Powertrain, generic · Fuel and air metering, auxiliary emission controls

P00F6 Humidity Sensor Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The humidity sensor measures the relative humidity of the intake air; on documented vehicles it is built into the mass air flow sensor or a combined sensor. The engine control module uses the value, for example, to correct torque and in emission models. One documented design is capacitive and reports humidity as a pulsed signal with a duty cycle that the control module converts back. P00F6 is set when the signal jumps implausibly within a short time, which typically points to a loose contact.

Likely causes

Loose contact
Sensor faulty
Interference on the signal wire

Symptoms

  • Check engine light on
  • Usually no noticeable symptoms
  • Slightly uneven torque or higher consumption possible

Repair estimate

DifficultyEasyDIY possible
Parts and labour€80–450
Time0.3–1 h

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

Parts involved

humidity sensormass air flow sensorhumidity sensor wiring

Related codes

P00F2P00F3P00F4P00F5

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.