U0554Invalid Data Received From Accessory Protocol Interface Module
- Generic OBD-II code · Network
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- LikelyOutdated or faulty SYNC/APIM software (often fixed by an over-the-air or dealer update)
- PossibleAPIM configuration not matching the vehicle equipment after replacement or update
- RareReceiving module (e.g. ABS) evaluating APIM data with outdated software
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.