NHTSA vehicle safety data
2021 MCI D4520 Recalls, Ratings & Complaints
The 2021 MCI D4520 has 2 NHTSA recall campaigns and 0 owner complaints on file as of October 16, 2026. Recall repairs are usually free at an authorized MCI dealer.
NHTSA recall and complaint data for the 2021 MCI D4520. Recall data is refreshed daily from NHTSA.
EXTERIOR LIGHTING:HAZARD FLASHING WARNING LIGHTS
NHTSA #26V645000Reported October 5, 2026 · Motor Coach Industries, Inc
Potentially affected: 683 vehicles
Defect description
Motor Coach Industries (MCI) is recalling certain 2018-2026 buses. Please see the complete list of models above. The instrument panel indicator light may not illuminate when the hazard warning lights are on and the master run switch is in the 'Off' position. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamps, Reflective Devices, and Associated Equipment."
Safety consequence
Without the illuminated reminder, the driver may fail to turn off the exterior lights when no longer needed. Hazard warning lights that remain activated unintentionally can confuse other drivers, increasing the risk of a crash.
Manufacturer remedy
MCI will update the software, free of charge. Owner notification letters are expected to be mailed November 24, 2026. Owners may contact MCI customer service at 1-800-241-2947.
FUEL SYSTEM, DIESEL:FUEL INJECTION SYSTEM:FUEL RAIL
NHTSA #21V971000Reported December 15, 2021 · Motor Coach Industries
Potentially affected: 1,125 vehicles
Defect description
Motor Coach Industries (MCI) is recalling certain 2019-2022 D4000 ISTV, D4500, 2021 D4000, D4520, 2020-2021 D4505, D4005, 2020-2022 D45CRTLE, and 2019-2021 J4500 vehicles equipped with certain Cummins X12 diesel engines. The fuel tubes between the fuel rail and the injectors for cylinders four, five, and six may fatigue and crack, which can result in a high pressure fuel leak.
Safety consequence
A high pressure fuel leak in the presence of an ignition source can increase the risk of a fire.
Manufacturer remedy
On engines with 75 miles or less, Cummins dealers will install vibration isolators to the fuel tubes. Engines with more than 75 miles will receive new fuel tubes with vibration isolators. Repairs will be performed free of charge. Owner notification letters were mailed March 11, 2022. Owners may contact MCI customer service at 1-800-241-2947. MCI's number for this recall is R21-028.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
Other MCI D4520 model years
Check your 2021 MCI D4520 VIN
Not every recall applies to every VIN in a given year. Enter the 17-character VIN from your MCI D4520 at nhtsa.gov/recalls to see whether your specific vehicle has an unrepaired recall.
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