B173d Peugeot Work !!top!! May 2026

Date of Report:

Diagnostic Report: Peugeot/Citroën B173D Fault Code April 26, 2026 Subject: B173D — Fault in Identifying Key/Remote (Intermittent) 1. Executive Summary

• DIY minor wiring repair: low cost, 0.5–2 hours.
• Latch actuator replacement (parts + labor): moderate cost, 1–2 hours.
• BCM diagnosis/software update at dealer: diagnostic fee + possible reprogramming cost.

While a brake switch sounds like a minor component, modern Peugeots use this signal for: b173d peugeot work

Code:

B173D Manufacturer: Peugeot / Citroën (PSA Group) System: Body Control Module (BCU/BSI) / Locking Architecture Description: Lock Assembly / Door Lock Signal Plausibility Error Variant: Often accompanied by suffixes like 5A (Upper Limit) or 4A (Signal Invalid). DIY minor wiring repair: low cost, 0

• Open under-bonnet fuse box (BPGA).
• Identify the pre-heat relay (usually marked “R5” or “GPR” – Glow Plug Relay).
• Remove the relay. Using a multimeter:

  Check the Key Fob

  : Replace the coin battery in your remote and try using a spare key if available. While a brake switch sounds like a minor

  Key or Remote Failure

  : The internal transponder chip or the hands-free remote battery may be failing.