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U05B6 Invalid Data Received From Front Radar Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Letter B on a front radar points to different hardware depending on the brand. At Mercedes-Benz, U05B655 on the 2026 CLA electric marks implausible data from the front radar on the outer right, again with sub-code 55 for a sensor that was never configured, and it shares the remedy of the left unit: calibrating control unit N62/5 per LI54.71-P-080345. Stellantis gives B to the long-range radar behind the front bumper: on the Grand Wagoneer, lost communication U02B5 in the central ADAS module came from connector D1082A not being latched (STAR S2208000105). U05B6 itself means that module B keeps talking while its object or status data are rejected. Adaptive cruise, collision warning and lane centring then go offline; the engine lamp stays dark.

Likely causes

Right front radar not configured after production or replacement (Mercedes)
Long-range radar connector not fully latched (Stellantis D1082A)
Radar cover dirty, iced or damaged
Radar module internally defective

Symptoms

  • Adaptive cruise control not available
  • Forward collision warning switched off
  • Lane centring or active driving assist not ready

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–2,000
Time0.3–3 h

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

Parts involved

front radar module b

Related codes

U02B5U05B5U0433

References: static.nhtsa.gov, static.nhtsa.gov.