Network, generic

U0232 Lost Communication With Side Obstacle Detection Control Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0232 means side obstacle detection control module A, one of the rear corner radars for blind spot and cross traffic warning, is missing from the network. Saab's 2011 list puts A on the left; Toyota bulletin T-SB-0063-19 (Tacoma 2016-2018) calls U0232 loss of the blind spot slave module. Volvo journal TJ 30858 (XC90, S90, 2016-2018) has the right unit log U023292 for its partner and prescribes new software. Ford TSB 24-2180 (Expedition, Navigator 2022-2024) finds U0232 in the IPMA when mud, snow or ice packs behind the bumper and adds shields. A Chrysler STAR case (Durango 2020) traced it to an open fuse 95 and a pinched circuit in the liftgate. Blind spot alerts go dark; no MIL.

Likely causes

Mud, snow or ice packed between radar and bumper cover
Radar module software needing update
Open fuse or pinched wiring in the rear body or liftgate
Corroded radar connector

Symptoms

  • Blind spot system unavailable message
  • Mirror warning lamps do not light
  • Rear cross traffic alert inoperative

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–900
Time0.3–3 h

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

Parts involved

blind spot module leftcan bus wiring

Related codes

U0233U0533U024E

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