check engine light continues to turn on and off, response from dealer maintenance is this issue is temperature related and just keep driving, not sure how this makes for an effective or safe functioning of a warning light also seems like it can lead to unnecessary trips to and costs at the maintenance garage. This has been a multiple time issue since purchase of vehicle.
2023 Mercedes-Benz GLC-Class electrical problems
moderate Owners of the 2023 Mercedes-Benz GLC-Class have filed 26 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
26
Recalls
0
Avg fix
$850
| Model year | electrical complaints |
|---|---|
| 2019 GLC-Class | 16 |
| 2020 GLC-Class | 10 |
| 2022 GLC-Class | 8 |
| 2023 GLC-Class (this page) | 26 |
1crash
What stands out
Of the 7 model years of Mercedes-Benz GLC-Class we track for electrical problems, this one carries the most owner complaints on file — 26.
Electrical accounts for 41% of every owner complaint on file for this vehicle — the dominant problem area across 6 categories tracked.
The failure pattern owners describe
Owners of 2023 Mercedes-Benz GLC-Class vehicles report pervasive electrical faults across multiple systems, starting within days of delivery. The most common complaint is 12V battery warnings appearing despite recent charging or normal driving—some vehicles require boost jumping, extended restart waits of 1–2 hours, or won't start at all. One owner was stranded 8 times in the first few months.
A second major pattern involves 48V hybrid system failures, including engine shutdown while driving at highway speed with inability to restart. One owner's vehicle shut off at 40 mph; another at 75 mph. Dealers claim system updates occur mid-drive or report no fault codes despite clear symptoms.
False collision avoidance activation is reported by multiple owners: automatic emergency braking engages with no vehicles nearby, causing violent deceleration, seatbelt locking, and whiplash injuries. One owner eventually sold the vehicle back to the dealer due to safety concerns.
Additional failures include complete electrical blackouts with all warning lights and alarms activating simultaneously, making vehicles undrivable; instrument clusters going black while driving; and cameras, sunroofs, and digital headlights malfunctioning. One vehicle couldn't shift to park or lock its doors during a full electrical failure. Recall 24V115000 addresses faulty 80A fuses in the main fuse box, though one owner reports not being notified of the recall. Dealers frequently report finding no fault codes despite obvious symptoms, leaving owners without repairs or explanations.
Same Mercedes-Benz GLC-Class electrical reports on nearby years: 2020
Failure modes owners describe
12V Battery System Faults
Multiple owners report 12V battery low warnings appearing despite recent charging or normal driving. Some vehicles display critical voltage errors through the mobile app, fail to start, or require extended restart attempts (up to 1-2 hours). Jump starting sometimes required. Battery replacements performed by dealers have not consistently resolved the issue.
When: As early as 500 miles; repeatedly throughout ownership; one owner had 8 stranding events over time
Symptoms owners cite: Critical voltage error messages on app after vehicle turned off; Check engine light accompanying battery warnings; Vehicle will not start or start after long wait; Battery low warnings persist after charging overnight; Multiple restart attempts needed
Codes mentioned: 12V battery service required, Battery low
Repairs/costs cited: Battery recharged at front terminals; battery replacement performed by dealers (one replaced in 2024) without fully resolving issue
Recalls/TSBs owners mention: One owner reports MB initiated purchase buyback application; some dealers performed software updates; one recall mentioned related to 80A fuses affecting electrical systems
48V Hybrid Electrical System Faults
Owners report 48V battery service messages, engine shutdown while driving, and inability to restart. One owner's engine shut off at 40+ mph on a road; another experienced system requiring recharge during highway driving at 75 mph. Dealers attribute some failures to system updates occurring while vehicle is in motion or indicate no fault codes present despite symptoms.
