Body, generic

B0175 HVAC Recirculation Door Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The J2012 tables at hand leave out B0175, and no maker ties it to the recirculation door; a recirculation door circuit has the code B0273. Saab assigns the number to a temperature sensor instead. Its 9-3 climate control manuals read B0175 02 as a grounded left vent air mix temperature sensor, with the 2003 manual naming an input below 0.2 V, and the module then borrows the value of the left floor sensor; B0176 is its open circuit. GM's Global A system logs recirculation door actuator faults under B0223 and B022A instead. The recirculation door switches between fresh and cabin air, and HELLA notes that an air quality sensor can move it automatically. Check the make's definition first.

Likely causes

Recirculation door sticking or its actuator gear stripped
Saab 9-3: left vent air mix sensor or its lead shorted to ground
Actuator wiring or connector fault behind the glovebox

Symptoms

  • Recirculation cannot be switched or windows fog because the door stays on recirculate
  • Saab 9-3: left outlet temperature regulated less precisely

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–400
Time0.5–3 h

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

Parts involved

recirculation door actuatorhvac control module

Related codes

B0273B0173B0166

References: saabwisonline.com, saabwisonline.com, saabwisonline.com, hella.com.