Opel B2585-00 May 2026

Live data showed Sensor 1 transitioning at 8mm pedal travel, Sensor 2 at 12mm travel. Physical inspection revealed a worn brake pedal bushing (plastic grommet at the pivot pin). The pedal had 3mm of lateral play, causing the switch plunger to contact the pedal arm at an angle. This uneven force triggered the two internal reed switches at different times.

Mechanic replaced the brake switch – code returned after 50 km. opel b2585-00

1. Introduction In the world of automotive diagnostics, few components are as deceptively simple yet mission-critical as the brake pedal switch. For Opel (Vauxhall) vehicles, particularly those built on GM’s global platforms (Delta II, Epsilon II, and later PSA-based architectures), the fault code B2585-00 presents a unique challenge. Unlike a simple “switch stuck” code, B2585-00 translates to: "Lamp Brake Pedal Position Switch – Plausibility Failure." Live data showed Sensor 1 transitioning at 8mm

Replaced pedal pivot bushings (part 13233840) and recalibrated a new switch. Code cleared permanently. This uneven force triggered the two internal reed

This code does not indicate an electrical open or short circuit. Instead, it signals a within the braking control system. The Engine Control Module (ECM) or Body Control Module (BCM) has detected that the signal from the brake pedal position sensor does not match the expected state based on other vehicle inputs (e.g., stop lamp circuit current monitoring, cruise control status, or transmission shift interlock).