Takata recall seatbelt issues warranty items /electrical no response from dealer after repeated emails
2017 Mercedes-Benz C-Class electrical problems
severe Owners of the 2017 Mercedes-Benz C-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 |
|---|---|
| 2013 C-Class | 21 |
| 2014 C-Class | 11 |
| 2015 C-Class | 47 |
| 2016 C-Class | 28 |
| 2017 C-Class (this page) | 26 |
| 2018 C-Class | 12 |
| 2019 C-Class | 12 |
| 2020 C-Class | 3 |
1crash
1fire
What stands out
Owners have filed 26 electrical complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
No new NHTSA electrical complaint has been filed on this vehicle in over 8 years — the issue may be aging out of the active population.
The failure pattern owners describe
The 2017 C-Class shows a pattern of serious electrical failures. Two owners experienced complete power loss while driving on busy roads—first incident blamed on loose battery terminal connection at the dealership, second incident occurred 11 days later on the same vehicle. Both episodes left the car stranded, requiring police intervention and 45–60 minutes to remove from traffic. A separate incident involved catastrophic engine-compartment fire while parked, caused by electrical failure; the vehicle was totaled. Another owner reported loss of power on the interstate following improper shop repairs that included loose fuel pump, unsecured fuel line, and missing bolts.
Beyond outright failures, owners report exterior light wiring melting inside assemblies, panoramic sunroof sticking or opening halfway, steering wheel clock spring snapping with airbag light illumination, and key-detection failures at startup requiring multiple attempts to start. One vehicle exhibited push-to-start vibration at just 40 miles.
A significant complaint cluster centers on unresolved electrical fault codes (U0121, U1110, U0122, U0423, B227d) that persist despite owners having recall notices but unable to complete repairs—Campaign 17V114000 and 21V058000 parts have remained unavailable for months with no clear delivery date from the manufacturer. Owners also report PCV valve fault codes (P052E) with repair estimates exceeding $2,000, fuel hose leaks, collision-prevention system failures, and multiple comfort-feature malfunctions (convertible top, mirrors, steering wheel adjust, Bluetooth pairing).
Same Mercedes-Benz C-Class electrical reports on nearby years: 2014 · 2015 · 2016 · 2018 · 2019
Failure modes owners describe
Complete Loss of Electrical Power While Driving
Vehicle loses all electrical power while in motion, causing complete immobility with no warning lights, power steering, or brakes available. Poses serious safety hazard in traffic.
When: One complaint at 5 PM in traffic; second incident 11 days later. Another complaint cites loss of power on interstate following shop repairs.
Symptoms owners cite: Complete loss of all electrical power; Vehicle immobile on roadway; No warning indicators before failure; Loss of power steering and brakes; Strong fuel odor reported in one case
Repairs/costs cited: First complaint: Mercedes dealership identified loose positive battery terminal connection after 5-day inspection. Second complaint (post-shop repair): Multiple safety defects identified including loose fuel pump, unsecured fuel line, missing bolts, improperly reassembled engine components.
Engine Compartment Fire
Vehicle caught fire while parked. Fire department determined cause was electrical failures. Vehicle totaled; interior completely burned.
When: Approximately 53,000 miles
Symptoms owners cite: Vehicle caught fire while parked; Console area caught on fire; Complete interior burned
Repairs/costs cited: Fuse line underneath front passenger seat had failed approximately 2 months prior and was replaced at dealership.
Recalls/TSBs owners mention: NHTSA Campaign 17V114000 (Electrical System, Engine and Engine Cooling). Dealer informed contact vehicle was not included in this campaign, though case was opened by manufacturer.
Exterior Light Wiring Melting and Bulb Failure
Wires to exterior light fixtures melt; exterior light bulbs melt into sockets. Entire light assembly must be replaced.
When: Spring 2013, Spring 2016, November 2017 (three separate occurrences on three different light assemblies)
Symptoms owners cite: Exterior light wires melting; Light bulbs melting into sockets; Multiple light assemblies affected
Repairs/costs cited: Entire light assembly replacement required; occurred three times on different light fixtures.
Sunroof Malfunction
Panoramic sunroof exhibits intermittent operation: opens halfway, fails to open or close, or operates unevenly (one side up, other side closed). Owner reports this is common issue across Mercedes panoramic sunroofs.
Symptoms owners cite: Sunroof opens partway with one side up and other side closed; Sunroof opens fully but will not close; Sunroof will not open at all; Intermittent/glitchy operation
Steering Wheel Clock Spring Failure
Clock spring behind steering wheel snaps, triggering airbag warning light with risk of inadvertent airbag deployment.
When: Reported during reversing maneuver
Symptoms owners cite: Steering wheel clock spring snaps; Airbag warning light illuminates; Risk of unintended airbag deployment
Push-to-Start Abnormal Vibration
Vehicle vibrates abnormally when started via push-to-start feature. Dealer stated vehicle performed as intended.
