P0624: Fuel Cap Lamp Control Circuit
What to do
Driveable with no effect on how the vehicle runs. Since the lamp that would tell you about a loose fuel cap may not work, it is worth checking the cap is tight after refuelling out of habit.
What this code means
A fault in the circuit driving a dedicated fuel cap warning lamp, fitted on vehicles that indicate a loose filler cap separately from the general engine warning. A minor fault in itself, but it removes the specific prompt that would otherwise save an owner an unnecessary diagnostic visit for an evaporative leak.
Likely causes
Start here
- Blown warning lamp bulb · easy
- Broken wire in control circuit · moderate
Less common
- Corroded or loose connector · easy
- Failed instrument cluster · specialist
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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