Before spending hundreds at a dealership, try these steps in order: 1. Replace the Key Fob Battery
It sounds simple, but a fresh CR2032 (or similar) battery fixes a significant percentage of B173D errors. After replacing it, you may need to re-sync the key by putting it in the ignition, turning to position 2, and holding the lock button for 10 seconds.
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
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
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. Before spending hundreds at a dealership, try these
On Peugeot and Citroën (PSA Group) vehicles, is defined as:
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 The simplest cause
The car starts fine some days but fails others, often in cold or damp weather.
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?