When: As early as 2,400 miles; recurring throughout ownership
Symptoms owners cite: 48V battery service required messages; Engine shut off while driving at highway speed; Vehicle will not restart after shutdown; Reduced functionality warnings; Check engine light accompanied by 48V warnings
Codes mentioned: 48V battery service required, System update indicated by dealer
Repairs/costs cited: One dealer claimed system update occurred while driving; no repairs documented as successful; one owner states dealer could find nothing wrong despite symptoms
Recalls/TSBs owners mention: Consumer petition requesting focused review of ISG 48-volt system and recall expansion for 2023 GLC; issue reported as common across forums
Check Engine Light False or Undiagnosed Warnings
Check engine light comes on repeatedly with no confirmed fault. Dealers report no problem found, temperature-related warnings that disappear after driving, or excessive engine temperature warnings despite cold engine startup. Light sometimes extinguishes on its own. One owner reports light associated with 48V mild hybrid issues that dealers cannot reset after multiple visits.
When: Within 1,000 miles of ownership; recurring at 2-month intervals or more frequently
Symptoms owners cite: Check engine light illumination; Excessive engine temperature warning while engine is cold; Warning persists for hours to days then clears; No apparent cause identified by dealer diagnostic scan
Codes mentioned: Check engine light, Excessive engine temperature
Repairs/costs cited: Dealer diagnostic scan finds no problems; dealer recommends ignoring warning and returning only if it recurs; owners report ongoing issue despite dealer visits
Collision Avoidance System False Activation
Automatic emergency braking engages without nearby vehicles, obstacles, or pedestrians. One owner reports false collision detection near an empty school zone resulted in full brake engagement and seatbelt locking at 40 mph; another reports violent sudden deceleration on highway when truck merely entered merge lane at reduced speed, causing whiplash symptoms to both occupants. No fault codes found by dealers despite incidents.
When: One incident in July 2024 (~15 months into ownership at 6,177 miles); another in August 2024; multiple owners report false activations
Symptoms owners cite: Unexpected automatic emergency braking and deceleration to 10 mph; Audible beeping alerts; Seatbelts lock suddenly; Vehicle forced to reduce speed without driver input; No warning prior to activation
Repairs/costs cited: One dealer attributed response to proximity to school zone; another service manager indicated no fault codes present; one vehicle sold back to dealership due to safety concerns
Complete Electrical System Failures with Multiple Warning Lights
Vehicle experiences sudden activation of all warning lights, alarms, and sensors simultaneously—check engine, 12V system, braking, emergency braking, SOS, traction control, blind spot, digital light warnings all illuminated at once. Vehicle may not start, lock, shift to neutral, or allow normal operation. Conditions clear only after extended periods or boost charging. One owner at 5,400 miles couldn't start vehicle after 30-minute parking period.
When: At 5,400 miles (after 30-min park); at 2,400 miles; within 3 months of ownership; early in vehicle life
Symptoms owners cite: All warning lights, sensors, and alarms activate simultaneously; Loud alarms that cannot be silenced; Vehicle believes it is on when off; Unable to start engine or engage neutral; MercedesME Connect app sends critical messages; Cannot lock vehicle doors; Restarting only clears after extended wait or boost
Codes mentioned: Check engine, 12V electrical system warning, Braking system warning, Emergency braking warning, SOS warning, Traction control inoperative, Blind spot inoperative, Digital light inoperative
Repairs/costs cited: Boost charging required to restart; one vehicle attempted jump start at front terminals without initial success; extended charging overnight did not resolve persistent check engine light
Recalls/TSBs owners mention: MB online advisors requested dealer inspection; one owner reports dealers say issue is common across forums for 2023 model; one dealership had wait list for service appointments
Instrument Cluster and Display Blackout
Instrument cluster goes completely black or all screens turn off while vehicle is in drive and in motion, disabling all safety feature displays and readouts. Owner lost visibility to all onboard systems while driving.
When: At less than 500 miles on vehicle
Symptoms owners cite: All screens/cluster turn off while vehicle in drive and moving; Loss of all safety feature visibility; No warning before occurrence
Repairs/costs cited: Service could not duplicate failure; occurred one time
Failure to Start with No Clear Cause
Vehicle will not start or starts only after extended wait (10–15 minutes to several hours). Owners cycle through error messages or attempt restarts multiple times. One vehicle would not start fewer than 10 miles on the odometer. Issue sometimes resolved by software update, but recurs.
