON (ODI #11678816)Back to reports

Official record ID (ODI): 11678816. This page is the human-readable source link used across afterwarranty. The raw JSON link proxies NHTSA's public API for machine verification; prefer this page when reading the complaint.