Code Definition

B2590 — Vehicle Park/Speed Signal Circuit Failure

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

About B2590

B2590 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 B2590 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 B2590 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 B2590 fault code is set when the Body Control Module (BCM) detects a failure in the vehicle Park or Speed signal circuit. The BCM uses these inputs to manage convenience features such as automatic door locking above a speed threshold, ignition key release interlock, automatic shift lock, and seat memory functions. The Park signal is typically derived from the transmission range sensor (PRNDL) and the speed signal from the vehicle speed sensor or ABS module, with both commonly shared over the CAN bus. When this code is set, the driver may notice that doors do not auto lock at speed, the ign...

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