Network, generic

U025B Lost Communication With Special Purpose Vehicle Control Module C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

With U025B a module on the bus reports that controller C (third slot of four) has gone quiet. No manufacturer documents this code publicly. Ford's body builder bulletin for its 2023 Super Duty shows a pitfall that applies to all slots: the Upfitter Integration System module only cooperates with the programming tool when it, the SYNC module and the body control module carry matching software, and trucks built before 12 June 2023 need a reflash first. A partly updated set can therefore leave an add-on unit unanswered. The Audi patent on configurable conversion modules adds that such units may hang on CAN, LIN or other links, so the missing node is not always on the main bus. Check software levels and the conversion paperwork before replacing hardware. Base vehicle functions normally remain; U055C means corrupt data.

Likely causes

Software of vehicle modules and add-on unit not at matching levels
Controller C without power or ground from the upfit circuits
Fault on the sub-bus or link through which the unit is attached
Internal failure of controller C

Symptoms

  • Conversion functions of unit C inoperative
  • Programming or configuration tool cannot reach the unit

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–700
Time0.5–3 h

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

Parts involved

special purpose vehicle module cvehicle bus wiring

Related codes

U055CU0259U025AU025C

References: content.fordpro.com, patents.google.com.