OBD-II code · Powertrain (generic)
P0624 Fuel Cap Lamp Control Circuit
The control circuit for the fuel cap warning lamp reports a fault. The ECM cannot drive the indicator that warns of an open or loose fuel cap.
Is it safe to drive with P0624?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLamp circuit open or shorted
- Less likelyInstrument cluster fault
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Cap Lamp, Lamp Wiring
Related codes
- P0440Evaporative Emission Control System Malfunction
- P0455Evaporative Emission System Leak Detected (Large Leak)
- P0621Generator Lamp L Control Circuit
- P0622Generator Field F Control Circuit
- P0623Generator Lamp Control Circuit
- P0625Generator Field Terminal Circuit Low
- P0626Generator Field/F Terminal Circuit Performance
- P0627Fuel Pump "A" Control Circuit Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.