When: Approximately 40 miles on odometer
Symptoms owners cite: Abnormal vibration when starting vehicle
Repairs/costs cited: Vehicle not repaired; dealer stated performance was normal.
Recalls/TSBs owners mention: Vehicle included in NHTSA Campaign 17V114000 (Electrical System, Engine and Engine Cooling).
Key Detection/Start Failure
Vehicle fails to recognize key on startup; display shows key not detected. Requires multiple exit/re-entry attempts before vehicle starts.
When: One complaint at 1 year of ownership (April 2018); another complaint with multiple unrelated electrical issues.
Symptoms owners cite: Key not detected display message; Vehicle will not start on first attempt; Requires multiple key cycles before starting
Fuel Hose Leakage
Fuel hose leaks, creating fuel odor. Occurs when vehicle started via mobile app but not during manual start.
When: Approximately 55,000 miles
Symptoms owners cite: Fuel odor from vehicle; Fuel hose leaking
Repairs/costs cited: Fuel hose replacement required.
PCV Valve Fault Codes and Engine Check Light
Check engine light illuminates for PCV (Positive Crankcase Ventilation) valve error codes (P052E). One owner reports repair cost exceeds $2,000.
When: Occurred with no recent changes or driving issues reported
Symptoms owners cite: Check engine light illumination; P052E fault code (PCV Regulator Valve Performance); Vehicle driving normally otherwise
Codes mentioned: P052E
Repairs/costs cited: Repair estimated at over $2,000.
Multiple Unresolved Electrical System Codes
Vehicle displays multiple electrical fault codes not corresponding to active recalls listed on manufacturer website or NHTSA site for that specific VIN. Codes persist despite recall notices.
Symptoms owners cite: Multiple electrical fault codes present; Codes not matching listed recalls; Discrepancy between vehicle codes and NHTSA/MB websites
Codes mentioned: U0121, U1110, U0122, B227d, U0423
Recalls/TSBs owners mention: NHTSA Campaign 17V114000 (Electrical System, Engine and Engine Cooling); Campaign 21V058000 (Communication, Electrical System). Owners report codes not resolved despite recall campaigns.
Collision Prevention Assist Inoperative
Collision prevention assist system warning light comes on and system becomes inoperable without vehicle being in any collision.
Symptoms owners cite: Collision prevention assist warning light illuminated; System becomes inoperable without cause
Horn Nonfunctional When Ignition Off
Vehicle horn will not function when ignition switch is in off position.
Symptoms owners cite: Horn non-functional with ignition off
Convertible Top Malfunction
Power convertible top exhibits multiple issues: fails to operate, stays open and cannot close, requires multiple commands before responding.
When: One complaint reports top replaced after couple months of ownership; another at 1 year of ownership.
Symptoms owners cite: Top will not open; Top will not close when open; Top fails to respond to commands; Requires multiple activation attempts
Repairs/costs cited: Top replaced under warranty after couple months of ownership in one case.
Power Mirror Malfunction
Mirrors fail to fold when commanded.
When: Multiple occurrences within first year of ownership
Symptoms owners cite: Mirrors will not fold
Steering Wheel Adjustment Failure
Steering wheel fails to adjust via power controls.
When: Within first year of ownership
Symptoms owners cite: Steering wheel will not adjust
Bluetooth/Phone Connectivity Issues
Vehicle cannot establish connection with owner's cell phone via Bluetooth.
When: Within first year of ownership
Symptoms owners cite: Unable to connect cell phone to vehicle infotainment system
Recall Parts Unavailability — Campaign 17V114000
Multiple owners received recall notices for NHTSA Campaign 17V114000 (Electrical System, Engine and Engine Cooling) but required parts remain unavailable for extended periods, delaying repairs indefinitely.
When: Recall notifications received; parts unavailable for months, with some dealers unable to provide availability estimates.
Symptoms owners cite: Recall notice issued but parts unavailable; Extended wait times for repair parts; No clear timeline provided by manufacturer or dealers
Repairs/costs cited: Multiple complaints state parts were unavailable as of mid-2017 with no availability estimate; one complaint mentions parts expected October 2017.
Recalls/TSBs owners mention: NHTSA Campaign 17V114000 (Electrical System, Engine and Engine Cooling). Manufacturer stated vehicle was safe to drive despite recall not being completable.
Recall Parts Unavailability — Campaign 21V058000
Owner received recall notice for Campaign 21V058000 (Communication, Electrical System) but parts unavailable for repair. Manufacturer exceeded reasonable timeframe for recall remedy.
When: Recall notification received; parts unavailable at time of complaint
Symptoms owners cite: Recall notice issued but required parts unavailable
Recalls/TSBs owners mention: NHTSA Campaign 21V058000 (Communication, Electrical System). Parts unavailable.
Synthesized from 26 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Had electrical trouble with your 2017 Mercedes-Benz C-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 C-Class?
It's a meaningful issue. 26 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 26 complaints filed, electrical issues most often appear around 36,800 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/C-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.