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Peugeot microprocessors can hang or freeze during a low-voltage start. A structural hardware reboot often clears ghost faults like B173D:
code is indeed an "interesting piece" of Peugeot (and Citroën) diagnostics, as it points directly to a breakdown in the conversation between the car and its key. Technically, it is defined as a Fault in identifying the mechanical/electronic key or the hands-free remote control present in the reader. Why it's a "Head-Scratcher" b173d peugeot
The OCS determines:
When triggers, the BSI expects a specific cryptographic identifier from the key but receives an invalid signal, a corrupted data packet, or no signal at all. Because the BSI cannot verify the key's identity, it halts the verification sequence. Common Companion Diagnostic Trouble Codes Peugeot microprocessors can hang or freeze during a