U0235

Lost Communication With Front Distance Range Sensor - Single Sensor or Center

Q: 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.

Q: 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.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear U0235 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX