Network, generic

U023E Lost Communication With Front Distance Range Sensor - Right

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U023E is the mirror image for the right front corner: the short range radar on the passenger side of the front bumper no longer delivers its object data. Together with the left unit (U023D) and the centre long range radar (U0235) it gives adaptive cruise and collision assistance a wider view of vehicles merging into the lane. Publicly only GM documents the code, in its 2025 OBD summary 25OBDG04B, where EOCM3 flags U023E after a gap of more than 0.20 s in any of the six right front radar bursts, with the usual exclusions for transport mode, resets and bus-off; adaptive cruise is then switched off and the code is classed Special Type C, so the MIL stays off. If U023D and U023E set together, look at a shared supply or bus. U043C covers invalid data.

Likely causes

Right front corner radar wiring damaged after collision or bumper removal
Supply or bus fault shared with the left corner radar
Right front corner radar faulty

Symptoms

  • Adaptive cruise control switched off
  • Driver assistance warning on the cluster

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–1,200
Time0.5–3 h

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

Parts involved

front distance sensor rcan bus

Related codes

U023DU0235U043C

References: gsi.ext.gm.com, en.wikipedia.org.