U0231
Lost Communication With Rain Sensing Module
Body / comfort network
Generic OBD-II
Low
What it means
U0231 means the car has lost communication with the rain sensing module — the sensor at the windshield that switches on the wipers automatically when it detects rain. Automatic wipers stop working, but you can still operate the wipers manually, so it doesn't compromise how the car drives.
Low
Can I keep driving? Yes — the car drives normally and the wipers still work manually; only the automatic rain-sensing mode is disabled.
Common symptoms
What you'll notice
- Automatic wipers no longer respond to rain
- Auto wiper setting is missing, greyed out, or ignored
- Wipers behave erratically in auto mode
- Warning message about the rain sensor or auto wipers
Common causes
Most likely first
- Failed rain sensor module (mounted at the windshield behind the mirror)Likely
- Wiring or connector fault at the sensorCommon
- Poor gel-pad contact or moisture behind the sensor, often after a windshield replacementCommon
- Fault in the body or wiper control moduleLess often
- Damaged network (bus) wiring to the sensorLess often
How to diagnose & fix
Work through it in order
- Scan modules and confirm the rain sensor is not reporting.
- Check the sensor connector behind the mirror for seating and corrosion.
- Inspect the wiring to the sensor.
- If the windshield was recently replaced, verify the sensor's gel pad and mounting.
- Replace the rain sensor module if faulty — manual wipers keep working meanwhile. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with U0231?+
Yes. The wipers still work in manual and intermittent modes; only automatic rain-sensing is lost. Just switch the wipers on yourself in the rain.
Can I just clear U0231?+
You can, but it returns unless the sensor or its wiring is repaired.
Related codes
Often seen with U0231
Read & clear U0231 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX