B0123Pedestrian Alert Speaker B
- Generic OBD-II code · Body
- How the car detects it
- B0123 is the same check for pedestrian alert speaker B, which implies a second sounder. Ford's special service message 48451 for 2020 hybrids and plug-ins describes speakers at the front and the rear that sound in forward and reverse between 0 and 30 km/h. In the EU, Regulation 540/2014 made an acoustic vehicle alerting system compulsory on all new hybrid and electric vehicles from July 2021, sounding from start-up to about 20 km/h and when reversing. Stellantis records internal faults of its quiet vehicle pedestrian module as B2779-04, a maker-specific code rather than this one. No manufacturer links B0123 to a particular speaker in public; with B silent, one direction loses its warning and the legal sound requirement is no longer met.
- What you may notice
- Artificial sound missing at the front or rear, e.g. only audible when moving off forwards
- Possible warning message about the pedestrian alert system
- Legally required warning sound incomplete; have it repaired soon
- Likely causes
- LikelySpeaker B defective, for example from moisture in the rear bumper or wheel arch area
- PossibleLoose or corroded connector at speaker B or a rattling internal connector at the module
- RareFault in the sound generator module or its software
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.