Network, generic

U02B5 Lost Communication With Front Radar Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U02B5 is set when front radar B stops answering on the network. It is one of the few codes in this group with a public manufacturer case: on the 2022 Jeep Grand Wagoneer, Stellantis STAR case S2208000105 reports Active Driving Assist as not ready while the central ADAS module (CADM) holds U02B5, because connector D1082A of the front long-range radar (LRRF), mounted behind the bumper, was not fully latched; reseating and locking it cured the fault. At Stellantis, B therefore points to the long-range radar. Mercedes-Benz gives letter B to the right-hand outer radar at the front of the 2026 CLA electric, seen in its invalid-data partner U05B655. Adaptive cruise and the driving assistant stay off until the link returns; the engine is unaffected.

Likely causes

Radar connector not fully latched (Stellantis LRRF connector D1082A)
Wiring or radar damaged by a front impact or bumper work
Radar module B failed

Symptoms

  • Driving assistant reported as not ready
  • Adaptive cruise and forward collision warning off

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–2,000
Time0.3–3 h

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

Parts involved

front radar module bvehicle bus wiring

Related codes

U02B4U05B6U0235

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