Network, generic

U0554 Invalid Data Received From Accessory Protocol Interface Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Accessory protocol interface module is Ford's name for the SYNC computer (APIM), which, at least in the first SYNC generation, sits apart from the audio control module and talks to the high- and medium-speed CAN buses. Because the touchscreen sends drive mode, settings and configuration through it, wrong APIM data reach far: on the 2021–2023 Mustang Mach-E, APIM software let the drive mode fall back to normal with Drive Mode Not Available, partly with U0253 in the ABS (TSB 24-2012); on the 2020 Aviator a misconfigured APIM made the display show a wrong number of radio presets (SSM 49092). U0554 stands for APIM frames that arrive but are rejected; U0253 marks missing frames and U031F a software mismatch. No bulletin cites U0554 itself. Settings made on the screen may not take effect.

Likely causes

Outdated or faulty SYNC/APIM software (often fixed by an over-the-air or dealer update)
APIM configuration not matching the vehicle equipment after replacement or update
Receiving module (e.g. ABS) evaluating APIM data with outdated software

Symptoms

  • Drive mode or vehicle settings chosen on the touchscreen are not applied or fall back
  • Wrong or incomplete information on the center display
  • Code stored in another module without noticeable fault

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,200
Time0.5–2.5 h

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

Parts involved

accessory protocol interface module

Related codes

U0253U031F

References: en.wikipedia.org, static.nhtsa.gov, static.nhtsa.gov.