AI Damage2021 Mercedes-Benz EQC 400 E: common problems
The maker issued 24 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 24
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 0 | 0 | 6 |
| Exterior lighting | 0 | 0 | 5 |
| Powertrain | 0 | 0 | 3 |
| Steering | 0 | 0 | 3 |
| Engine and cooling | 0 | 0 | 2 |
| Seats | 0 | 0 | 2 |
| Structure | 0 | 0 | 2 |
| Electronic stability control | 0 | 0 | 1 |
| Equipment | 0 | 0 | 1 |
| Latches, locks, linkages | 0 | 0 | 1 |
| Service brakes | 0 | 0 | 1 |
| Visibility | 0 | 0 | 1 |
| Other | 0 | 0 | 2 |
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.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
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 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 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 Washer fluid system leaks Cause Various possible causes
1. Washer fluid reservoir itself. 2. Seal on washer fluid pump/washer fluid reservoir. 3. Washer fluid pump. 3.1. Distributor housing leaks. 3.2. Pump fitting leaks. 3.3. Washer fluid hose cannot be snapped into place…
- Complaint Headlamp or front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural…
Complaint Headlamp or 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 Rear lamps fogged up/not leaktight
Cause Fogging of the rear lamps is a natural phenomenon, which can occur under certain climatic conditions. This does not lead to any technical impairment of the rear lamps. Remedy Rear lamp: Remedy 1: Clearing…
- Complaint The driver's seat memory settings do not synchronize with the driver's user profile as described…
Complaint The driver's seat memory settings do not synchronize with the driver's user profile as described in the operator's manual. Driver's seat settings are not transferred to the vehicle. Cause The driver's seat…
- Noises in the steering column area when steering
Under analysis. Check which area of the steering column the noises occur in. Do the noises tend to occur at the bottom in the driver footwell or do they tend to occur in the area of the steering column switch module…
NHTSA lists 24 bulletins for this year; the 12 newest are shown here.
Questions and answers
What are the most common problems with the 2021 Mercedes-Benz EQC 400 E?
There are no owner complaints in the NHTSA data for this year; the data comes from 24 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2021 Mercedes-Benz EQC 400 E?
NHTSA lists 24 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 2021 Mercedes-Benz EQC 400 E 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 2021 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.