Code Definition

P0624 — Fuel cap lamp control circuit malfunction.

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0624

P0624 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0624 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0624 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0624 fault code is triggered when the control module detects a malfunction in the fuel cap lamp control circuit. This circuit is responsible for activating the fuel cap warning light on the vehicle’s dashboard, indicating that the fuel cap is not properly secured. The code is set when the control module identifies an electrical fault in the circuit, such as an open circuit, short circuit, or an unexpected voltage condition. This malfunction may prevent the fuel cap warning light from operating correctly.

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