AI Damage2025 MCI D4520: common problems
The maker issued 8 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 8
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 0 | 0 | 4 |
| Steering | 0 | 0 | 2 |
| Engine | 0 | 0 | 1 |
| Service brakes | 0 | 0 | 1 |
| Suspension | 0 | 0 | 1 |
| Other | 0 | 0 | 1 |
Comparison
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- This bulletin is to provide instructions for clearing DTC 1067 FMI 7 (Pressure Sensor Not Calibrated) and…
This bulletin is to provide instructions for clearing DTC 1067 FMI 7 (Pressure Sensor Not Calibrated) and FMI 11 (Primary and Secondary Circuit Pressure Sensor (PS1/PS2) Plausibility Error - BS Pressure), when required…
- This bulletin introduces an optional product improvement to the A/C compressor drive system for coaches…
This bulletin introduces an optional product improvement to the A/C compressor drive system for coaches equipped with a Cummins X12. The improved pulley system is available for customers who wish to reduce noise and…
- Instructions for installing updated software to allow the PLC system to "sleep"
- This TSIB provides information to provide a software update
Some coaches using MCC HVAC Eco-Tempo ECU # 07-10-009 software T35-1581 / V1.04 may be experiencing random fault codes due to MCC software errors.
- This TSIB is to inform customers the recommended steering axle cleaning/greasing instructions to prevent…
This TSIB is to inform customers the recommended steering axle cleaning/greasing instructions to prevent damage on axle components due to displacement of grease from the bearings, lubrication reduction and accelerate…
- 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…
MCI noticed that some customers operating in severe duty environments were experiencing the exterior U-Joints of the lower steering shaft binding due to corrosion. Because of this, MCI has developed a new re-greaseable…
- This TSIB is to remind MCI coach operators that when servicing the HVAC belts, idler pulleys or the lower…
This TSIB is to remind MCI coach operators that when servicing the HVAC belts, idler pulleys or the lower mount of the idler pulley bracket, ensure that the lower mount is adjusted so it is not contacting the bumper…
Other years of this model
Questions and answers
What are the most common problems with the 2025 MCI D4520?
There are no owner complaints in the NHTSA data for this year; the data comes from 8 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2025 MCI D4520?
NHTSA lists 8 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 2025 MCI D4520 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 2025 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 2026-11-04.