B173d Peugeot

On Peugeot and Citroën (PSA Group) vehicles, is defined as:

Change the key fob battery out for a fresh, high-quality CR2032 battery.

Fault code on a Peugeot indicates an "Error identifying the mechanical/electronic key or hands-free remote control" . This means your car's Built-in Systems Interface (BSI) or Body Control Module is struggling to recognize the signal from your key or transponder.

The most common cause. Glow plugs have a heating element that expands and contracts thousands of times. Eventually, the tip breaks or the internal coil melts. When you test the resistance of a healthy glow plug, it should read between . A failed plug will read "OL" (Over Limit) or infinite resistance.

External radio signals or a poor vehicle battery can cause communication errors. How to Fix It b173d peugeot

This comprehensive guide breaks down the symptoms, underlying causes, and step-by-step diagnostic workflows for addressing the B173D code across modern Peugeot models like the 208, 308, 508, 3008, and Partner. 📋 Comprehensive Fault Overview: Code B173D

The Peugeot BSI module suffers a temporary configuration memory loop or data corruption.

It is crucial to distinguish this Peugeot-specific B173D code from identical numeric codes used by other manufacturers. For example, on certain RAM vehicles, B173D refers to a "Right Power Sliding Door Latch Control 1 Circuit Low" fault, which is entirely unrelated.

If the problem persists, use a diagnostic tool like Lexia/Diagbox to monitor live data parameters. Check if the BSI changes status when a key is physically inserted into the reader slot. If the data stream shows no change, the key reader coil or its wiring harness behind the dashboard panel may be unplugged, damaged, or shorted. On Peugeot and Citroën (PSA Group) vehicles, is

If possible, swap the Cylinder 4 glow plug with Cylinder 1. Clear the codes and restart.

Before condemning any hardware, performing a BSI reset is a critical diagnostic step. This can often clear temporary software glitches causing the fault. The factory reset procedure involves a precise sequence of steps: disconnecting the battery, waiting, and then reconnecting it in a specific order. (See the FAQ section below for a detailed guide).

Before taking components apart, swap out the battery inside your remote control. Use a high-quality name-brand CR2032 battery. Clean any micro-corrosion off the internal metal contact tabs inside the fob using a drop of rubbing alcohol on a cotton swab. Step 2: Test the Spare Key Attempt to start the Peugeot using your backup factory key.

If your diagnostics point to a persistent BSI fault, failed CAN bus communication, or if you lack the tools and expertise, it's time to seek professional help. The most common cause

The most frequent cause; the signal is too weak for the car to pick up.

The code is a classic, predictable failure on modern Peugeot, Citroen, and DS diesel engines. While the code sounds like a complex body control module error, it is almost always a simple electrical fault in the cylinder 4 glow plug circuit.

Encountering the B173D fault code often manifests through one or more noticeable symptoms. The most frequent signs include: