Peugeot — B173d

Understanding Peugeot Fault Code B173D: Causes, Symptoms, and How to Fix It

The Peugeot BSI is the brain of the vehicle's cabin electronics, managing everything from central locking to transponder validation. b173d peugeot

Accessory Protection and Management Unit Central Switch Positive Relay Fault. Understanding Peugeot Fault Code B173D: Causes

Let’s cut through the confusion. The B173D fault code is a manufacturer-specific code used by the PSA Group (Peugeot and Citroën). Unlike universal OBD2 codes like “P0420” which many generic code readers can interpret, B-series codes often require more specific knowledge of the vehicle’s Body Systems Interface, known as the . known as the .