When: As early as delivery (fewer than 10 miles); within first month; multiple incidents throughout ownership
Symptoms owners cite: Vehicle completely unresponsive to ignition attempt; All error messages displayed on screen; Requires waiting 10–15 minutes or longer before retry; Eventually starts after multiple attempts
Repairs/costs cited: Software update performed by service; issue resolved briefly after update but recurred
Main Fuse Box / Electrical Component Failures
Main fuse box fails due to defective 80A fuses that may not meet production requirements. Recall 24V115000 issued for this defect. Contact interruption or increased triggering resistance results in connected systems becoming inoperative. Risk includes propulsion loss without warning, impaired restraint functions, instrument cluster failure, and fire risk.
When: Timing not specified by owners; defect present from manufacture
Symptoms owners cite: Multiple systems unexpectedly inoperative; Propulsion loss possible; Restraint system impairment possible; Instrument cluster may fail; Fire risk noted
Repairs/costs cited: Main fuse box replacement required per recall 24V115000; one vehicle experienced crash while parked due to instrument cluster failure related to electrical issues
Recalls/TSBs owners mention: Recall 24V115000 issued; authorized Mercedes dealers to replace main fuse box; one owner reports dealer did not notify them of recall despite being issued
Digital Light and High Beam Assist Malfunction
Digital adaptive headlights fail or operate erratically. High beam assist becomes inoperative. Wheel level sensors read incorrectly (value of 8149 when normal range differs), causing digital light and high beam assist to disable. Jagged or uneven light output; lights do not illuminate roadway as designed. Blind spot monitor display intermittent and barely visible.
When: Occurring at various mileages including within first 5,000 miles
Symptoms owners cite: Digital light inoperative warning; High beam assist inoperative; Heads-up display may flash red with incorrect messages; Adaptive lighting malfunction; Wheel level sensor fault; Blind spot monitor display intermittent; Jagged light beam output
Codes mentioned: Digital Light Inoperative, High Beam Assist inoperative, Fault C151E29, Wheel level sensor fault
Repairs/costs cited: Wheel level sensor unplugged and reseated; ordered new wheel level sensor replacement; headlight assembly may require service
Sunroof Failure
Panoramic sunroof will not close after software update. One owner had to return vehicle the next day for repair after update. Another reports panoramic roof malfunction without specified symptom. One owner reports roof will not close and also water sloshing sound in vehicle with no rainfall reported.
When: After software update performed by service; also reported independently
Symptoms owners cite: Sunroof/panoramic roof will not close; Water sloshing sound in unknown area of vehicle
Repairs/costs cited: Sunroof malfunction duplicated by service and repaired
Camera and Visibility System Failure
Rear camera system displays error message 'System Inoperative.' Owner states this makes them distrust all electronic components and safety features. Failure occurred at approximately 1,350 miles.
When: At approximately 1,350 miles
Symptoms owners cite: Error message 'System inoperative' displayed for camera/visibility system
Codes mentioned: System inoperative
Repairs/costs cited: Vehicle in service; status of duplication/repair unclear at time of complaint
Trunk Lid Automatic Closure Malfunction
Trunk door independently lowers and strikes occupants on head. Failure occurs frequently. Automatic open and close feature cannot be disengaged per dealer. One incident struck owner's wife on head; owner concerned due to previous concussion history.
When: At approximately 10,000 miles; occurring frequently
Symptoms owners cite: Trunk door independently lowers without user input; Strikes occupants; Cannot be disabled by user
Repairs/costs cited: Cause not yet determined by dealer; vehicle not repaired
Recalls/TSBs owners mention: Manufacturer made aware and opened a case
Brake System and Parking Brake Failures
Brake pedal failure during parking maneuver; brake warning light illuminated before instrument cluster black out. Parking brake cannot hold vehicle in park position. Vehicle unable to be shifted into park after malfunction.
