Alexander Dennis ENVIRO 400 H recall: Cummins’ ISB4.5 210HP EuroVI Engine Valve Cover Cracking Safety Campaign
Yes – some of these vehicles are being recalled
- What's wrong
- On vehicles with the affected engine the piston crown may develop a crack creating elevated crankcase pressure leading to a fracture of the valve cover. A fractured valve cover may allow oil to escape and in the presence of an ignition source increases the risk…
- What to do
- Contact a Alexander Dennis dealer to book the free repair. Install a crankcase pressure sensor and a pressure relief valve.
Source: Driver and Vehicle Standards Agency (DVSA)
Check your reg on DVSA ↗
What’s wrong
On vehicles with the affected engine the piston crown may develop a crack creating elevated crankcase pressure leading to a fracture of the valve cover. A fractured valve cover may allow oil to escape and in the presence of an ignition source increases the risk of a fire.
The fix
Install a crankcase pressure sensor and a pressure relief valve.
Vehicles affected
| Model | Built from | Built to | Vehicles |
|---|---|---|---|
| ENVIRO 400 H | 1 Jan 2016 | 31 Dec 2020 | 401 |
How to check your vehicle
Use the official DVSA checker with your registration number to see if your exact vehicle is included. If it is, the manufacturer should have written to the registered keeper. The repair is free, even if you bought the vehicle second-hand.
Updated 5 November 2025. This page summarises an official notice. Details can change – always follow the official notice.