Is the 2021 Mercedes-Benz GLC 300 reliable?

The 2021 Mercedes-Benz GLC 300 has 84 complaints filed with NHTSA (1.0x the segment average). Our reliability verdict: average. Most common issue: ENGINE problems.

What are common problems with the 2021 Mercedes-Benz GLC 300?

Top problems: ENGINE (29 complaints, avg repair $500); FUEL SYSTEM (11 complaints, avg repair $500); LIGHTING (10 complaints, avg repair $500). Issues typically appear around 50K miles.

Are there any recalls on the 2021 Mercedes-Benz GLC 300?

Yes, there are 7 recall(s): FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP, ELECTRICAL SYSTEM:SOFTWARE, ELECTRICAL SYSTEM:SOFTWARE, BACK OVER PREVENTION: SENSING SYSTEM: CAMERA, EXTERIOR LIGHTING:HEADLIGHTS, COMMUNICATION, AIR BAGS:SENSOR:SIDE IMPACT. Contact any Mercedes-Benz dealer to verify if recalls have been completed on your specific vehicle.

How much does it cost to fuel a 2021 Mercedes-Benz GLC 300?

The 2021 Mercedes-Benz GLC 300 gets 25 MPG combined. At current US average gas prices, driving 12,000 miles per year costs roughly $1920. See the interactive fuel cost calculator on this page for state-specific pricing.

How much does it cost to insure a 2021 Mercedes-Benz GLC 300?

Estimated US average full-coverage insurance for the 2021 Mercedes-Benz GLC 300 is approximately $2,373/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.

2021 Mercedes-Benz GLC 300

Problems, Recalls & Reliability Report

Average

Quick Summary

The 2021 Mercedes-Benz GLC 300 has 84 owner complaints filed with NHTSA — that's 1.0x the segment average of 84. The most common issue is engine problems (35% of all complaints), specifically: i have purchased the 2021 mercedes-benz glc 300 4matic coupe and noticed a design flaw on the car. as you can see in the attached picture, the front bumper provides no protection to the radiator. it has already started chipping due to the rock damage. this can leave the car impaired on the freeway w. There are 7 recalls issued for this model year. ⚠️ 1 fire report filed.

1 fire report 1 crash report

Total Complaints

Recalls Issued

—/5

Safety Stars

1.0x

vs Segment Avg

Known Problems(top 5 of 8)

ENGINE

29 complaints

35%

• I HAVE PURCHASED THE 2021 MERCEDES-BENZ GLC 300 4MATIC COUPE AND NOTICED A DESIGN FLAW ON THE CAR. AS YOU CAN SEE IN THE ATTACHED PICTURE, THE FRONT BUMPER PROVIDES NO PROTECTION TO THE RADIATOR. IT HAS ALREADY STARTED CHIPPING DUE TO THE ROCK DAMAGE. THIS CAN LEAVE THE CAR IMPAIRED ON THE FREEWAY W
• 2021 MERCEDES GLC. CONSUMER WRITES IN REGARDS TO VALVE SPRING FAILURE AND STALLED ENGINE. *LD THE CONSUMER STATED SHORTLY AFTER PURCHASING THE VEHICLE, THE VALVE SPRING BROKE CAUSING THE ENGINE TO FAIL WHILE DRIVING. THE FAILURE MILEAGE WAS 199. THE CONSUMER STATED THE ROADSIDE ASSISTANCE GROSSLY
• ON APRIL 21, 2021 AT ABOUT 1800 (TIME), LESS THAN 45-HOURS AFTER PURCHASE OF THE NEW 2021 GLC 300 VEHICLE, THE INTERNAL COMBUSTION (ENGINE) MISFIRED AND ABRUPTLY MALFUNCTIONED WHILE IN STEADY ACCELERATION AT 65-MPH. MY FAMILY AND I WERE HEADED EASTBOUND ON THE CA-60 FREEWAY IN LANE THREE (LEFTMOST,

