Body
Generic/SAE
OBD-II Fault Code
B2479: BRAKE PARK SWITCH CIRCUIT SHORT TO GROUND
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2479.
ABS / brake system
Use this category to narrow your checks before replacing parts.
High
Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.
What B2479 usually means
BRAKE PARK SWITCH CIRCUIT SHORT TO GROUND.
Common symptoms
Body/accessory warning lamp or feature not working; ABS/traction light, ABS disabled, possible speedometer or stability-control issues
Likely causes
Dirty/damaged wheel speed sensor; Damaged tone ring/bearing; Wiring fault; ABS pump/module issue; Wire shorted to chassis/ground; Internal component short
Diagnostic checks
Check related fuses, connectors, grounds and switch/module power supply; Inspect wheel speed sensor wiring and tone ring; Compare live wheel speed data while spinning wheels safely; Inspect harness for rubbing/pinch points and check resistance to ground
Repair guidance
Repair sensor wiring or replace failed sensor/bearing/tone ring; Diagnose pump/module only after sensor circuits pass; Repair insulation/harness damage or replace internally shorted component
Verification after repair
Operate the affected body/accessory system and rescan