Code Definition

P0623 — Charge lamp control circuit malfunction

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

About P0623

P0623 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 P0623 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 P0623 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 P0623 fault code is set when the Engine Control Module (ECM) detects a malfunction in the charge lamp control circuit. This circuit involves the charge indicator lamp (commonly known as the battery light) on the vehicle's dashboard and its connection to the charging system, typically the alternator. The charge lamp is an important feature that alerts the driver to potential issues with the vehicle's charging system, such as a failing alternator or problems within the electrical system. A malfunction in the charge lamp control circuit can lead to the indicator lamp not illuminating when the...

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