B0122 code meaning
Pedestrian Alert Speaker A
What B0122 means
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.
B0122 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0122
- 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
Common causes of B0122
- Most likelySpeaker A failed from water, salt or stone impact at the front end
- PossibleOpen or short in the speaker wiring, often after bumper repairs
- Less likelyOutput stage of the sound generator module or its fuse faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pedestrian alert speaker aSpeaker wiringPedestrian alert control module
What each part of B0122 means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 22 | The exact fault in that area. |
What to do next
- Note B0122 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about B0122
What does B0122 mean?
B0122 means "Pedestrian Alert Speaker A". B0122 flags pedestrian alert speaker A. It is a generic code, so it means the same on every make.
Is it safe to drive with B0122?
B0122 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0122 fail an emissions test?
B0122 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is B0122 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will B0122 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.