2021 Mercedes-Benz GLC 300 Fuel system Problems
- Complaints
- 12about this part
- Share
- 18%of 67 total for the year
- Median mileage
- 9,730miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 12 complaints about the fuel system of the 2021 Mercedes-Benz GLC 300, 18% of the 67 complaints for this model year. Where a mileage was given, the median is 9,730 miles. 1 recall campaign on record is filed under a similar system.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“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, fastest lane). As soon as the engine spontaneously sputtered, it abruptly stopped and intensely shook the entire car vigorously, aggressively, and continuously with no ability for control nor for the option to continue to accelerate. …”
NHTSA complaint #11413885, filed 2021-04, 90 miles“This is the 3rd incidence of this issue (July, Oct, Dec), but we have been advised that a software update is not yet available from the manufacturer. In all instances, we were travelling at a normal rate of in-city traffic (30-45 mph) and all of sudden the vehicle will not accelerate above 25 mph regardless of the position of the throttle. My dealer, Mercedes Benz of Tampa, advises that the problem can only be corrected permanently with a software update which is not yet available. …”
NHTSA complaint #11559715, filed 2023-12“My car was bought new in October 2021 & I began having problems after having it for 6 months & the mileage at that time was about 4000 miles - it was in April 2022 & the check engine light came on & I had a loss of power to where it slowed down & would not go any faster than about 30/35 miles an hour going on a straight road way & no faster than about 10 miles an hour going uphill. The engine sounded funny as well. It had to be towed to the dealership for repair. This incident happened again a month later & it was towed to the dealership at that time. …”
NHTSA complaint #11486730, filed 2022-09“The vehicle is experiencing an intermittent, sudden, and life-threatening drop into limp home mode while driving, creating an severe speed differential with surrounding traffic.First Incident (50,584 miles): The vehicle entered limp mode. Authorized Mercedes service center scanned the car, confirming Fault Code P019185 (Rail pressure sensor malfunction / signal above permissible limit value). …”
NHTSA complaint #11760688, filed 2026-08“Entered parked vehicle and noticed very strong gas fumes. Vehicle would not start. Looked under the vehicle and noticed very large quantity of gasoline on the ground. Vehicle was towed to Mercedes dealership in Rochester, Michigan. Diagnosis was an incorrectly installed fuel line bracket. New bracket was installed and problem was corrected.”
NHTSA complaint #11421457, filed 2021-06Related recalls
- 23V445000Jun 26, 2023Mercedes-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…Covers: Mercedes-Benz GLC 300 2021–2023, C300 2021–2023, AMG G63 2021–2023 +37 more
Related service bulletins
- 11036999Aug 15, 2026Dear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA…
- 11035490Jul 31, 2026This NCU replaces the prior NCU issued on May 15, 2025, and contains additional MY 2023 and MY 2024 vehicles which are highlighted below.
- 11019016May 30, 2025In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA is extending the warranty…
- 11018625May 15, 2025In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA, LLC (“MBUSA”) is…
- 11014402Feb 21, 2025Complaint Customer-perceived problem: • Fuel gauge reading implausible • MIL ON (market-dependent) N118/3 Fault codes in control units FSCM_GEN4/5/6 • For these fault codes, the…
- 11013179Jan 24, 2025Complaint Customer-perceived problem: • Fuel gauge reading implausible • MIL ON (market-dependent) N118/3 Fault codes in control units FSCM_GEN4/5/6 • For these fault codes, the…
- 10205814Aug 11, 2021Fuel filler flap opens slowly/switch flashes/tank is bleeding instrument cluster warning
- 10199787Jul 30, 2021Launch EW NCU - Low Pressure Fuel Hose MY 15-17 205 213 253 172
Fuel system: other model years
Other parts of the 2021 Mercedes-Benz GLC 300
30 complaintsExterior lighting
13 complaintsElectrical system
8 complaintsOther or unknown
7 complaintsTransmission and drivetrain
4 complaintsVisibility (wipers, defrost, mirrors)
4 complaintsBack-over prevention (rear camera)
3 complaintsForward collision avoidance
3 complaintsBody and structure
3 complaintsLane departure
2 complaintsVehicle speed control
2 complaintsAir bags
1 complaints
← All problems reported for the 2021 Mercedes-Benz GLC 300
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Nov 1, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology