Code Definition

B2555 — LAMP DOME OUTPUT Circuit Short to Battery

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

About B2555

B2555 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 B2555 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 B2555 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. DTC B2555 sets when the module detects that the dome lamp output circuit is being held at battery voltage when it should be commanded off or driven low, indicating an unwanted battery feed on the output wire. The module compares actual output voltage against the commanded state to detect this condition. When this code sets, the dome lamp may stay illuminated permanently, fail to t...

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