When: At approximately 7,000 miles; within first months of ownership
Symptoms owners cite: Brake pedal fails during low-speed parking; Instrument cluster goes black; Parking brake does not engage or hold; Vehicle cannot shift into park; Door alarm for transmission not in park sounds continuously
Codes mentioned: Transmission error: do not shift into gear
Repairs/costs cited: Vehicle not diagnosed by dealer or mechanic; frontal damage to vehicle from resulting crash into building wall; hood, headlights, bumper damaged; windshield cracked; airbags did not deploy
Speed Limit Warning System Malfunction
Speed limit warning system displays false warnings. While driving at 60 mph, heads-up display illuminates red light and shows message about driving too slowly. Red light flashes intermittently. Dealer confirms issue is common but cannot repair. Cannot be deactivated without manufacturer approval.
When: At approximately 12,000 miles
Symptoms owners cite: HUD displays red light and incorrect speed warning; Red light flashes intermittently; False message that driver is going too slowly
Repairs/costs cited: Not repaired; dealer and manufacturer offered no assistance
Recalls/TSBs owners mention: Dealer informed manufacturer; offered no assistance; deactivation requires manufacturer approval
Theft Deterrent Alarm False Activation
Theft deterrent alarm sounds in middle of night without provocation or user input. One owner reports this occurring after collision assist malfunction repairs.
When: Recurring without specific timing provided
Symptoms owners cite: Alarm sounds at night without cause; No security breach or theft occurring
Rear Tail Light Assembly Defect
Rear left tail light assembly defective. Parking light stays on after vehicle is turned off; intermittently turns off. Light assembly was replaced by dealership but failed again less than a year after replacement.
When: Occurring twice on same vehicle; second failure less than one year after first replacement
Symptoms owners cite: Rear left tail light not working properly; Parking light remains on after ignition off; Light assembly failure repeating
Repairs/costs cited: Light assembly replaced by dealership; assembly proved defective and failed again
Synthesized from 26 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 8 most recent
GLC 300 was purchased new on May 25, 2023. Multiple 12V battery errors, check engine indicators, and rear hatch closing on owner starting the first week of ownership. 48V battery and Main Fuse Box were replaced. Multiple recalls were addressed. Most significant issue related to false collision avoidance incidents on two occasions that resulted in dangerous situations and extreme stress on the…
2023 Mercedes Benz GLC 300. Several Electrical, Braking, Collision, Check Battery related issues noted. At approximately 500 miles on vehicle battery system began sending critical voltage error messages to notification app after the vehicle had been turned off. --Owner recharged battery on front terminals. At various intervals, check engine light would come on while driving, sometimes for…
The care sends a message that the battery is low. Then the check engine light comes on till we drive the car for awhile. The first time this happened I took it to the dealer and they said they could find nothing wrong with it and was giving no readings. It has continued to happen a lot. The battery should not be going down if it not being used. There has to be a problem. This has been going…
The contact owns a 2023 Mercedes-Benz GLC300. The contact stated while attempting to start the vehicle, the message "12 Volt Battery Failure, Vehicle Inoperative" was displayed. Later, the contact was able to start the vehicle, but the check engine warning light remained illuminated. Eventually the light shut off and the vehicle operated normally. The vehicle was taken to the local dealer who…
Car would not start warning lights on dash unable to start car
Hatch closes or opens when bumper cover is depressed accidentally causing injuries by smashing on top of head and crushing hands. Contact us for a video recording of an event.
Second time the rear left tail light not working properly. The parking light stay on after turning vehicle off at time it turns off. The light assembly was replaced by dealership less than a year ago. The light assembly was defective according to the dealership vehicle was purchase 10 prior.
Had electrical trouble with your 2023 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 2023 Mercedes-Benz GLC-Class?
It's a documented issue but not catastrophic. 26 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Based on the 26 complaints filed, electrical issues most often appear around 9,667 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/2023/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.