Code Definition

B2505 — LF LAMP HIGH BEAM CIRCUIT Failure

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

About B2505

B2505 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 B2505 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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 B2505 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) or front lighting module controls the left front high beam headlamp by switching battery voltage or ground to the bulb on demand, with feedback monitoring to confirm correct operation. DTC B2505 is set when the BCM detects an out of specification condition on the left front high beam circuit, generally when the expected current draw or feedback voltage is absent during a high beam activation, indicating an open bulb, an open wire, or a high resistance fault in the supply or return path. The BCM logs this code and typically displays a lamp out warning. When set, th...

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