What it means
The humidity sensor reading is outside the expected range or does not behave as expected.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The humidity sensor measures moisture in the air and provides a reading used by the control module for related system decisions. This code sets when the reading is outside the expected range or fails to respond as expected, which may reflect sensor drift or poor sensor mounting.
Common causes
Most likely first.
- Sensor reading drifted
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- Check-engine light on
- Automatic climate control may work less accurately
- Windshield may fog more easily
How to diagnose it
- Review freeze-frame data and compare the humidity reading with current cabin or outside conditions and any related climate-control data available on the scan tool.
- Inspect the humidity sensor mounting to ensure it is seated as designed and exposed to the intended air path.
- Check the sensor connector and wiring for loose contact, corrosion, or damage that could distort the reading.
- Observe whether the humidity value changes plausibly as conditions change, following the vehicle's diagnostic information.
- Test the sensor output and mounting against the manufacturer's specification before replacing components.
Common fixes
- Secure the humidity sensor in its intended mounting position.
- Repair poor connector contact or damaged wiring.
- Replace the humidity sensor if its reading is confirmed to have drifted or fail the specified test.
Can I keep driving?
You can generally continue driving, but automatic climate control may manage moisture less accurately and the windshield may fog more easily. Clear fogged glass before moving and pull over if visibility is reduced.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.