Body, generic

B0268 HVAC Mode Door 1 Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0268 is not in the published J2012 lists, but General Motors uses the number: bulletin PIP5094, written for 2014 and older GM cars and light trucks, includes it in its keyword list of body codes, without a descriptor. The mode door routes air to face vents, footwell or windscreen. GM's later Global A system files the mode actuator under B0233; B0150 and B0170 also exist for this door. Such actuators are often a DC motor with a geared potentiometer returning about 0 to 5 V, per MOTOR magazine; newer ones count commutator pulses instead. In Nissan Shatai's patent US4819715A one actuator sets a shutter to open the upper vents, the defroster or neither. A circuit fault leaves the door in its last position.

Likely causes

Mode door actuator motor or position feedback failed
Actuator over-travelling or binding at the door, overloading its drive
Actuator plug or wiring behind the dash open or shorted

Symptoms

  • Air stays on one outlet, for example defrost, whatever mode is chosen
  • Pressing the mode button no longer changes where the air comes out

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–500
Time1–4 h

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

Parts involved

hvac mode actuatorhvac control module

Related codes

B0150B0170B0233B0278

References: static.nhtsa.gov, motor.com, patents.google.com, saabwisonline.com.