P0624Fuel Cap Lamp Control Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- Despite its neighbours, P0624 has nothing to do with the alternator: it is the control circuit of the 'check fuel cap' warning lamp of the evaporative system. Ford's evaporative monitor lights such a lamp when, after refuelling, the tank cannot be pulled into vacuum – a gross leak or missing cap (P0457) – and turns it off once the cap is secured; not every vehicle has this lamp. The module driving the lamp (engine or body module, depending on the vehicle) can monitor its output for open or short circuits. No manufacturer document available to us uses P0624 itself. The lamp is only a hint; the leak is reported with the check engine light as P0455/P0457, so P0624 itself is practically emission neutral under CARB. The lamp then never lights or stays on, and a loose cap is no longer indicated.
- What you may notice
- Fuel cap lamp never lights or stays on
- A loose cap is no longer indicated
- No driving symptoms
- Likely causes
- LikelyWire or connector to the warning lamp or instrument cluster
- PossibleBulb/LED or instrument cluster faulty
- RareOutput driver in the engine or body module
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.