Code Definition

B173D — Error Identifying the Mechanical/Electronic Key or Hands-Free Remote Control

System: Body  |  Type: Manufacturer-Specific  |  Make: Peugeot

About B173D

B173D is a manufacturer-specific body diagnostic trouble code recorded for Peugeot vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B173D is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Built in Systems Interface (BSI) on Peugeot vehicles manages the immobiliser function and continuously verifies the encrypted transponder code in the mechanical key or the rolling code from the hands free remote. DTC B173D is stored when the BSI cannot validate the key identifier during an ignition ON event, a START request, or a keyless access attempt at the door handle. The fault may indicate a weak or unlearned transponder, an antenna or aerial circuit problem preventing the BSI from reading the key, or a communication breakdown between the BSI and the immobiliser memory. When this code...

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