OBD-II code · Network
U0693 Lost Communication With Humidity Sensor
The vehicle bus reports loss of communication with smart humidity sensor (intake air or cabin). Humidity-based fueling and HVAC strategies switch to a substitute value.
Is it safe to drive with U0693?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Humidity Sensor, Vehicle Bus Wiring
Related codes
- U0690Lost Communication With EGR Temperature Sensor D
- U0691Lost Communication With Exhaust Pressure Sensor A
- U0692Lost Communication With Exhaust Pressure Sensor B
- U0694Lost Communication With Hybrid/EV Battery Pack Coolant Pump A
- U0695Lost Communication With Hybrid/EV Battery Pack Coolant Pump B
- U0696Lost Communication With Particulate Filter Pressure Sensor C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.