Typical onset: 50K miles Est. repair: $500💥 1 crashes

“I HAVE PURCHASED THE 2021 MERCEDES-BENZ GLC 300 4MATIC COUPE AND NOTICED A DESIGN FLAW ON THE CAR. AS YOU CAN SEE IN THE ATTACHED PICTURE, THE FRONT BUMPER PROVIDES NO PROTECTION TO THE RADIATOR. IT HAS ALREADY STARTED CHIPPING DUE TO THE ROCK DAMAGE. THIS CAN LEAVE THE CAR IMPAIRED ON THE FREEWAY W”

— NHTSA complaint filing

When Problems Appear on the 2021 Mercedes-Benz GLC 300

Based on 15 owner complaints that included an odometer reading. Median mileage at time of complaint: 19K 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+

ENGINE

In line with typicalmedian 7K mi · 7 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 (7)

FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP26/06/2023

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021-2023 C-Class, E-Class, S-Class, CLS, SL, GT, GLC, GLE, GLS, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle details. The fuel pump may shutdown, which can result in a loss of drive power.

Risk: A loss of drive power can increase the risk of a crash.

Fix: Dealers will replace the fuel pump, free of charge. Owner notification letters were mailed on June 14, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2023070012.

Fuel Cost Calculator for 2021 Mercedes-Benz GLC 300

Live EIA prices

Annual miles driven: 12,000

Your state (affects local gasoline price)

Per year

$1,920

Per month

$160

Per mile

16.0¢

MPG

City driving (worst-case MPG)

$2,182/yr

Highway driving (best-case MPG)

$1,656/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 2021 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

$2,373

Full coverage / month

$198

Liability only / year

$732

vs US avg

+42%

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 age1.05x

= Full coverage estimate$2373

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 2021 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

FUEL SYSTEM(~50K mi)

$500

LIGHTING(~50K mi)

$500

ELECTRICAL(~50K mi)

$500

OTHER(~50K mi)

$500

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

🔍 Pre-Purchase Inspection Checklist

Based on 84 owner complaints for this specific year, here's what to check or ask about:

☐
ENGINE: I HAVE PURCHASED THE 2021 MERCEDES-BENZ GLC 300 4MATIC COUPE AND NOTICED A DESIGN FLAW ON THE CAR. AS YOU CAN SEE IN THE ATTACHED PICTURE, THE FRONT BUMPER PROVIDES NO PROTECTION TO THE RADIATOR. IT HAS ALREADY STARTED CHIPPING DUE TO THE ROCK DAMAGE. THIS CAN LEAVE THE CAR IMPAIRED ON THE FREEWAY W
Typically appears around 50K miles. Repair cost ~$500
☐
FUEL SYSTEM: ON APRIL 21, 2021 AT ABOUT 1800 (TIME), LESS THAN 45-HOURS AFTER PURCHASE OF THE NEW 2021 GLC 300 VEHICLE, THE INTERNAL COMBUSTION (ENGINE) MISFIRED AND ABRUPTLY MALFUNCTIONED WHILE IN STEADY ACCELERATION AT 65-MPH. MY FAMILY AND I WERE HEADED EASTBOUND ON THE CA-60 FREEWAY IN LANE THREE (LEFTMOST,
Typically appears around 50K miles. Repair cost ~$500
☐
LIGHTING: Vehicle left/front headlight has water condensation and entire headlight doesn't work. Its pretty much not drivable. I brought the vehicle to a manufacturer dealership and they claim that the failure of the headlight is due to physical impact to the exterior of head light. There is a minor scratch b
Typically appears around 50K miles. Repair cost ~$500
☐
ELECTRICAL: The contact owns a 2021 Mercedes-Benz GLC300. The contact received a recall notification for NHTSA Campaign number: 21V354000 (Back Over Prevention, Electrical System). The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was notif
Typically appears around 50K miles. Repair cost ~$500
☐
RECALLS: Verify all 7 recalls have been completed — free at any Mercedes-Benz dealer
☐
General: Get a pre-purchase inspection from an independent mechanic ($100-$200)