AI Damage2020 Mercedes-Benz EQC 400: common problems
The maker issued 44 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 44
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 0 | 0 | 13 |
| Equipment | 0 | 0 | 7 |
| Exterior lighting | 0 | 0 | 7 |
| Structure | 0 | 0 | 5 |
| Powertrain | 0 | 0 | 4 |
| Steering | 0 | 0 | 4 |
| Engine and cooling | 0 | 0 | 3 |
| Visibility | 0 | 0 | 3 |
| Seats | 0 | 0 | 2 |
| Backover prevention | 0 | 0 | 1 |
| Electronic stability control | 0 | 0 | 1 |
| Engine | 0 | 0 | 1 |
| Lane departure | 0 | 0 | 1 |
| Latches, locks, linkages | 0 | 0 | 1 |
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the…
Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once when changing from forward to reverse (and vice versa). Note: Sound file in…
- Complaint Headlamps leaking or fogged Cause The fogging of the headlamp is a natural phenomenon which can…
Complaint Headlamps leaking or fogged Cause The fogging of the headlamp is a natural phenomenon which can occur under certain climatic conditions. In contrast to a leaky headlamp, physical fogging does not result in a…
- Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon,…
Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the…
- Complaint MBUX head unit display with red text box "System Inoperative"
ONLY for vehicles with SA code (549+21U) or (549+U19). Cause Head unit software variant. Remedy For all chassis use Xentry to update head unit (A26/17). Target boot software number should be either: • 247 904 6600…
- Complaint MBUX headunit display with red text box "System Inoperative"
ONLY for vehicles with SA code (549+21U) or (549+U19). Cause Under analysis. Remedy For chassis 118, 167, 177, 213, 238, 243, 247, 253, and 293 use Xentry to update headunit (A26/17). Target software number is 247 904…
- Complaint During a phone call, the called party has difficulty understanding/cannot understand the driver,…
Complaint During a phone call, the called party has difficulty understanding/cannot understand the driver, or interference/background noises are audible to the called party during a call. It becomes increasingly…
- Complaint Tailgate opens unintentionally
Cause Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. E.g. when stored in trouser pocket, handbag etc. Remedy As of the 6th generation, the vehicle key can be recoded so that…
- Complaint The message "Device detected at diagnostics connection See Owner’s Manual" appears sporadically…
Complaint The message "Device detected at diagnostics connection See Owner’s Manual" appears sporadically in the multifunction display of the instrument cluster while driving (see picture in attachment). Cause On…
- Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the…
Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The noise is heard once in each instance when changing direction of travel. Note: Sound file in…
- Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the…
Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once when changing from forward to reverse (and vice versa). Cause If the…
- Complaint Fuel door may require several attempts to open
Please note that if the complaint "Fuel filler flap not opening" occurs, it is important to check the fuel filler flap before replacing the central locking actuator. For gasoline hybrid vehicles where the fuel filler…
- Complaint Paint damage on door paneling in area of door handle (see picture 1)
Cause Alignment of door handle bearing bracket is not correct. Remedy 1. Paint the affected area of the door paneling using the spot repair procedure in accordance with the manufacturer's specifications. 2. Replace the…
NHTSA lists 44 bulletins for this year; the 12 newest are shown here.
Questions and answers
What are the most common problems with the 2020 Mercedes-Benz EQC 400?
There are no owner complaints in the NHTSA data for this year; the data comes from 44 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2020 Mercedes-Benz EQC 400?
NHTSA lists 44 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2020 Mercedes-Benz EQC 400 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2020 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-06.