Network, generic

U0339 Software Incompatibility With Body Control Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Body control module B is a second body controller that takes over part of the switching, for example in a rear or auxiliary junction box. U0339 means a partner module rejects its software or setup; U0331 covers unit A, U0322 vehicles with a single body controller. Jaguar uses exactly this name: on the 2010 XF 5.0 V8 and the 2010–2011 XK, the auxiliary junction box, listed as body control module B, could drop the fuel pump relay after start, so the engine stalled once the high-pressure pump ran short; recall J017 loaded revised software and reconfigured that box. Ford has a BCM-B on 2022–2023 Mustang Stealth models, where a wrong configuration left the sill plates dark until program 23B60 reconfigured it with FDRS. U0142 is lost contact, U0443 invalid data. Usually no MIL.

Likely causes

Body control module B carries a configuration that does not match the vehicle
Unit B left on an older software level after an update campaign
Auxiliary junction box replaced without programming

Symptoms

  • Functions switched by the second body module fail, such as lights or sill plate illumination
  • Depending on its tasks, engine may stall or not start
  • Network codes in several modules after body module work

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–800
Time0.3–2 h

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

Parts involved

body control module b

Related codes

U0142U0443U0331U0322

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