2018 Mercedes-Benz GLC-Class problems
The 2018 Mercedes-Benz GLC-Class has 98 NHTSA owner complaints and no active recalls. Here's where owners say it breaks.
The 2018 Mercedes-Benz GLC-Class has 98 NHTSA owner complaints on file (U.S. federal records, as of August 2026). The most-reported system is engine at 18 complaints, typically surfacing around 10,600 miles (~$3,100 to repair). Source: NHTSA Office of Defects Investigation.
| Model year | Owner complaints | Recalls |
|---|---|---|
| 2016 GLC-Class | 138 | 0 |
| 2017 GLC-Class | 115 | 0 |
| 2018 GLC-Class (this page) | 98 | 0 |
| 2019 GLC-Class | 67 | 0 |
| 2020 GLC-Class | 77 | 0 |
Solid reliability overall. Common issues are concentrated in a few systems.
Buyable on the data — keep up the usual maintenance and inspect normally.
- No systemic severe-failure pattern in the complaint record
- Reliability score 7.8/10 — above the segment average
Our read of the federal NHTSA complaint and recall record for this exact year and model — not a substitute for a pre-purchase inspection. How we score.
NHTSA crash-test safety ratings 5 / 5 overall
Driver-assist features on the tested model: Electronic stability control: Standard · Forward collision warning: Optional · Lane departure warning: Optional
Source: NHTSA New Car Assessment Program — tested configuration: 2018 Mercedes-Benz GLC-Class SUV 4WD. Stars rate crash protection in NHTSA's tests, not overall reliability — see the owner-complaint data below for what actually goes wrong.
Buying a used 2018 Mercedes-Benz GLC-Class? Check these first
Here's what this model is known to do — so you can inspect for it, price it in, or make the seller fix it before you sign.
What to inspect on this specific car
- engine — 18 owner reports · tends to show around 10,600 mi · ~$3,100 to fix
- electrical — 14 owner reports · tends to show around 11,041 mi · ~$850 to fix
- powertrain — 10 owner reports · tends to show around 34,400 mi · ~$2,500 to fix
- body — 8 owner reports · tends to show around 17,370 mi · ~$1,500 to fix
⚠ The one to take seriously: engine is flagged severe on this model , showing up around 10,600 mi. Inspect it closely on a test drive.
Recalls to confirm are done
Run the VIN from the listing — no active recalls on this model right now, but confirm none were opened after this car was built.
Verdict for buyers: 7.8/10 model. The priciest documented failure is engine (~$3,100) — get the seller's service records for it or inspect closely. Otherwise an average-risk used buy at a fair price.
We tell you what this model is known for and what to inspect — a vehicle-history report tells you what this exact car has been through. Smart buyers get both.
See the full pre-purchase inspection checklist →Ask anything about your 2018 Mercedes-Benz GLC-Class
A noise, a warning light, a repair quote, "should I buy this?" — get an answer grounded in this vehicle's actual NHTSA record, not generic advice.
Answers use this vehicle's NHTSA complaint & recall record — owner-reported and unverified, not a diagnosis. Verify anything safety-critical with a mechanic.
Top trouble spots 8 categories with 3+ complaints
What owners are saying recent NHTSA-filed complaints · verbatim
The contact's friend owns a 2018 Mercedes-Benz GLC 300. The contact stated that while the owner was driving at an undisclosed speed, the accelerator pedal was depressed, but the vehicle failed to accelerate as intended, and the gear shifter independently shifted to neutral(N).…
Check engine light came on with code P052E : Positive Crankcase Ventilation Regulator Valve Performance.
Vehicle experienced transmission shifting issue after having driven for a period of 15 - 20 minutes, with engine oil temp reaching above 103/105 degrees C, transmission won't shift into Drive. Automatically pops into Neutral. Other times engine will stall, required complete…
The contact owns a 2018 Mercedes-Benz GLC300. The contact stated that while driving at various speeds, the steering wheel malfunctioned, and became difficult to turn in either direction. The vehicle was taken to the local dealer who diagnosed that the electronic power steering…
Estimate your repair exposure
Drag to your current mileage. Numbers are derived from this vehicle's complaint history.
Common questions
Is the 2018 Mercedes-Benz GLC-Class reliable?
Mostly yes. With a reliability score of 7.8 out of 10 based on 98 owner complaints filed with NHTSA, the 2018 Mercedes-Benz GLC-Class is generally a sound vehicle. The areas to watch are listed in the top problem section above — most are budget items, not deal-breakers.
Should you avoid the 2018 Mercedes-Benz GLC-Class?
On the NHTSA data, the 2018 Mercedes-Benz GLC-Class does not need avoiding. Buyable on the data — keep up the usual maintenance and inspect normally. The record behind that call: No systemic severe-failure pattern in the complaint record; Reliability score 7.8/10 — above the segment average. This is our read of the federal complaint and recall data — not a substitute for a pre-purchase inspection.
What should I check before buying a used 2018 Mercedes-Benz GLC-Class?
Inspect the engine first — it's the most-reported issue on this model, with 18 owner complaints filed. Typical failure occurs around 10,600 miles. Average repair cost runs about $3,100 at an independent shop. Also confirm any open recalls have been completed by running the VIN, and ask for service records covering the problem areas listed above.
Is the 2018 Mercedes-Benz GLC-Class a good used car to buy?
It scores 7.8 out of 10 on our NHTSA-based read of 98 owner complaints. The main thing to watch is engine. Typical failure occurs around 10,600 miles. Priced fairly and clean on inspection, it's a reasonable used buy. Our data covers what this model is known for — pair it with a vehicle-history report on the VIN to see what that specific car has been through.
What's the most common problem on the 2018 Mercedes-Benz GLC-Class?
Based on NHTSA records, the most-reported issue is engine, with 18 complaints filed. Typical failure occurs around 10,600 miles. Average repair cost runs about $3,100 at an independent shop.
What's the most expensive thing that goes wrong?
The engine is one of the costlier repair items. Average repair cost runs about $3,100 at an independent shop. Typical failure occurs around 10,600 miles. Catching early warning signs can sometimes extend life by 20–30,000 miles.
How do I check if my Mercedes-Benz GLC-Class has open recalls?
Paste your VIN into the decoder at the top of this page. We pull live from NHTSA, so you'll see exactly which campaigns apply to your vehicle and whether the dealer has logged the fix. Recall repairs are always free regardless of mileage or warranty status.
Is an extended warranty worth it on a 2018 Mercedes-Benz GLC-Class?
Math is straightforward: a quality service contract runs $1,800–3,500 over 3 years. With 98 complaints on file and the costliest repair averaging $3,100, one major failure more than pays for it. The catch is reading the contract — many providers exclude wear items and require pre-authorization, so cheaper plans are not always better value.