U0693 code meaning
Lost Communication With Humidity Sensor
Network system Generic code U06xx codes Check engine light
What U0693 means
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.
U0693 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0693
- Check engine light after two trips
- Usually no noticeable drivability change
- Accompanying humidity or air-mass codes possible
Common causes of U0693
- Most likelyHumidity element in the air-mass meter contaminated or failed
- PossibleSignal or supply wire to the sensor faulty
- PossibleMoisture or corrosion in the connector
- Less likelyEngine controller software fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Humidity sensorVehicle bus wiring
What each part of U0693 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 93 | The exact fault in that area. |
What to do next
- Note U0693 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0693
What does U0693 mean?
U0693 means "Lost Communication With Humidity Sensor". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U0693?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U0693 fail an emissions test?
Yes, it can. U0693 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0693 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0693 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.