If you've connected a diagnostic tool to your Peugeot and seen , you are likely dealing with a frustrating "no-start" or "key not detected" scenario. This specific manufacturer code is a common headache for owners of modern models like the Peugeot 308, 3008, 5008, and the Partner van. What Does Fault Code B173D Mean?
The physical coil or antenna that picks up the transponder signal (usually around the ignition switch or in the center console) may be faulty or have a loose connection. Troubleshooting and Fixes
The simplest cause. If the signal is too weak, the reader near the ignition barrel or in the cabin can't "handshake" with the key. b173d peugeot
Essentially, the car’s central computer (the or Built-in Systems Interface) cannot verify that a valid key is being used. Because this is tied to the immobiliser system , the vehicle will often refuse to crank or start to prevent theft. Common Symptoms
When B173D is active, you might notice one or more of the following: message on the dashboard. If you've connected a diagnostic tool to your
Peugeot electronics are notorious for throwing "ghost codes" when the main 12V battery is dying. Low voltage during the start-up sequence can cause the BSI to fail the key identification check.
The engine turns over, but the fuel or ignition is cut off. The physical coil or antenna that picks up
The remote buttons may stop working entirely. Why is it Happening? (Causes)
While a faulty key is the most obvious culprit, B173D is often a symptom of wider electrical "confusion" in the Peugeot's complex BSI system.
The car starts fine some days but fails others, often in cold or damp weather.
