Other modern Peugeot models (2008, 308, 508) utilizing the PSA Group’s latest electronic architecture. Key Symptoms of a B173D Fault
When B173D becomes active, it breaks the communication chain required to authorize engine startup. This detailed guide breaks down why this fault happens, the symptoms to look out for, and how to fix it systematically. 🛠️ Symptoms of Fault Code B173D
Unplug the electrical connector from the glow plug control unit and test each glow plug directly at the unit's connector pins. You need the pinout diagram for your specific Peugeot engine (DV6 or DW10). For cylinder 4, you should see approximately 0.6 to 1.2 Ohms .
If the vehicle starts cleanly with the secondary key, your primary key's transponder chip is damaged or desynchronized, requiring a locksmith to clone or re-program it. b173d peugeot
Use a digital multimeter to measure your primary car battery across its terminals. A healthy, resting battery must register at least . If the battery reads below 12.2 volts, the BSI may experience communication dropouts when looking for the key transponder. Replace the battery if it fails a load test. Step 5: Inspect Key Reader and Antenna Wiring
If the fault returns, hook up a vehicle scanner capable of reading manufacturer-specific PSA telemetry (such as or a premium iCarsoft unit).
The Peugeot fault code identifies an error in the mechanical/electronic key or hands-free remote control recognition Other modern Peugeot models (2008, 308, 508) utilizing
Peugeots are highly sensitive to voltage disruptions. A failing (Battery Protection and Management Unit) or a glitching BSI can stop sending correct operating voltages to the key reader, triggering false sensor readings and diagnostic confusion. Step-by-Step Diagnostic and Repair Protocol
: Sometimes the car's computer needs a reset. This can often be fixed by a BSI Reboot
The most common and easiest fix; a weak battery can prevent the hands-free signal from being strong enough for the reader. The "BSI Glitch": 🛠️ Symptoms of Fault Code B173D Unplug the
For keyless vehicles exhibiting a "Key Not Detected" warning, find the designated mechanical backup slot or receiver pocket. This is usually located inside the glovebox, behind a small panel under the steering column, or at the base of the center console. Place the physical key body directly against this area and try cranking the engine. This relies on passive induction rather than battery power to validate the transponder. Step 3: Perform a BSI Reset (The Hard Reboot)
: If the car starts with a second key, the issue is isolated to the original key fob.
Proximity systems always have an emergency override backup spot. This is usually a physical slot in the dashboard or a designated target emblem on the steering column shroud.