B173d Peugeot Work -

The keyless entry antennas, which detect the presence of the key, are failing.

Modern PSA electrical architectures are highly voltage-sensitive. If the main car battery falls below 12.5V rest voltage, modules like the BSI drop minor sub-routines during cranking to preserve power for core engine functions. The key recognition sequence is often the first routine dropped, generating a false B173D code. Step-by-Step Diagnostic & Repair Procedure

On modern Peugeots (such as the 208, 308, and Rifter), B173D is frequently accompanied by a cascade of related codes like B1808 (Immobilizer reading error) and U1F00 (Error log loss). Primary Causes of B173D in Peugeot Vehicles b173d peugeot work

Disclaimer: Automotive diagnostics can be complex. If you are not familiar with electrical systems, consult a professional.

If you own a modern Peugeot—specifically models like the Peugeot 3008 , 5008, or Citroën Picasso —and are encountering an "Electrical Circuit Fault" or the car refuses to start, the fault code is a likely culprit. This article will break down what "B173D Peugeot work" entails, why it happens, and how to fix this immobilizer-related error. What is the B173D Peugeot Fault Code? The keyless entry antennas, which detect the presence

Low voltage in the CR2032/CR2016 remote battery weakens the transponder handshake. Low (Easy Fix)

: The root cause points to the vehicle's onboard receiving hardware, wiring, or BSI module. Step 2: Key Fob Battery and Contact Maintenance The key recognition sequence is often the first

Perform a state-of-health test on your car battery. If it sits below 12.2V with the engine off, charge or replace it.

Replace the key fob battery with a premium-brand replacement. While the casing is open, use a cotton swab dipped in isopropyl alcohol to clean the metallic battery terminal contacts. Ensure the contacts are bent upward slightly to exert firm pressure on the battery surface. Step 3: Perform a Hardware BSI Hard Reset

: Blown fuses in the BSI or loose connections in the CAN bus network can prevent the reader from communicating with the ECU. Troubleshooting and Fixes

Locate the main earth points for the BSI, engine ECU, and ABS unit (usually on the chassis near the fuse boxes, or on the cylinder head). Ensure the terminals are clean, tight, and free from corrosion. A poor earth can cause the BSI to send corrupted signals, triggering B173D and other codes.