Is the 2018 Mercedes-Benz GLC 300 reliable?

The 2018 Mercedes-Benz GLC 300 has 123 complaints filed with NHTSA (1.5x the segment average). Our reliability verdict: avoid. Most common issue: ENGINE problems.

What are common problems with the 2018 Mercedes-Benz GLC 300?

Top problems: ENGINE (27 complaints, avg repair $500); OTHER (20 complaints, avg repair $500); ELECTRICAL (13 complaints, avg repair $500). Issues typically appear around 50K miles.

Are there any recalls on the 2018 Mercedes-Benz GLC 300?

Yes, there are 12 recall(s): STRUCTURE:BODY:ROOF AND PILLARS, AIR BAGS:FRONTAL:DRIVER SIDE:INFLATOR MODULE, AIR BAGS:FRONTAL, VISIBILITY:SUN/MOON ROOF ASSEMBLY, ELECTRICAL SYSTEM:SOFTWARE, COMMUNICATION, ELECTRICAL SYSTEM:SOFTWARE, STRUCTURE:BODY:ROOF AND PILLARS, AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION, STRUCTURE:BODY:ROOF AND PILLARS, EXTERIOR LIGHTING:TURN SIGNAL, STRUCTURE:BODY:ROOF AND PILLARS. Contact any Mercedes-Benz dealer to verify if recalls have been completed on your specific vehicle.

How much does it cost to fuel a 2018 Mercedes-Benz GLC 300?

The 2018 Mercedes-Benz GLC 300 gets 24 MPG combined. At current US average gas prices, driving 12,000 miles per year costs roughly $2000. See the interactive fuel cost calculator on this page for state-specific pricing.

How much does it cost to insure a 2018 Mercedes-Benz GLC 300?

Estimated US average full-coverage insurance for the 2018 Mercedes-Benz GLC 300 is approximately $2,260/year (suv-luxury class). Actual quotes vary heavily by state, driver age, driving record, and credit — see the interactive insurance estimator on this page for state-specific pricing.

2018 Mercedes-Benz GLC 300

Problems, Recalls & Reliability Report

Avoid This Year

Quick Summary

The 2018 Mercedes-Benz GLC 300 has 123 owner complaints filed with NHTSA — that's 1.5x the segment average of 84. The most common issue is engine problems (22% of all complaints), specifically: tl* the contact owned a 2018 mercedes-benz glc300. while driving 55 mph, the rear driver's side tire was punctured. the contact stated that the vehicle was equipped with 18 inch run flat tires. the contact pulled the vehicle over to the side of the road. after waiting approximately 70 minutes on the. There are 12 recalls issued for this model year. ⚠️ 2 fire reports filed.

2 fire reports 6 crash reports 2 injuries

123

Total Complaints

Recalls Issued

—/5

Safety Stars

1.5x

vs Segment Avg

Known Problems(top 5 of 8)

ENGINE

27 complaints

22%

• TL* THE CONTACT OWNED A 2018 MERCEDES-BENZ GLC300. WHILE DRIVING 55 MPH, THE REAR DRIVER'S SIDE TIRE WAS PUNCTURED. THE CONTACT STATED THAT THE VEHICLE WAS EQUIPPED WITH 18 INCH RUN FLAT TIRES. THE CONTACT PULLED THE VEHICLE OVER TO THE SIDE OF THE ROAD. AFTER WAITING APPROXIMATELY 70 MINUTES ON THE
• 'THE FIRST INCIDENT - OCCURRED IN AUGUST WHEN I STOPPED AT A STOP-LIGHT. I STARTED DRIVING WHEN THE LIGHT TURNED GREEN AND THE CAR WAS ACCELERATING AS NORMAL. THERE WERE CARS BEHIND ME ACCELERATING AS WELL AS NORMAL. MY SUV AUTOMATICALLY SHIFTED FROM DRIVE TO NEUTRAL BY ITSELF AS I CONTINUE TO ACCEL
• P052E postive crankcase ventilation regulator valve

Typical onset: 50K miles Est. repair: $500🔥 1 fire reports

“TL* THE CONTACT OWNED A 2018 MERCEDES-BENZ GLC300. WHILE DRIVING 55 MPH, THE REAR DRIVER'S SIDE TIRE WAS PUNCTURED. THE CONTACT STATED THAT THE VEHICLE WAS EQUIPPED WITH 18 INCH RUN FLAT TIRES. THE CONTACT PULLED THE VEHICLE OVER TO THE SIDE OF THE ROAD. AFTER WAITING APPROXIMATELY 70 MINUTES ON THE”

— NHTSA complaint filing

When Problems Appear on the 2018 Mercedes-Benz GLC 300

Based on 42 owner complaints that included an odometer reading. Median mileage at time of complaint: 10K miles. Most complaints cluster in the 0-30K miles range.

Overall complaint distribution by mileage

0-30K

30-60K

60-100K

100-150K

150-200K

200K+

BODY/STRUCTURE

In line with typicalmedian 16K mi · 5 reports

0-30K

30-60K

60-100K

100-150K

150-200K

200K+

BRAKES

In line with typicalmedian 7K mi · 5 reports

0-30K

30-60K

60-100K

100-150K

150-200K

200K+

OTHER

In line with typicalmedian 323 mi · 5 reports

0-30K

30-60K

60-100K

100-150K

150-200K

200K+

Mileage figures are self-reported by owners in NHTSA complaint filings. Peak bucket = the mileage range with the most complaints for that component; it reflects when owners noticed and reported problems, not necessarily when the fault first occurred.

Recalls (12)

STRUCTURE:BODY:ROOF AND PILLARS15/03/2018

Mercedes Benz USA LLC (MBUSA) is recalling certain 2017-2018 GLC43 AMG, 2016-2018 GLC300 4Matic, 2016-2018 GLC300, 2018 GLC63 AMG 4Matic, and 2018 GLC350e 4Matic vehicles. The seat belt latch plates (the parts that insert into the buckles) for the outboard rear seats may retract into the interior paneling, preventing the occupants from being able to use the seat belts.

Risk: If the rear seat passengers cannot fasten their seat belts, they have an increased risk of injury in the event of a crash.

Fix: MBUSA will notify owners, and dealers will install a buffer to the c-pillar paneling, free of charge. The recall is expected to begin May 14, 2018. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2018030012.

Fuel Cost Calculator for 2018 Mercedes-Benz GLC 300

Live EIA prices

Annual miles driven: 12,000

Your state (affects local gasoline price)

Per year

$2,001

Per month

$167

Per mile

16.7¢

MPG

City driving (worst-case MPG)

$2,182/yr

Highway driving (best-case MPG)

$1,715/yr

Based on EPA fuel-economy ratings and EIA weekly retail prices (2026-07-20). Real-world cost varies with driving style, trim/engine, terrain, and traffic.

5-Year Gas Price History

EIA weekly retail data · 2021 → today

Show:

Current

$4.00

5-year low

$2.78

5-year high

$5.01

Since 2021

+27%

Source: US Energy Information Administration weekly retail gasoline prices.

Estimated Insurance Cost for 2018 Mercedes-Benz GLC 300

Estimate only, not a quote. Modeled from NAIC + HLDI averages for a hypothetical 35-year-old driver with clean record + full coverage. Your actual quote depends heavily on your age, driving history, credit, ZIP code, and insurer.

Your state (affects local premium average)

Full coverage / year

$2,260

Full coverage / month

$188

Liability only / year

$732

vs US avg

+35%

How this estimate is calculated

US base full-coverage premium$1674

× state (US)1.00x

× vehicle class (suv-luxury)1.35x

× theft risk1.00x

× safety rating1.00x

× vehicle age1.00x

= Full coverage estimate$2260

Coverage assumed: 100/300/100 liability + comprehensive/collision, $500 deductibles. Data sources: NAIC 2024 + HLDI loss studies.

Maintenance & Warranty

Recommended Mercedes-Benz GLC 300 Service Intervals

Oil change

10K mi / 12 mo

Tire rotation

10K mi

Brake fluid

24 months

Transmission fluid

40K mi

Engine coolant

150K mi

Spark plugs

60K mi

Cabin air filter

20K mi

Engine air filter

40K mi

Differential (AWD/4WD)

40K mi

Service A / Service B alternating schedule. Requires MB-approved oil (229.5 spec typically).

"Severe service" conditions (heavy towing, extreme temps, city stop-and-go) typically halve these intervals. Always consult your vehicle's owner's manual for the authoritative schedule.

Mercedes-Benz New-Vehicle Warranty Coverage

Bumper-to-bumper (basic)

4 yr / 50K mi

Powertrain

4 yr / 50K mi

Hybrid/EV battery

10 yr / 155K mi

Corrosion (rust perforation)

4 yr / 50K mi

Roadside assistance

4 yr / unlimited mi

EQ EV battery warranty is 10 years/155,000 miles

These are the terms for a new Mercedes-Benz. If you're buying a used 2018 GLC 300, remaining coverage is usually pro-rated from the vehicle's original in-service date. Not all coverage transfers between owners — check with a Mercedes-Benz dealer for VIN-specific remaining warranty.

Estimated Repair Costs

ENGINE(~50K mi)

$500

OTHER(~50K mi)

$500

ELECTRICAL(~50K mi)

$500

BODY/STRUCTURE(~50K mi)

$500

TRANSMISSION(~50K mi)

$500

Estimates based on average reported repair costs. Actual costs vary by location, shop, and severity.

🔍 Pre-Purchase Inspection Checklist

Based on 123 owner complaints for this specific year, here's what to check or ask about:

☐
ENGINE: TL* THE CONTACT OWNED A 2018 MERCEDES-BENZ GLC300. WHILE DRIVING 55 MPH, THE REAR DRIVER'S SIDE TIRE WAS PUNCTURED. THE CONTACT STATED THAT THE VEHICLE WAS EQUIPPED WITH 18 INCH RUN FLAT TIRES. THE CONTACT PULLED THE VEHICLE OVER TO THE SIDE OF THE ROAD. AFTER WAITING APPROXIMATELY 70 MINUTES ON THE
Typically appears around 50K miles. Repair cost ~$500
☐
OTHER: MY HEEL GOT STUCK WHEN PRESSING THE GAS PEDAL CREATING A SAFETY HAZARD. MY SHOE WAS STUCK AND I HAD TO DRIVE BAREFOOT. I TOOK IT TO THE MERCEDES CALABASAS DEALERSHIP AND THEY SAID THERE WAS NOTHING THEY COULD DO AND I SHOULD NOT WEAR HEELS WHEN DRIVING. I HAVE DRIVEN FOR OVER 30 YEARS WITH NO ISSUES
Typically appears around 50K miles. Repair cost ~$500
☐
ELECTRICAL: TL* THE CONTACT OWNS A 2018 MERCEDES-BENZ GLC300. THE CONTACT STATED THAT THE VEHICLE DOORS AUTOMATICALLY LOCKED WITH THE KEYS INSIDE OR OUTSIDE OF THE VEHICLE. THE VEHICLE WAS TAKEN TO MERCEDES-BENZ OF ALEXANDRIA (200 S PICKETT ST, ALEXANDRIA, VA 22304, (703) 341-2100) FOR DIAGNOSTIC TESTING AND RE
Typically appears around 50K miles. Repair cost ~$500
☐
BODY/STRUCTURE: TL* THE CONTACT OWNED A 2018 MERCEDES-BENZ GLC300. WHILE DRIVING 55 MPH, THE REAR DRIVER'S SIDE TIRE WAS PUNCTURED. THE CONTACT STATED THAT THE VEHICLE WAS EQUIPPED WITH 18 INCH RUN FLAT TIRES. THE CONTACT PULLED THE VEHICLE OVER TO THE SIDE OF THE ROAD. AFTER WAITING APPROXIMATELY 70 MINUTES ON THE
Typically appears around 50K miles. Repair cost ~$500
☐
RECALLS: Verify all 12 recalls have been completed — free at any Mercedes-Benz dealer
☐
General: Get a pre-purchase inspection from an independent mechanic ($100-$200)