Network, generic

U0235 Lost Communication With Front Distance Range Sensor - Single Sensor or Center

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0235 means the forward long range radar, the single or centre sensor that measures the gap to traffic ahead for adaptive cruise and collision warning, has gone quiet. GM's 2025 OBD summary 25OBDG04B lets the object calculation module EOCM3 set it when any of six radar data bursts is absent for more than 0.25 s at 9-16 V, skipped in transport mode, after resets and during bus-off; adaptive cruise is then disabled and the code is Special Type C, so no MIL. GM PI PIC6606 (Cadillac Optiq 2025) reports Collision Alert or Driver Assist unavailable with a current U0235 and prescribes a BCM update plus a new long range radar after checking the wiring. Ford's 2014 list carries it without MIL. U023D/U023E are the corner sensors.

Likely causes

Radar connector or wiring at the front end damaged (often after a collision)
Weak 12 V supply or BCM calibration (GM PIC6606)
Long range radar module faulty
Fault on the object or chassis bus shared with other modules

Symptoms

  • Adaptive cruise control unavailable
  • Collision alert or driver assist unavailable message

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–2,000
Time0.5–3 h

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

Parts involved

acc radarcan bus wiring

Related codes

U023DU023EU0433

References: gsi.ext.gm.com, static.nhtsa.gov, performanceparts.ford.com.