2017 Mercedes-Benz C 300 electrical system problems
31 owner complaints filed with NHTSA name the electrical system on the 2017 Mercedes-Benz C 300 — 14% of all complaints for this model year.
What owners report
“The contact owns a 2017 Mercedes-Benz C300. While driving at approximately 15 mph, the contact observed smoke emanating from under the hood. The vehicle was driven to her work location and parked. Upon exiting the vehicle and opening the hood, she observed orange flames coming from the engine…”
filed May 15, 2026
“I am reporting a serious vehicle safety hazard caused by improper and unsafe repair work performed by USA Platinum Motor, located at 1221 California Lane #126B, Arlington, TX. I brought my 2017 Mercedes-Benz C300 in for a cold start rattle with no warning lights or prior issues. The shop diagnosed…”
filed Oct 30, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- Please refer to MBUSA's recall report for specific vehicle model detailsCampaign 22V365000 · May 20, 2022
Related service bulletins
Complaint Service code B1 displayed in the customer menu does not match the workshop code displayed in the workshop menu, e.g., 505 or 550A, which includes a service A. Cause The root cause is currently being…
LI00.20-P-080703 · Service Bulletin/Repair Instructions · issued Jun 12, 2026Complaint After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the message "SOS - service not activated" appears on the instrument cluster. In addition, the following two…
LI82.85-P-080507 · Service Bulletin/Repair Instructions · issued May 26, 2026Complaint The customer requests deactivation of the N112/9 HERMES communication module Note: Deactivation of the HERMES control unit (N112/9) is not supported for gray-market vehicles. Cause Before deactivating the…
LI82.85-P-080559 · Service Bulletin/Repair Instructions · issued May 26, 2026Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause…
LI54.65-P-080132 · Service Bulletin/Repair Instructions · issued May 12, 2026
Electrical System problems in other C 300 years
| Year | Reports | Share |
|---|---|---|
| 2023 C 300 | 5 | 23% |
| 2022 C 300 | 7 | 28% |
| 2020 C 300 | 4 | 12% |
| 2019 C 300 | 11 | 17% |
| 2018 C 300 | 10 | 10% |
Other reported problem areas on the 2017 Mercedes-Benz C 300
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.