OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Body generic / SAE

B0122

Pedestrian Alert Speaker A

Fault on pedestrian alert speaker A — emits an artificial driving sound at low speed on EVs/hybrids (legally required, e.g. UNECE R138, FMVSS 141).

SystemBody
Typegeneric / SAE
GroupB0
Range / number1 / 22

Possible causes

  • Speaker coil open high

Symptoms

  • Warning light or symbol related to the affected system
  • Comfort or safety function impaired

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 100–800 €
  • Estimated time: 0.5–3 h
  • Component: pedestrian alert speaker a
  • Component: speaker wiring
  • MIL / check engine light

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication