Mercedes-Benz GLK reliability: common problems by model year

Across 4 model years, the Mercedes-Benz GLK has 690 owner-filed NHTSA complaints and 0 recalls on record. The most-reported areas are air bags and fuel/propulsion system. 2010 drew the most complaints (241), 2011 the fewest (133).

Source: NHTSA complaints and recalls filed for Mercedes-Benz GLK vehicles (US, public record). Typical used asking price $9,000–$13,245.

Which GLK years have the most problems?

Complaint volume by model year. Raw NHTSA totals, not adjusted for sales volume or time on the road, so older and higher-selling years accumulate more. Every year links to its full breakdown.

Highest: 2010 (241 complaints). Lowest: 2011 (133).

Where owners report problems

What owners say

Sentiment is mixed and heavily dependent on model year, engine choice, and maintenance history. The GLK is praised by a loyal owner base for its distinctive, boxy styling, comfortable and quiet ride quality, solid build quality from the era, and the reliabilit

• High and unpredictable repair costs: very frequent mentions of expensive repairs for electronic modules, steering column locks, suspension components, and emissions systems, often exceeding $1,000 USD per incident.
• Transmission problems: shuddering, fluid mixing with coolant due to radiator failure, CAN bus communication faults, loud thumping during shifts. Frequency: recurrent.
• Electrical/electronic failures: steering column lock (ESL) failure preventing start, various control module communication errors, bizarre behavior after battery replacement (e.g., cooling fan running with key off). Frequency: recurrent.
• Diesel (GLK 250 BlueTEC) specific issues: expensive emissions system repairs (cited at $4,000-$5,000 USD), turbocharger failures, concerns about long-term reliability of the Bluetec system in the US. Frequency: recurrent.
• Engine oil leaks: from camshaft adjuster solenoids (M272 engine), valve cover gaskets, and other seals. Frequency: recurrent.

Owner insights cover all generations of the GLK. Individual model years are broken down above.