U043BInvalid Data Received From Front Distance Range Sensor - Left
- Generic OBD-II code · Network
- How the car detects it
- U043B covers the left front distance sensor, usually a short-range corner radar that widens the view of adaptive cruise and collision assistance beyond the central long-range unit; that one has U0433, the right corner U043C. A receiver sets U043B when the left sensor's object or status frames arrive but fail plausibility or protection checks. No manufacturer documents U043B publicly. GM's 2025 EOCM3 tables list only the lost-contact partner U023D for the left front short-range radar: frames absent longer than 0.2 s end adaptive cruise (special Type C), which indicates how the assistance controller is likely to react to corrupted data as well. Expect assistance features reduced or switched off and a prompt to clean or check the sensor area.
- What you may notice
- Adaptive cruise or lane change assistance unavailable
- Message to clean or check front sensors
- Likely causes
- PossibleLeft corner radar misaligned or damaged after a bumper impact
- PossibleCorner radar software not matching the assistance controller
- RareMoisture or corrosion in the left sensor connector
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.