P0624 code meaning
Fuel Cap Lamp Control Circuit
What P0624 means
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.
P0624 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0624
- Fuel cap lamp never lights or stays on
- A loose cap is no longer indicated
- No driving symptoms
Common causes of P0624
- Most likelyWire or connector to the warning lamp or instrument cluster
- PossibleBulb/LED or instrument cluster faulty
- Less likelyOutput driver in the engine or body module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel cap warning lampInstrument clusterLamp control circuit
What each part of P0624 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 24 | The exact fault in that area. |
What to do next
- Note P0624 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0624
What does P0624 mean?
P0624 means "Fuel Cap Lamp Control Circuit". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0624?
P0624 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0624 fail an emissions test?
P0624 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0624 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0624 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.