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U02B6 Lost Communication With Rear Radar Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Wiring or connector in the rear bumper damaged, e.g. after a parking knock or bumper repair
Rear radar A failed (confirmed when the fault follows a left/right swap)
Water or corrosion in the radar connector

Symptoms

  • Blind spot warning unavailable on one side
  • Rear cross traffic alert off, assistance message

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–1,500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

rear radar module avehicle bus wiring

Related codes

U02B7U02B8U02B9U05B7U0232

References: static.nhtsa.gov, static.nhtsa.gov, bosch-mobility.com.