2021 MCI D4000, 2019–2022 MCI D4000 Istv, 2020–2021 MCI D4005 and 5 other models Recall: Fuel tubes between the fuel rail and the injectors for cylinders four…
NHTSA campaign 21V971000 · Fuel System, Diesel · filed Dec 15, 2021 · verified Jul 30, 2026
The 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.
The risk
A high pressure fuel leak in the presence of an ignition source can increase the risk of a fire.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
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.
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.
Affected vehicles
Related recalls
More MCI D4000 recalls
- 1988–2001 MCI 102D3 and 11 other models — Please refer to MCI's recall report for specific model year…
- 2014–2018 MCI D4000 and 4 other models — Red beacon lighting on the Threshold Warning System (TWS)…
- 2018 MCI D4000 and 8 other models — Main Distribution Panel (MDP) located within the battery…
- 2017–2018 MCI D4000 and 7 other models — Sealing washer may not seat correctly in the pilot bore…
- 2018–2020 MCI D4000 and 5 other models — A build-up of debris, corrosion, and/or water flow could…
Other campaigns involving MCI vehicles
Source: NHTSA recall database, campaign 21V971000 (manufacturer number R21-028). Data last verified Jul 30, 2026.