OBD2 Code B2490: Underhood Lamp Short to Battery

The B2490 diagnostic trouble code indicates that the body control module (BCM), front electronic module (FEM), or the relevant lighting module has detected a short circuit to battery positive (B+) in the output circuit for the underhood lamp. The module monitors the expected load and sets this code when it sees a permanently high voltage level, equivalent to direct contact with battery positive, preventing normal on/off control of the hood light. This fault is confined to the comfort and body subsystem and does not affect the drivetrain, brakes, steering, or active safety systems. The code typically sets during routine diagnostic tests performed by the module after ignition cycles.