Vehicle recallDVSA
Alexander Dennis Enviro 400 H recalled over a fire risk
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.
Check your product
Only vehicles within the listed VIN ranges or build dates are covered. A franchised dealer can confirm from your VIN.
1 identifier listed for this notice.
Enviro 400 H
- Build datesThe build or first registration date is on the V5C.
- 01/01/2016 – 31/12/2020
- Manufacturer referenceThe manufacturer’s own campaign number. Quote it to the dealer.
- xxxx
What to do now
There is a risk of fire on affected Alexander Dennis Enviro 400 H.
- Check whether your vehicle is affected using its registration number on the GOV.UK vehicle recall checker, or ask a franchised dealer.
- Contact a franchised dealer to book the free repair.
- Keep the manufacturer’s recall letter if you receive one, and update your address on the V5C so future letters reach you.
Why it matters. Vehicle fires can start while driving or parked. Some manufacturers advise parking outside until the repair is done.
Repairs and costs
Safety recall work is carried out by franchised dealers free of charge, whether or not you are the first owner and whether or not the vehicle is still under warranty.
If a dealer will not carry out the recall work, contact the manufacturer’s customer services and, if that does not resolve it, the DVSA.
From the official notice
Published by the Driver and Vehicle Standards Agency (R/2025/419). Quoted as issued.
Summary
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.
Defect
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.
Remedy
Install a crankcase pressure sensor and a pressure relief valve.
Models
Enviro 400 H
Open the DVSA notice
Questions
Why are Alexander Dennis Enviro 400 H being recalled?
There is a risk of fire on affected Alexander Dennis Enviro 400 H. Vehicle fires can start while driving or parked. Some manufacturers advise parking outside until the repair is done.
How do I know if my vehicle is affected?
Enter your registration number on the GOV.UK vehicle recall checker or ask a franchised dealer, who can check your VIN against the manufacturer’s campaign. The VIN ranges and build dates published by the DVSA are listed on this page.
What should I do now?
Check whether your vehicle is affected using its registration number on the GOV.UK vehicle recall checker, or ask a franchised dealer. Contact a franchised dealer to book the free repair.
Will the repair cost anything?
Safety recall work is carried out by franchised dealers free of charge, whether or not you are the first owner and whether or not the vehicle is still under warranty. If a dealer will not carry out the recall work, contact the manufacturer’s customer services and, if that does not resolve it, the DVSA.