U0693Lost Communication With Humidity Sensor
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Intake air humidity influences combustion temperature and NOx, so some engines measure it, usually with a capacitive element built into the air-mass meter; Bosch offers such meters with optional humidity sensing over SENT, FAS or LIN. GM's dual-throttle tables 23OBDG07/24OBDG07 use U0693 for a SENT humidity sensor on bank 1, stored when the sensor itself reports a maximum or minimum error for 1 s, MIL after two trips; the same program has P00F4 to P00F6 for the reading and GM codes for invalid data. Other layouts avoid U0693: GM's 25OBDG04A treats a silent LIN air-mass meter as U060F, and Ford's 2023 diesel sets P00F2 for bad SENT humidity message timing. Fuel and EGR then run on default humidity.
- What you may notice
- Check engine light after two trips
- Usually no noticeable drivability change
- Accompanying humidity or air-mass codes possible
- Likely causes
- LikelyHumidity element in the air-mass meter contaminated or failed
- PossibleSignal or supply wire to the sensor faulty
- PossibleMoisture or corrosion in the connector
- RareEngine controller software fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.