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Electrical systemPart report

2020 Mercedes-Benz GLC 300 Electrical system Problems

Complaints
6about this part
Share
9%of 70 total for the year
Median mileage
35,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 6 complaints about the electrical system of the 2020 Mercedes-Benz GLC 300, 9% of the 70 complaints for this model year. Where a mileage was given, the median is 35,000 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 October 23, 2026, my 2020 Mercedes-Benz GLC 300 unexpectedly lost engine power while I was in traffic, without advance warning. When I attempted to restart it, the engine started, shook, and shut off again. A 12-volt battery warning appeared during the incident. On October 26, a dealership representative told me a software issue caused the shutdown and that a software update was needed. They said the update would be performed at no charge, although I would owe a diagnostic fee. I am concerned that the vehicle could lose power without warning again, especially at highway speeds. …”

NHTSA complaint #11773769, filed 2026-10

“The contact's wife owns a 2020 Mercedes-Benz GLC300. The contact stated that while his wife was driving at an undisclosed speed, the vehicle stalled. The vehicle was towed to the dealer and diagnosed with ignition failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired and remained at the dealer. The manufacturer was made aware of the failure but declined to buy back the vehicle and offered a two-year service plan for a free oil change per year. The failure mileage was approximately 30,000.”

NHTSA complaint #11455199, filed 2022-03, 30,000 miles

“The contact owns a 2020 Mercedes-Benz GLC300. The contact stated that while operating the vehicle, the 12-Volt battery warning light remained illuminated. The contact stated that while driving at various speeds, the vehicle shut off. The failure also occurred while driving on a busy freeway. The vehicle was towed to the local dealer who diagnosed that the STOP/START button was faulty and needed to be replaced. The STOP/START button was replaced but the failure persisted. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was 40,000.”

NHTSA complaint #11558553, filed 2023-12, 40,000 miles

“Center COMAND screen malfunctions. No rear camera view when reversing when screen does not work. Dealer attempted a repair but issue remains. Parts ordered for replacement.”

NHTSA complaint #11581247, filed 2024-04

“The contact owns a 2020 Mercedes-Benz GLC300. The contact received notification of NHTSA Campaign Number: 21V354000 (Back Over Prevention, Electrical System) however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.”

NHTSA complaint #11491174, filed 2022-10

Related recalls

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
20251275%
2024629%
20233055%
20221220%
2021812%
202069%
20191430%
20181315%
20171515%
2016118%

Other parts of the 2020 Mercedes-Benz GLC 300

Engine
22 complaintsOther or unknown
15 complaintsBack-over prevention (rear camera)
7 complaintsForward collision avoidance
6 complaintsExterior lighting
5 complaintsSteering
5 complaintsFuel system
4 complaintsTransmission and drivetrain
4 complaintsBrakes
3 complaintsBody and structure
3 complaintsAir bags
2 complaintsVehicle speed control
2 complaints

← All problems reported for the 2020 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