Code Definition

B2500 — COURTESY LAMP OUTPUT Ckt Short to Battery

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

About B2500

B2500 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2500 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B2500 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 Body Control Module (BCM) controls the interior courtesy lamps (dome, map, and footwell lamps) by switching battery voltage or ground to the lamp circuit on door opening, key fob unlock, or interior switch activation. DTC B2500 is set when the BCM detects a short to battery voltage on the courtesy lamp output circuit, meaning the control line is held at or near battery voltage when the BCM is commanding the output off. The BCM uses voltage feedback on this line to confirm its driver state; when the line cannot be pulled down because external voltage is feeding into the circuit, the BCM dis...

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