Network, generic

U055C Invalid Data Received From Special Purpose Vehicle Control Module C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

With U055C a module rejects the content of messages sent by special purpose controller C, the third of four slots for conversion electronics. No maker publishes a code-specific description. Ford's body builder bulletin for the 2023 Super Duty points to a typical pitfall: the factory interface module, the infotainment unit and the body control module all need matching software before the upfitter tool can talk to them, and trucks built before a June 2023 cut-off require a reflash. Out-of-step software on either side therefore produces data the receiver cannot accept. Diagnosis starts with the conversion paperwork and software levels rather than with the vehicle's own modules. U025B covers total silence of controller C.

Likely causes

Software levels of conversion controller and vehicle modules out of step
Conversion equipment added or changed without updating controller C
Damaged bus wiring in the conversion harness

Symptoms

  • Functions controlled by the conversion do not respond as configured
  • Code appears after a software update or conversion work

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–500
Time0.5–2.5 h

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

Parts involved

special purpose vehicle module c

Related codes

U025BU055AU055BU055D

References: content.fordpro.com, fordservicecontent.com.