According to diagnostic reports and official technical definitions, the B173D code points to a specific problem:
Even if the car allows you to unlock doors, a weak battery may lack the power to send the necessary signal for authentication during the start sequence. Replace the CR2032/CR2025 battery in your remote. 2. Signal Interference
Don’t throw parts at the problem. Follow this professional diagnostic flow:
The most debilitating symptom is a . Because the immobilizer system cannot verify that an authorized key is present, the BSI blocks the engine control unit (ECU) from engaging the starter motor or supplying fuel to the cylinders. 2. "Key Not Detected" Warning Messages b173d peugeot
: Issues with the transponder aerial (the ring around the ignition barrel) or associated wiring can disrupt the signal . Recommended Steps for Resolution
However, don’t ignore the code indefinitely. If it’s accompanied by the B1808 immobilizer code, your car may refuse to start at the worst possible moment. A few hours of methodical diagnostics now can save you from a tow truck call and a hefty repair bill later.
: The coil around the ignition barrel or the hands-free reader may be unable to pick up the key's signal. BSI Software Corruption Signal Interference Don’t throw parts at the problem
: If a remote control button is pressed repeatedly out of range of the vehicle, its rolling code counter can lose alignment with the BSI memory.
Understanding Peugeot Fault Code B173D: Causes, Symptoms, and Fixes
: Low vehicle battery voltage can cause "ghost" electrical faults in Peugeot's sensitive electronics. Ensure the battery maintains roughly when the engine is off. Based on recent diagnostic reports
The fault tracks back to an breakdown in communication between the encrypted transponder inside your key and the reading unit inside the vehicle cabin. The primary culprits include: Detailed Impact
: Sometimes the car's computer simply needs a "hard reboot" to recognize its programming again. The "Fix" (How to resolve B173D)
: Low voltage in the main car battery can cause the BSI (the car's "brain") to glitch and lose synchronization with the keys.
Based on recent diagnostic reports, the is generally defined as:
The engine failing to start or cutting out shortly after starting . Central locking malfunctions .
