Fault Family
System: Body (B-Codes)
2 SAE Codes
ADAS Pedestrian Alert Speaker Circuit
Diagnostic & Technical Explanation
Code B0122 (Pedestrian Alert Speaker A) sets when the module cannot drive the exterior pedestrian alert speaker (used on hybrid/EV platforms to emit an audible warning at low speed) to its commanded output, or the speaker's circuit reads open, shorted, or draws current outside the expected range. Because the speaker is mounted in the front fascia or underbody, exposure to road spray, salt, and debris makes a corroded connector or a water-damaged speaker cone the most common causes. This is a pedestrian-safety feature rather than a driver convenience item, so the fault should not be deferred even though it does not affect vehicle drivability.
These 2 diagnostic trouble codes share one
detection mechanism and one repair path, which is why MechanicDB groups them into a single
authored fault family rather than repeating the same explanation 2 times.
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)