Code Definition

B2554 — LAMP DOME OUTPUT Circuit Failure

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

About B2554

B2554 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 B2554 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 B2554 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 operates the dome lamp output circuit using an internal output driver, switching the lamp on or off based on door switch inputs, courtesy lighting requests, and timed entry and exit functions. The module monitors the output voltage feedback to verify the circuit is responding correctly to commands. DTC B2554 sets when the module detects a generic electrical failure on the dome lamp output circuit, which may include an open circuit, short to ground, short to battery, or unexpected current draw. When this code is set, the dome lamp may fail to operate, behave erratically,...

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