Network, generic

U0557 Invalid Data Received From Front Controls Interface Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Front controls interface module A is the button panel in the center stack that reads keys and knobs for audio and climate and passes them on as bus messages; Ford calls it FCIM, GM the infotainment faceplate control module (Saab 9-5 2011, U0256). Ford shows how much depends on it: on 2015–2017 F-150 trucks heavy CAN traffic could freeze the FCIM, so A/C, radio and even window switch control failed intermittently with U0140, U0155, U0253, U0401 or U0452 in the FCIM; a battery reset and FCIM self-test came before any replacement (SSM 46902). U0557 stands for panel frames that arrive with invalid content, U0256 for absent ones, U055E for the second panel B. No bulletin cites U0557. Button presses may be ignored or trigger the wrong function.

Likely causes

Control panel electronics locking up under high bus load
Control panel software fault or mismatch with the infotainment unit
Stuck button or liquid spilled into the panel producing invalid key states
Front controls interface module A internally faulty

Symptoms

  • Radio or climate buttons work only intermittently or not at all
  • Several warning lamps or messages appear together with the button failure

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–800
Time0.3–2 h

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

Parts involved

front controls interface module a

Related codes

U0256U055EU0558

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