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

P00F5 Humidity Sensor Circuit High

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. P00F5 means the signal is above its valid range (for example a duty cycle near 100 percent), typically from a sensor fault or a short to battery voltage.

Likely causes

Sensor or combined air flow sensor faulty
Signal wire shorted to battery voltage
Engine control module faulty

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

P00F2P00F3P00F4P00F6

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