U0235
Lost Communication With Front Distance Range Sensor - Single Sensor or Center
Communication network
Generic OBD-II
Medium
What it means
U0235 means the network has lost communication with the front distance range sensor — the forward-looking radar used for adaptive cruise control and forward-collision warning/automatic braking. The engine and brakes work normally, but those driver-assist features are disabled until communication is restored.
Medium
Can I keep driving? Yes to drive, but with care — adaptive cruise control and forward-collision/auto-brake features are disabled, so use normal cruise and keep extra following distance.
Common symptoms
What you'll notice
- Adaptive cruise control and forward-collision warning stops working or shows a 'system unavailable' message
- A warning light for the feature (or the check-engine light) comes on
- Adaptive cruise control and collision-warning/auto-brake are unavailable
- A 'front sensor blocked/unavailable' message may appear
- The affected module doesn't respond on a full-system scan
Common causes
Most likely first
- Damaged wiring or a loose/corroded connector at the module (behind the front grille/bumper)Likely
- Loss of power or ground to the moduleCommon
- A CAN bus fault (open, short, or high resistance) on that circuitCommon
- Water intrusion or corrosion at the module or its connectorLess often
- Failed module (least common — rule out wiring and power first)Less often
How to diagnose & fix
Work through it in order
- Scan all modules and note exactly which one reports the code to locate the affected segment.
- Inspect the wiring and connector at the module (behind the front grille/bumper) for damage, chafing, or corrosion.
- Check power and ground to the module with the connector loaded.
- Test the CAN bus circuits to the module for opens, shorts, or high resistance.
- If wiring and power test good, suspect the module itself. Repair and re-test.
FAQ
Quick answers
Is it safe to drive with U0235?+
Mechanically yes — the engine and transmission are unaffected. But adaptive cruise control and forward-collision warning won't work, so don't rely on it and get the wiring checked.
Can I just clear U0235?+
You can, but if the module is still off the bus the code returns within a few drive cycles. Fix the wiring or power fault first.
Related codes
Often seen with U0235
Read & clear U0235 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