Peugeot: B173d

In Peugeot and Citroën vehicles, the fault code B173D specifically indicates a failure in identifying the mechanical or electronic key, or the hands-free remote control located in the reader. This body control fault is managed by the Built-in Systems Interface (BSI), which is the central computer responsible for security and electronics. Understanding the B173D Fault

When to seek professional help

  • Persistent fault codes after attempted resets.
  • Loss of significant power, white/blue/black smoke from exhaust.
  • Loud turbo noises or oil consumption spikes.
  • Failed emission tests.

On Peugeot and Citroën (PSA Group) vehicles, B173D is defined as: b173d peugeot

Switch off all electronics, close all doors, and remove the key from the ignition. for the BSI to go into "sleep mode." Disconnect the vehicle battery and wait at least 15 seconds Reconnect the battery and wait 10 seconds without touching anything. In Peugeot and Citroën vehicles, the fault code

  1. Model-specific code: B173D might refer to a specific Peugeot model, such as the Peugeot 207 or 308, which use similar coding systems. Perhaps the code is linked to a particular trim level, engine type, or transmission configuration.
  2. Chassis-specific issue: The B173D code could indicate a problem specific to certain chassis configurations, such as a particular suspension setup or braking system.
  3. Electrical system anomaly: It's possible that the code points to an electrical system issue, such as a faulty wiring harness, a malfunctioning sensor, or a software glitch.

"Fault in identifying the mechanical/electronic key or the remote control present in the reader." Persistent fault codes after attempted resets

  • Pin 1 (usually Black): Ground (0 ohms to chassis).
  • Pin 2 (usually Red/Yellow): 12V power supply from BSI (should be ~12V).
  • Pin 3 (usually other color): Signal wire to BSI (should show ~5V reference).
  • "Foldable Mirror Control: Open Circuit"
  • "Mirror Folding Motor: Circuit Open"