B173d Peugeot Work Page

Diagnostic Report: Peugeot/Citroën B173D Fault Code April 26, 2026 Subject: B173D — Fault in Identifying Key/Remote (Intermittent) 1. Executive Summary

In the world of modern automotive repair, the diagnostic trouble code (DTC) is the compass that guides the technician through the labyrinth of electronic systems. When a Peugeot technician encounters an obscure code like "B173D," they are not facing a simple sensor replacement but rather an invitation to engage in systematic forensic analysis. While this specific code does not exist in official documentation, treating it as a case study for electrical fault finding reveals the sophisticated reality of maintaining contemporary French automobiles, particularly those from the PSA (Peugeot-Citroën) group.

If you are a mechanic or a DIY enthusiast using a diagnostic tool, "B173D" refers to a .

This comprehensive guide breaks down what the B173D code means, why it happens, and how to get your Peugeot working smoothly again. What is Fault Code B173D? b173d peugeot work

Follow this systematic diagnostic workflow to resolve the fault.

To diagnose and repair the B173D fault code on a Peugeot vehicle, follow these steps:

(mobile phones, NFC devices) that could interfere with the transponder signal. While this specific code does not exist in

The B173D fault code is officially described as:

This is surprisingly common. In some cases, the equipment used for the inspection can cause an electrical disturbance or voltage spike, confusing the BSI and triggering this fault code. The fix is often as simple as clearing the code with a diagnostic tool and performing a BSI reset.

: It frequently appears alongside other codes like B1808 (engine ECU immobilizer unlocking fault) or B1624 (protection unit relay faults). Common Causes What is Fault Code B173D

After you've replaced the battery, changed a fuse, or done any electrical repair, you reset the BSI. This procedure is critical to clear the old, incorrect data from the BSI's memory and let it re-learn the key's code:

The doors may not respond to the proximity sensors when grabbing the door handles. Top Causes Behind the B173D Error

: The internal transponder chip or the hands-free remote battery may be failing.

When code B173D becomes active, you will typically experience one or more of the following warning signs: