Code Definition

B2550 — LAMP DOME OUTPUT Circuit Short to Ground

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

About B2550

B2550 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 B2550 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 B2550 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 B2550 sets when the module detects that the dome lamp output circuit is shorted to ground while it is being commanded to a specific state, indicating that current is flowing through an unintended path. The fault is typically detected by monitoring current draw or output voltage on the lamp control wire and comparing it against the commanded state. When this code sets, the dome...

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