Powertrain, generic · Auxiliary emission controls

P0445 EVAP System Purge Control Valve A Circuit Shorted

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. P0445 is the short-circuit code of the older scheme for purge valve A, used by Saab's Trionic T7 and VW; GM reports shorts as P0458/P0459, Ford covers them in P0443. Saab checks with the low-side output switched on: the voltage should then be near 0 V, and above 2 V means the line is shorted to positive or the coil is shorted, with the driver in current limiting. The code sets after about 1 s; the driver protects itself by switching off, so purging stops.

Likely causes

Purge valve coil shorted (shorted turns)
Control wire shorted to positive (chafed)
Moisture or corrosion in the connector
Driver in the engine module

Symptoms

  • Check engine light on
  • Possibly fuel smell
  • EVAP monitors do not run

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–250
Time0.3–1 h

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

Parts involved

evap purge valvepurge valve wiringengine control module

Related codes

P0443P0444P0458P0459P0441

References: saabwisonline.com, static.nhtsa.gov, gsi.ext.gm.com.