B173d Peugeot Work !full! Jun 2026
If the main 12V battery in your Peugeot is failing, it can cause the BSI to malfunction and fail to properly communicate with the key.
: Blown fuses in the BSI or loose connections in the CAN bus network can prevent the reader from communicating with the ECU. Troubleshooting and Fixes
At first glance, code B173D might look like a reference to an engine type, but it is actually a that points to a communication problem within the vehicle's electrical architecture, most often related to the BSI (Built‑in Systems Interface) —the central body computer that manages lighting, locking, immobilizer, comfort functions, and more.
: It frequently appears alongside other codes like B1808 (engine ECU immobilizer unlocking fault) or B1624 (protection unit relay faults). Common Causes b173d peugeot work
Do you have a to test if the issue is with the car's reader or the specific remote? Electrical circuit fault: have your vehicle repaired
Another owner reported that after driving for 15–20 km, the "engine failure" message would appear, accompanied by codes B173D, B1808, B1137, and B1744. All systems appeared to work normally. The forum consensus pointed to a as the most likely cause, because low voltage or poor earthing can trigger a cascade of unrelated codes.
Locate the BSI unit (typically behind the glovebox or under the dashboard on the driver’s side in left‑hand drive vehicles). Open the BSI casing and visually inspect all fuses on the board. Pay special attention to any 10A fuses that supply power to the key reader or immobilizer. Replace any blown fuse. If the main 12V battery in your Peugeot
Switch off the ignition, close all doors, and wait 3 full minutes for the BSI to enter sleep mode.
When scanning the BSI via diagnostic tools like iCarSoft Units or PSA-specific Lexia software, B173D often pairs with B1808 (Engine management ECU immobilizer reading error) and U1F00 (Error event not stored).
The central computer (BSI) might have internal errors or corrupted software that needs a reset. : It frequently appears alongside other codes like
Several factors can cause the B173D fault code to appear on a Peugeot vehicle. Some of the most common causes include:
Q: How do I troubleshoot the B173D Peugeot work code? A: To troubleshoot the B173D Peugeot work code, use a scan tool to retrieve the DTC, check the actuator, wiring, and BCM, and check the voltage.
Preventing the B173D Peugeot work code requires regular maintenance and inspections. Here are some tips:
Keyless entry failure, engine refuses to crank, intermittent start issues
These symptoms can be confusing, but they often point away from the key itself and toward a power delivery issue affecting the BSI.
