Code Definition

B2508 — RF LAMP HIGH BEAM CIRCUIT Short to Battery

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

About B2508

B2508 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 B2508 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and 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 B2508 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) monitors the right front high beam lamp circuit for electrical faults using a sense line on the output driver. DTC B2508 is set when the BCM detects battery voltage on the right front high beam control circuit when it should be off, indicating an unintended short to battery condition. This commonly occurs when a chafed control wire makes contact with a power feed, when a connector internally bridges to a battery pin, or when an aftermarket lighting installation is incorrectly tied into the OE circuit. When this code sets the right side high beam may be on constant...

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