OBD-II Fault Code

B2404: Audio Steering Wheel Switch Circuit Fault

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2404.

System family

Body

Generic/SAE

Repair category

Steering system

Use this category to narrow your checks before replacing parts.

Severity

High

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What B2404 usually means

Audio Steering Wheel Switch Circuit Fault.

Common symptoms

Body/accessory warning lamp or feature not working; Steering warning lamp or heavy/abnormal steering

Likely causes

Low voltage; Steering angle/torque sensor fault; Power steering motor/module issue; Wiring fault

Diagnostic checks

Check related fuses, connectors, grounds and switch/module power supply; Check battery/charging system; Calibrate steering angle sensor if required after repair/alignment

Repair guidance

Repair wiring/power supply, perform calibration, replace failed sensor/module after confirmation

Verification after repair

Operate the affected body/accessory system and rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary. A DTC identifies a circuit or system condition, not always the failed part.