Work: B173d Peugeot

This is the most common cause. Even if the light on the fob turns on, the battery might not have enough voltage to transmit the passive code to the car. Change it with a high-quality, new battery 1.2.1. 2. Try the Spare Key

The vehicle may start perfectly fine in the morning but refuse to crank after a short trip.

Disclaimer: This information is for informational purposes only. Working on vehicle electronics can be risky. If unsure, consult a qualified technician.

When this code registers, your vehicle fails to recognize the transponder code or keyless access authorization signal. This issue halts the vehicle's starting mechanism as a theft-prevention safety measure. Understanding how the Built-In Systems Interface (BSI) handles this data is vital to diagnostic and repair work on affected Peugeot models. Technical Breakdown of DTC B173D b173d peugeot work

If the battery checks out, the next step is to look for a blown fuse. The BSI has multiple power feeds. One is constant, and another is controlled by the ignition switch. If that second power feed fails, the BSI may not wake up properly. Many DIY mechanics have successfully resolved the B173D by finding and replacing a simple fuse:

The B173D fault code is a specific error code that appears on Peugeot vehicles, indicating a problem with the vehicle's electrical system. This code is related to the vehicle's Body Control Module (BCM) and is often referred to as a " Peugeot B173D fault code" or "B173D Peugeot work".

In the context of Peugeot’s (PSA Group) diagnostic architecture, is a manufacturer-specific body control code. Unlike generic OBD2 codes (P0300 for misfire, for example), B-codes relate to internal body electronics, lighting, and power management. This is the most common cause

Generic OBD2 scanners often misinterpret BSI codes. A Peugeot-specific DiagBox or PP2000 scanner is required to:

If your vehicle has stored code B173D, you may experience the following symptoms:

The BSI module can suffer from "unexpected reinitialization" glitches. This frequently happens if the vehicle's main 12V battery drops below an acceptable voltage threshold during startup or if the battery was disconnected without following the strict manufacturing wait times. The module loses its rolling code sync with the keys. 3. Faulty Key Reader or Proximity Antenna Working on vehicle electronics can be risky

In simple terms, this code indicates that the Body Control Module (BSI) has detected a discrepancy between the command sent to the door lock and the status signal returned by the door lock mechanism. The BSI commands the door to lock, but the feedback circuit tells the BSI the door is still unlocked (or vice versa).

Measure the voltage of your main car battery (it should be over 12.5V). If it is below 12V, charge or replace it. 4. Perform a BSI Reset (PEUGEOT "Wake-Up" Procedure) Sometimes the BSI module needs to be forced into a reset.

: The central multi-function dashboard display or instrument cluster will show a message stating the remote control is missing or unrecognized.

The "work" to fix B173D often follows a specific path of elimination: The Key Test: