Network, generic

U0331 Software Incompatibility With Body Control Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Body control module A is the first of several body controllers on vehicles that spread lighting, locking, wipers and power distribution over more than one unit. With a single body controller the same mismatch is reported as U0322; U0339 covers unit B. U0331 means a partner module finds the software or configuration of unit A unfit. No manufacturer documents U0331 publicly, and none reveals which controller is labelled A. Jaguar calls its auxiliary junction box body control module B (recall J017), leaving the central junction box as the leading body unit; on 2016–2017 XF models that would not start with both smart keys inside, Jaguar reconfigured that box to the latest level (K424). Ford cured failed BCM installations on many 2016–2017 models with a newer IDS release (SSM 50097). Body functions may fail; no MIL.

Likely causes

Body control module A replaced without loading the vehicle configuration
Programming aborted or corrupted by an outdated diagnostic tool release
Other body modules updated while unit A stayed on its old level

Symptoms

  • Lighting, locking or wiper functions fail or behave oddly
  • Keyless start or remote locking may not work
  • Several modules store network codes after body module work

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–900
Time0.3–2 h

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

Parts involved

body control module a

Related codes

U0141U0339U0322U0422

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