U02B6Lost Communication With Rear Radar Module A
- Generic OBD-II code · Network
- How the car detects it
- Rear radar modules are hidden behind the bumper corners at the back and supply blind spot detection, which in its advanced form uses one sensor on each side, and rear cross traffic alert. U02B6 means rear radar A has stopped communicating. Stellantis cites the pair U02B6/U02B7 for the rear corner radars of the 2022-2023 Jeep Grand Cherokee, Wagoneer and Grand Wagoneer (GPOP 9100222, part 68629572): run the DTC test, then pin-unlock and swap the left and right radars and drive the car to calibrate them; if the fault stays on the same side after the swap, the wiring there is to blame. Which side is A is not stated there; on the 2026 Mercedes-Benz CLA electric, rear radar A is the outer left one. Blind spot warning on that side drops out.
- What you may notice
- Blind spot warning unavailable on one side
- Rear cross traffic alert off, assistance message
- Likely causes
- LikelyWiring or connector in the rear bumper damaged, e.g. after a parking knock or bumper repair
- PossibleRear radar A failed (confirmed when the fault follows a left/right swap)
- PossibleWater or corrosion in the radar connector
- 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.