External electromagnetic noise (e.g., radar stations, large power lines, aftermarket dashcams) disrupts the keyless signal. Step-by-Step Diagnostic & Repair Procedure

The B173D fault code on a Peugeot vehicle can be caused by a variety of factors, including faulty door lock actuators, wiring issues, and Body Control Module problems. By understanding the causes of this fault code and following the diagnostic and repair steps outlined above, you should be able to resolve the issue and get your Peugeot vehicle running smoothly again. If you're not comfortable with DIY repairs or if the issue persists after attempting to diagnose and repair it, it's recommended to consult a professional mechanic or a Peugeot dealership for assistance.

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: The vehicle might start perfectly fine on a cold morning but fail to start entirely after a short trip to a shop.