2017–2020 Alexander Dennis Enviro 500 Recall: Sealing washer may not seat correctly in the pilot bore holes, allowing…
NHTSA campaign 21V468000 · Fuel System, Diesel · filed Jun 23, 2021 · verified Jul 30, 2026
The defect
Alexander Dennis, Inc. (Alexander Dennis) is recalling certain 2017-2020 E500 buses. The sealing washer may not seat correctly in the pilot bore holes, allowing the high pressure fuel rail assembly to leak.
The risk
A fuel leak in the presence of an ignition source increases 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
Dealers will inspect the rail threads and fuel lines, and replace the rail as necessary, free of charge. Owner notification letters were mailed June 18, 2021. Owners may contact Alexander Dennis customer service at 1-951-244-9429.
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
| Make | Model | Model years |
|---|---|---|
| Alexander Dennis | Enviro 500 | 2017, 2018, 2019, 2020 |
Source: NHTSA recall database, campaign 21V468000. Data last verified Jul 30, 2026.