Code Definition

B0655 — Brake Light Switch Circuit Incorrect Signal

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

About B0655

B0655 is a generic (obd-ii standard) body diagnostic trouble code recorded for Holden vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B0655 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 B0655 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

On Holden vehicles, the Body Control Module (BCM) continuously monitors the brake light switch signal to confirm correct brake pedal application status. DTC B0655 is set when the BCM detects a brake switch signal that is implausible or inconsistent with expected operating conditions. This may include a signal that does not correspond with brake pedal position, conflicts with redundant brake switch inputs, or remains stuck in an ON or OFF state for a calibrated period. The fault indicates an incorrect electrical signal rather than a simple open or short circuit.

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