2021 Mci D4520

Routine

No owner complaints are on file for this vehicle. It has been recalled 1 time.

1 safety recall

Part 573 reports

Fuel System, Diesel › Fuel Injection System › Fuel Rail21V971000

Filed Dec 15, 20211,125 vehiclesMotor Coach Industries

Defect. 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.

Risk. A high pressure fuel leak in the presence of an ignition source can increase the risk of a fire.

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.

Across model years

Worst on record: 2025

Year	Recalls	Assessment
2025	1	Routine
2021 — this page	1	Routine
2020	1	Routine

Compare every D4520 year →

Other Mci models

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J4500 3

Reading this record

No unusual pattern of severe incidents in the complaint record.

Complaint counts track how many cars were sold and how long they have been on the road as much as they track quality. A common model from 2013 has had a decade to accumulate reports; a rare one from last year has not. The signal worth weighing is in the severity columns, in whether the same component keeps appearing, and in whether the manufacturer eventually opened a recall for it.

Recall repairs are free for as long as the recall stands. Check whether a specific car still has open work at NHTSA's VIN lookup.

Most recent recall on file: Dec 15, 2021. Source: NHTSA Office of Defects Investigation.