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Before taking the car to a dealer, replace the battery in your key fob (usually a CR2032). This solves the problem in over 90% of cases. 2. Use the "Emergency" Start Method
Attempt to start the vehicle using your . If the backup key works seamlessly, your primary key fob has a hardware defect or requires reprogramming.
Modern Peugeot engines (DV6 and DW10 BlueHDi) use a "Glow Plug Control Unit" that keeps the glow plugs active for up to 3 to 4 minutes after the engine starts. They assist with:
The B173D fault can be triggered when the BSI loses contact with the engine ECU. If this happens at the moment the key is inserted, the BSI logs the code as an “identification fault.” A Chinese technical source suggests that B173D may indicate: “The body computer is seriously damaged and the network communication is abnormal.” . This points to the need for checking the integrity of the vehicle’s data communication network. b173d peugeot
The OCS determines:
Immobilizer / Keyless Entry & Start (ADML) / Built-in Systems Interface (BSI).
Both codes are related to the BSI. B173D indicates the BSI cannot identify the key (communication error). Code B1808 indicates the BSI is failing to unlock the immobilizer via the engine ECU. They often appear together because the BSI cannot authorize the engine to start. Before taking the car to a dealer, replace
B173D is frequently accompanied by associated immobilizer or voltage codes, such as B1808 (Engine management ECU immobilizer reading error) or B1624 (Accessory Protection and Management Unit relay status fault). Primary Causes of B173D in Peugeot Vehicles
If a low or unstable battery was identified during diagnosis, replace the battery if necessary. Clean and tighten the battery terminals. Ensure the main power connections to the BSI are secure.
Locate the BSI unit (typically behind the dashboard fuse box). Inspect all fuses within the BSI for any signs of damage. Pay particular attention to the 10-amp fuses. Use the "Emergency" Start Method Attempt to start
The functions as the central gateway coordinator. Software bugs, water ingress from leaking windscreens, or incorrect vehicle configuration parameters (often flagged alongside code B2EA0 ) can cause communication drops across the immobiliser network. 🛠️ Step-by-Step Diagnostic & Troubleshooting Pathway
Use a digital multimeter to measure voltage across the car battery terminals. A healthy battery must read at least statically.
: The coil around the ignition barrel or the hands-free reader may be unable to pick up the key's signal. BSI Software Corruption
It seems you are asking for a review of the — however, no production Peugeot car model is named B173D .
External radio signals or a poor vehicle battery can cause communication errors. How to Fix It
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