Code Definition

B2556 — Enable Signal Circuit Short to Battery

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

About B2556

B2556 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 B2556 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 B2556 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 uses a dedicated enable signal output to permit operation of a related component such as a starter relay, fuel pump relay, ignition system, or passive anti theft system actuator. The module monitors the voltage on this output and compares it against the commanded state to verify correct circuit operation. DTC B2556 sets when the module detects that the enable signal output circuit is being held at battery voltage when it should be at ground or floating, indicating a short to battery in the wiring or the downstream receiving load. When this code is set, the controlled fu...

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