U02B7Lost Communication With Rear Radar Module B
- Generic OBD-II code · Network
- How the car detects it
- U02B7 reports that rear radar B, the second corner unit at the back, has gone silent. Stellantis lists it together with U02B6 for the 2022-2023 Grand Cherokee and Wagoneer models in GPOP review 9100222 and relies on a side-to-side comparison: after a pin unlock the two rear corner radars are exchanged, so the fault either follows the sensor or stays on the harness side. A swapped or new radar must then be calibrated on a drive. Mercedes-Benz assigns rear radar B to the outer right position on the 2026 CLA electric, as its invalid-data code U05B855 shows. Since blind spot and cross traffic systems need both rear corners, a fault on one side usually disables the warning for that side, and some systems shut the whole function off.
- What you may notice
- Blind spot lamp on one side stays off or shows a fault
- Rear cross traffic alert unavailable
- Likely causes
- LikelyHarness or connector on the side of radar B damaged or loose
- PossibleRear radar B failed
- RareRadar replaced or swapped without completing the calibration drive
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.