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U05B7 Invalid Data Received From Rear Radar Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Rear radar modules are hidden in the corners of the rear bumper and feed blind spot warning, rear cross traffic alert and the exit warning that watches for cyclists when a door opens. Mercedes-Benz stores U05B755 on the 2026 CLA electric when the rear radar on the outer left sends implausible data because it is not configured; the driver assistance controller N62/5 then keeps several functions offline. Bulletin LI54.71-P-080345 (versions 1 and 2) has the N62/5 calibrated by teach-in, or alternatively by the calibration drive used after a bumper has been replaced. U05B7 thus points to a sensor that answers but is not accepted, unlike U02B6, where it no longer answers at all. Drivers notice a missing blind spot lamp on the left and assistance messages; driveability is unchanged.

Likely causes

Left rear radar not configured in the assistance controller
Rear bumper repaired or repainted, sensor mount or cover altered
Moisture or corrosion at the rear radar connector

Symptoms

  • Blind spot indicator on the left stays off
  • Rear cross traffic and exit warnings unavailable
  • Assistance unavailable message in the instrument cluster

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time0.5–3 h

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

Parts involved

rear radar module a

Related codes

U02B6U05B8U05B9U05BAU0533

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