2023 Mercedes-Benz GLC 300 4MATIC problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
9 owner complaints analyzed
4 distinct recall campaigns
39,000 mi median reported failure mileage
Scope: 2023 model year. Data snapshot: . 1 complaints include usable failure mileage.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Unknown Or Other is the most frequently named component, appearing in 4 of 9 complaints (44.4%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 2 | 22.2% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Unknown Or Other | 4 |
| Service Brakes, Hydraulic | 2 |
| Structure:Body | 2 |
| Equipment:Electrical:Infotainment | 1 |
| Forward Collision Avoidance: Adaptive Cruise Control | 1 |
| Forward Collision Avoidance: Automatic Emergency Braking | 1 |
| Power Train | 1 |
| Vehicle Speed Control | 1 |
Unknown Or Other: 4; Service Brakes, Hydraulic: 2; Structure:Body: 2; Equipment:Electrical:Infotainment: 1; Forward Collision Avoidance: Adaptive Cruise Control: 1; Forward Collision Avoidance: Automatic Emergency Braking: 1; Power Train: 1; Vehicle Speed Control: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 0 |
| 25,000 to 49,999 | 1 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 0; 25,000 to 49,999: 1; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
25,000 to 49,999 miles has the most reports with usable mileage (1). 8 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2025 | 4 |
| 2026 | 5 |
2025: 4; 2026: 5
Pattern summary
Unknown Or Other leads the component reports. Braking behavior appears in 2 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11747647 · 2026-07-01 (July 1, 2026)
My 2023 GLC300 suffered a severe, unprovoked emergency brake deployment in traffic, nearly causing a pileup. on [XXX]. The car has only 14,500 miles and has a chronic history of dangerous, unprovoked Active Brake Assist deployments. It broke down twice in its first month of ownership for other reasons, slammed on the brakes during a left-hand turn last year, nearly causing an accident and on [XXX] executed a violent, full-lock emergency stop from 25mph in light traffic with no obstacles in sight, nearly causing a multi-car pileup and putting me…
Owner-reported narrative. Look up ODI 11747647 at NHTSA ↗
Owner report 11752677 · 2026-07-24 (July 24, 2026)
The contact owns a 2023 Mercedes-Benz GLC 300 4MATIC. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed; however, the brake pedal felt as if it had released, and the vehicle failed to stop as needed. The contact stated that the failure was a recurring failure. The dealer was contacted but could not duplicate the failure. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 39,000.
Owner-reported narrative. 39,000 miles reported. Look up ODI 11752677 at NHTSA ↗