U023DLost Communication With Front Distance Range Sensor - Left
- Generic OBD-II code · Network
- How the car detects it
- U023D means the left front distance range sensor, a short range corner radar that watches the area ahead and to the left of the bumper, has stopped reporting. Corner radars widen the field of view of the central long range radar, which helps adaptive cruise pick up cutting-in traffic. GM's 2025 summary 25OBDG04B is the only public manufacturer record: EOCM3 sets U023D when any of six left front radar bursts is missing for more than 0.20 s at 9-16 V, not in transport mode, not right after a reset and not during bus-off; adaptive cruise is disabled, Special Type C, no MIL. A crash repair or bumper work near the left headlamp is the usual suspect. U0235 is the centre sensor, U023E the right one, U043B invalid data.
- What you may notice
- Adaptive cruise control unavailable
- Front cross traffic or collision assist limited
- Likely causes
- LikelyConnector or harness at the left front corner damaged (collision, bumper work)
- PossibleRoad salt corrosion at the radar plug
- RareLeft front corner radar faulty
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.