Powertrain, generic · Auxiliary emission controls

P0417 AIR System Switching Valve B Circuit Shorted

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The switching valve is the electrically driven valve of this path – a solenoid valve, or on Pierburg/VW systems an electric changeover valve that applies vacuum to the pneumatic combination valve; valve A serves the first path or bank 1, valve B the second. P0417 means the control circuit of valve B is shorted. As with valve A (P0414), a short to ground keeps the valve open, while a short to supply or a shorted coil overloads the driver, which is then often switched off for the rest of the trip. Subaru names P0417 for its two-valve system, with valve B on bank 2.

Likely causes

Coil of valve B with shorted turns (water ingress)
Wire chafed against ground or supply
Connector corroded
Engine module

Symptoms

  • Check engine light on
  • Secondary air inactive on bank 2
  • Secondary air readiness not set (emission test)
  • Driving normal

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–300
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

air switching valve bair combination valvevalve wiringengine control module

Related codes

P0415P0416P0414P2442P2443

References: static.nhtsa.gov, techtips.ie, law.cornell.edu.