Vehicle shut off on busy highway. Engine shut off. Electrical/ computer system malfuncitoned. Vehicle would not start back up again
2017 Mercedes-Benz GLC-Class electrical problems
severe Owners of the 2017 Mercedes-Benz GLC-Class have filed 17 NHTSA complaints about the electrical at roughly $850 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See electrical across all vehicles →
Complaints
17
Recalls
0
Avg fix
$850
| Model year | electrical complaints |
|---|---|
| 2016 GLC-Class | 12 |
| 2017 GLC-Class (this page) | 17 |
| 2018 GLC-Class | 14 |
| 2019 GLC-Class | 16 |
| 2020 GLC-Class | 10 |
2fires
When does it fail?
Of the 17 electrical complaints filed for the 2017 Mercedes-Benz GLC-Class, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Among the 7 model years of Mercedes-Benz GLC-Class in our records for electrical problems, this one ranks #2 by owner-complaint volume.
No new NHTSA electrical complaint has been filed on this vehicle in over 7 years — the issue may be aging out of the active population.
The failure pattern owners describe
Owners of this 2017 GLC-Class report a spectrum of electrical and drivetrain issues. The most severe complaints involve sudden loss of engine power at highway speeds and complete engine fires while driving at low speed, both traced to electrical system malfunctions. Two owners experienced the vehicle unexpectedly rolling backward after selecting Park, indicating a transmission electrical control failure. Loss of keyless entry function trapped an owner and child in the vehicle. A pattern emerges around NHTSA recall 17V114000 (electrical system, engine and cooling): multiple owners received recall notices but dealers could not obtain repair parts for extended periods, leaving vehicles unrepaired despite safety implications. Battery and alternator failures caused loss of motive power on at least one vehicle. Crankcase ventilation system failures triggered check engine lights and gasoline odors in the cabin. One owner reports water intrusion through the sunroof and trunk seals causing mold and interior damage, with the dealer claiming wear and tear and quoting $15,000 in repairs. Collision prevention assist warning messages and a vehicle shutdown on a busy highway round out the complaints. Some narratives also mention unrelated concerns like odometer discrepancies and transmission fluid issues, though these fall outside core electrical failure.
Same Mercedes-Benz GLC-Class electrical reports on nearby years: 2016 · 2018 · 2019 · 2020
Failure modes owners describe
Engine Fire / Catastrophic Electrical Ignition
Engine caught fire while vehicle was in motion at low speed. Owner reported burning smell and fumes from AC vents. Authorized dealer called it a catastrophic event. Engine was replaced under warranty.
When: While driving under 30 mph on a purchased vehicle from October 2016
Symptoms owners cite: burning smell; fumes from AC vents; visible flames and smoke; vehicle loss of power to open doors
Repairs/costs cited: Engine replacement performed under warranty
Recalls/TSBs owners mention: Manufacturer agreed to engine replacement under warranty
Sudden Loss of Motive Power / Engine Stall
Engine shut down without warning while driving at highway speed, leaving vehicle unable to restart. No warning lights illuminated in one case; electrical/computer system malfunction reported in another.
When: At undisclosed mileage/speed; one case on busy highway
Symptoms owners cite: complete loss of engine power; vehicle unable to restart immediately; no warning lights in one case
Sunroof Water Intrusion and Seal Failure
Water leaked into cabin and trunk from sunroof and trunk seals despite sunroof being closed. Mold developed on seats, seatbelts, and trunk contents. Dealership attributed to wear and tear and quoted $15,000 for complete repair.
When: Within one year of daughter's ownership; owner drove vehicle for approximately 1 year afterward and rarely opened sunroof
Symptoms owners cite: water dripping from sunroof area; wet trunk and back seats; mold spots on seatbelt and back of seat
Repairs/costs cited: $500 for water test, $736 for seal replacement; dealership quoted $15,000 total for complete repair
Battery/Alternator Failure with Loss of Power
Vehicle lost motive power while driving. Initial dealer diagnosis indicated battery failure; repair did not resolve issue. Second visit diagnosed alternator failure, which was replaced.
When: Failure mileage unknown
Symptoms owners cite: sudden loss of motive power while driving; vehicle able to be restarted after pulling over
Repairs/costs cited: Battery and alternator replaced at dealer
Keyless Entry Lockout
Keyless entry system locked driver and passenger inside vehicle with keys in the car while parked. Occurred in high-crime area at night with wife and 7-year-old child present. Owner reports other GLC300 owners experiencing the same issue.
When: Late night while vehicle parked
Symptoms owners cite: unable to unlock doors; keys locked inside vehicle
Repairs/costs cited: Mercedes roadside assistance charged $99.95 to unlock vehicle
Transmission Electrical Control Failure (Park Malfunction)
Transmission did not engage Park when button was pressed. Vehicle rolled backward when driver released brake pedal. Wife noticed motion and alerted driver to brake, preventing collision.
When: Unknown mileage
Symptoms owners cite: Park button press did not engage Park; vehicle rolled backward with brake released
Vehicle Shifts Into Neutral While Driving
Vehicle unexpectedly shifts into neutral while in motion, creating safety risk on roadway.
When: Unknown mileage/timing
Symptoms owners cite: transmission shifts to neutral while driving
Recall 17V114000 Parts Unavailability
Multiple owners received NHTSA recall notification 17V114000 (electrical system, engine and cooling) but dealers could not obtain repair parts for extended periods. Manufacturer stated parts were unavailable with no specific timeframe for arrival. No actual failures were reported by these owners, but vehicles remained unrepaired.
When: Recall notifications received March 2017 onward; parts still unavailable months later
Symptoms owners cite: no reported failure; recall notification received
Codes mentioned: 17V114000
Recalls/TSBs owners mention: Recall 17V114000 issued; manufacturer stated parts unavailable and vehicles safe to use; remedy parts not available at time of complaints
Crankcase Ventilation System Failure
Crankcase ventilation system not working properly, causing engine to lack proper ventilation. Check engine light illuminated. Owner reports overwhelming gasoline smell in interior and characterizes as common problem on GLC300.
When: Unknown mileage
Symptoms owners cite: check engine light; overwhelming gasoline smell in cabin
Repairs/costs cited: Dealership diagnostic cost $250
Collision Prevention Assist System Malfunction
Error message displayed indicating collision prevention assist system is inoperable.
When: Unknown mileage/timing
Symptoms owners cite: collision prevention assist inoperable error message
Repairs/costs cited: Dealership quoted $400 for diagnostic only
Synthesized from 17 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Vehicle key-less entry locked out the driver and passenger with keys inside the vehicle while parked. Talked to other Mercedes glc300 owners and they are experiencing same issue. This happened late at night with my wife and 7 year old daughter in a high crime area while I was out of town. Mercedes roadside assistance charged us $99.95 to unlock vehicle. This is a life threatening defect and…
Had electrical trouble with your 2017 Mercedes-Benz GLC-Class?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2017 Mercedes-Benz GLC-Class?
It's a meaningful issue. 17 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Based on the 17 complaints filed, electrical issues most often appear around 33,160 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2017/Mercedes-Benz/GLC-Class.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.