Network, generic

U0445 Invalid Data Received From Body Control Module D

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0445 belongs to body control module D, a fourth controller for body functions that only vehicles with heavily distributed body electronics need. A receiver sets it when D's frames arrive but their content fails range, counter or checksum tests; complete silence from D is U0144. No manufacturer documents U0445 publicly, and no maker states what D controls. That several body units can coexist in one vehicle is shown by Ford, whose 2023 F-150 trailer module monitors both the main BCM and module C (TSB 24-2116). Because the role of a D unit differs by design, the symptom depends on what it handles, from one inoperative light or lock to warnings in the cluster. Diagnosis starts with the freeze frame in the reporting module and the supply and bus wiring of module D.

Likely causes

Software of module D or of the receiver not matching after an update
Damaged bus wiring or corroded connector on the branch to module D
Internal fault or poor supply at body control module D

Symptoms

  • A body function handled by module D works erratically or not at all
  • Warning messages in the instrument cluster

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€40–600
Time0.3–2 h

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

Parts involved

body control module dcan bus wiring

Related codes

U0144U0444U0446

References: static.nhtsa.gov, en.wikipedia.org.