B0122Pedestrian Alert Speaker A
- Generic OBD-II code · Body
- How the car detects it
- B0122 flags pedestrian alert speaker A. Hybrid and electric vehicles are almost silent at walking pace, so they have to make an artificial sound. In the US, FMVSS 141 covers such vehicles up to 4,536 kg GVWR and sets minimum sound levels when stationary with propulsion active, in reverse and up to 30 km/h. GM's preliminary information PIC6478 for the 2023 Cadillac Lyriq shows a typical front speaker behind the bumper: it plays from standstill to about 25 mph, can be silenced for diagnosis by pulling fuse F46UA, and its bracket may buzz against the bumper beam. Which speaker is A is not published, and no maker documents B0122. With the speaker dead the car loses its mandatory warning sound but drives normally.
- What you may notice
- No artificial driving sound at low speed from the affected side
- Warning message about the pedestrian alert system in the cluster, depending on make
- Vehicle no longer meets the legal minimum sound; repair promptly
- Likely causes
- LikelySpeaker A failed from water, salt or stone impact at the front end
- PossibleOpen or short in the speaker wiring, often after bumper repairs
- RareOutput stage of the sound generator module or its fuse faulty
- 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.