U0253Lost Communication With Accessory Protocol Interface Module
- Generic OBD-II code · Network
- How the car detects it
- The accessory protocol interface module is Ford's SYNC computer (APIM), which connects touchscreen, phone and voice functions with the vehicle network. Other modules log U0253 when its frames stop arriving, and Ford bulletins show several listeners: the headlamp module of the 2017 Lincoln MKZ after a remote start, cured by new HCM software (SSM 46508); the FCIM switch panel of 2015-2017 F-150 trucks, which froze under heavy CAN load (SSM 46902); and the ABS module of the 2021 F-150 with U0253:00, an informational entry without symptoms that new ABS software removed (SSM 50290, 51329). Mach-E owners (2021-2023) saw the drive mode reset to normal while driving because of APIM software, and the ABS sometimes held U0253 as well (TSB 24-2012). Settings sent from the screen may be lost.
- What you may notice
- Center screen dark, frozen or rebooting
- Drive mode or settings fall back to default, message Drive Mode Not Available
- Code stored in ABS, headlamp or switch module without noticeable fault
- Likely causes
- LikelyAPIM or receiving-module software fault, fixed by reprogramming or over-the-air update
- PossibleAPIM without power or ground (fuse, connector behind the center display)
- PossibleNetwork overload or a module locking up after remote start or battery work
- RareInternal failure of the SYNC module
- 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.