P04B5: Fuel Fill Door Stuck Open
What to do
Ask where this car's manual fuel door release is, usually a small cable or lever inside the boot near the rear light. It is worth knowing regardless of this fault — it is what gets you fuel if the door ever refuses to open.
Ask for the hinge, latch and any release cable to be checked before the actuator is replaced. Ice, road salt or a bent hinge stop a door latching, and those are much cheaper than a motor.
In the meantime, be aware the fuel tank is not secured, which is worth considering for where you park.
Take care in car parks and narrow spaces — a filler door standing open catches on pillars and hedges and bends easily.
What this code means
The powered fuel filler door is not closing when commanded.
A filler door that the vehicle controls electrically is a recent addition to most cars, and it exists for more reasons than convenience. It is locked with the doors, which deters fuel theft and siphoning; it is held shut while the vehicle is moving; and on vehicles with a sealed fuel tank it will not open until the tank has been vented, so the driver is not met by a rush of pressurised vapour.
Stuck open is the less serious of the pair — the vehicle can still be refuelled — but it is not trivial.
- The tank is no longer secured, which matters for theft and for insurance.
- On some vehicles the door being open inhibits functions or produces a persistent warning.
- A door standing open is easily damaged by a car park pillar or a hedge.
Check the mechanical side before the electrical one, because it is commoner and cheaper. Ice, road salt, a bent hinge or a strained release cable all stop a door latching, and none of them is an actuator fault.
Where the actuator genuinely has failed, note that on many vehicles it is a small motor built into the door assembly rather than a serviceable part — so ask what is actually being replaced before agreeing.
Most vehicles have a manual release, usually a cable or lever in the boot, and knowing where it is on this car is worth asking about.
Likely causes
Start here
- Faulty fuel filler door actuator · moderate
- Seized or damaged fuel filler door hinge · easy
Less common
- Corroded or loose connector · easy
- Water ingress into connector · easy
- Open circuit in control wiring · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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