P0417 Secondary Air Injection System Switching Valve B Circuit Shorted

P0417 indicates a shorted Secondary Air Injection System Switching Valve B circuit. The controller detects current or voltage behavior outside the expected range for valve B.

Code details

Generic OBD-II · P0

System: Emissions
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not repeatedly clear P0417 or replace blown fuses without finding the shorted valve B circuit section.

Symptoms of P0417

Check-engine light, often with no obvious change in how the car drives.
A failed emissions test or incomplete readiness monitors.
Sometimes a faint fuel-vapour smell (on EVAP codes).

Common causes of P0417

A worn catalytic converter or an oxygen/air-fuel sensor reading out of range.
EVAP leaks — a loose or failed gas cap, cracked hose, or purge/vent valve.
Exhaust leaks, fuel-trim problems, or a fault in a related monitor.

Useful checks before replacing parts

Check valve B current draw, control voltage, fuse behavior, relay status, and whether the circuit is shorted to ground or voltage.
Inspect melted insulation, water intrusion, pinched wiring, failed solenoid windings, connector contamination, and harness contact with hot exhaust parts.
Isolate the valve from the harness and retest to determine whether the short is in the valve, wiring, relay, or module driver.

Related OBD-II codes

These nearby emissions entries can help compare wording and pin down the fault area.