B173d Peugeot Work ((top)) Jun 2026

error message, often accompanied by other, seemingly unrelated codes (like B173A, B1808).

: The car may refuse to turn over because the immobilizer is not being disarmed.

The cost varies dramatically depending on the root cause. Fuse or relay replacements are minimal costs (often just labor). A new battery might cost $150–$300. A faulty BSI replacement or reprogramming can cost $500–$1,000+, but this is rarely necessary for the B173D fault.

Disconnect the negative vehicle battery terminal and wait 15 seconds. b173d peugeot work

: Check the fuse box (BSI unit) for any blown fuses related to the ignition or anti-theft system.

This diagnostic trouble code (DTC) is frequently triggered by the Built-in Systems Interface (BSI) across various PSA Group vehicles, including the Peugeot 308 , 508

The B173D Peugeot work is a specific DTC that appears on the vehicle's onboard computer, also known as the Engine Control Module (ECM). This code is usually displayed on a scan tool or code reader, indicating that there's an issue with the vehicle's system. The "B" in B173D refers to the Body Control Module (BCM), which is responsible for controlling various functions such as lighting, wipers, and door locks. Fuse or relay replacements are minimal costs (often

: Turn the ignition to the "ON" position (without starting) and leave it for 2 minutes to allow the key and BSI to re-establish communication. Common Causes for B173D

If the relay tests fine, the issue is likely the .

The swiveling function of the headlights may be disabled. Disconnect the negative vehicle battery terminal and wait

: Models equipped with keyless entry/start slots will flash warning notifications across the multi-function display.

Finally, . The fix might be as simple as repairing a broken wire in the rubber boot between the door and the chassis (a classic Peugeot failure point) or as involved as reprogramming a replacement BSI—a process that requires downloading the vehicle's specific configuration from Peugeot’s servers and pairing it with the immobilizer transponder key.