Code Definition

B2585 — Left park lamp circuit control

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

About B2585

B2585 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 B2585 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 B2585 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

DTC B2585 is set by the Body Control Module (BCM) when it detects a fault in the left side park lamp (parking or position lamp) output circuit, such as an open circuit, a short to ground, or a short to battery voltage. The BCM switches the park lamps through an internal driver and monitors the circuit current and feedback, so it can flag a fault when the measured load does not match the commanded state. This may occur with a failed bulb or LED module, a wiring or connector fault, or a problem in the BCM output stage itself. When this code is set the left park lamp may be inoperative, stay on, ...

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