Network, generic

U0556 Invalid Data Received From Front Display Interface Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The front display interface module is the screen unit in the center of the dash; GM calls the matching node info display module (Saab 9-5 2011, U0255), Ford uses FDIM. The display mostly shows what other modules feed it. Ford examples: on the Escape (2016–2019) and Focus/C-Max (2016–2018) the FDIM ramps its backlight up and down in auto-dim mode, which looks like flicker but is normal (SSM 47748); on the 2020 Aviator the APIM configuration made the FDIM show the wrong number of radio presets (SSM 49092). U0556 is set by a receiver that gets FDIM frames, e.g. touch inputs or status, with implausible content; U0255 covers silence, U0558 the combined controls/display unit. No manufacturer documents U0556. Touch inputs may be ignored or the screen may act oddly.

Likely causes

Display module software fault or level not matching the infotainment unit
Wrong configuration of display or infotainment module after replacement or update
Front display module internally faulty (touch sensor or electronics)

Symptoms

  • Touchscreen does not respond or reacts to inputs that were not made
  • Wrong or incomplete content shown on the center display

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,100
Time0.5–2.5 h

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

Parts involved

front display interface module

Related codes

U0255U0558U0557

References: static.nhtsa.gov, static.nhtsa.gov, saabwisonline.com.