Ignition Barrel Seized

Why Cold Weather Causes Ignition Problems

Metal contracts in the cold. When a van has an ignition barrel that's already worn — as most high-mileage fleet vehicles do — overnight temperature drops can cause the internal tumblers to seize in a position where a worn key can no longer turn them.

This is especially common in Ford Transit, Mercedes Sprinter and VW Transporter vans, all of which use barrel designs that are prone to wear after heavy use.

How To Tell If It's The Barrel Or Something Else

• Key turns but nothing happens: Could be the ignition switch behind the barrel, a flat battery, or an immobiliser fault — not the barrel itself.
• Key won't turn at all: Likely a seized barrel, worn key, or steering column lock engaged. This is the classic cold-morning scenario.
• Key turns partway then stops: Usually barrel wear combined with a worn key. Both may need attention.

Can You Fix It Yourself?

In some cases, spraying WD-40 or a dedicated lock lubricant into the barrel and working the key gently back and forth will free it temporarily. Do not force the key — a snapped key in the barrel is a much harder problem to solve.

If lubrication doesn't work within a few minutes, stop and call a specialist. Forcing the barrel risks snapping the key inside it or damaging the steering column lock mechanism.

What We Do

CarLocksmithAM carries replacement ignition barrels for most common van makes on board every vehicle. We can diagnose the problem on arrival and, in most cases, have a replacement barrel fitted and your van running within 45–60 minutes of arriving on site.

We operate from 4am every day — so if your delivery run starts at 6am, call us as soon as you discover the problem and we'll aim to have you moving before you're due to leave.