Code Definition

B2566 — Right Tail Lamp Circuit Short to Ground

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

About B2566

B2566 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 B2566 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 B2566 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) or lighting control module monitors the right tail lamp circuit using internal current sense and short circuit detection on its smart driver outputs. DTC B2566 is set when the module detects that the right tail lamp control circuit is being pulled to chassis ground while commanded off, or that an excessive current flow occurs when the lamp is commanded on, indicating a short to ground in the wiring, the lamp socket, or the BCM output stage. To protect itself the module will typically disable the output after detecting the short, which may also blow the related lig...

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