AI DamageMCI D4520: problems, complaints, bulletins
Summary for the MCI D4520 across 7 model years: 0 owner complaints and 25 NHTSA service bulletins, plus repair videos. Pick a year for details.
Model years
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 0 | 0 | 21 |
| Engine | 0 | 0 | 12 |
| Service brakes | 0 | 0 | 10 |
| Structure | 0 | 0 | 9 |
| Steering | 0 | 0 | 8 |
| Suspension | 0 | 0 | 6 |
| Fuel system | 0 | 0 | 5 |
| Equipment | 0 | 0 | 4 |
| Engine and cooling | 0 | 0 | 3 |
| Latches, locks, linkages | 0 | 0 | 2 |
| Seats | 0 | 0 | 1 |
| Other | 0 | 0 | 7 |
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Instructions to verify compression fitting P/N 19-10-1335 is installed correctly
- This bulletin is to provide instructions for clearing DTC 1067 FMI 7 (Pressure Sensor Not Calibrated) and…
- This bulletin introduces an optional product improvement to the A/C compressor drive system for coaches…
- Instructions for installing updated software to allow the PLC system to "sleep"
- This TSIB provides information to provide a software update
- This TSIB is to inform customers the recommended steering axle cleaning/greasing instructions to prevent…
- Instructions to verify security of interior REI brand monitors on affected coaches
- MCI noticed that some customers operating in severe duty environments were experiencing the exterior…
- This TSIB is to remind MCI coach operators that when servicing the HVAC belts, idler pulleys or the lower…
- Information to owners showing the proper procedure for checking the oil level in a BITZER HVAC compressor
- Install handle lever stopper brackets on the Rear Side Service & Wheelchair Lift doors
- Service instruction for updating plug doors to improve reliability and reduce wind noise
Other models of this make
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 2026-11-04.