U0156Lost Communication With Information Center A
- Generic OBD-II code · Network
- How the car detects it
- U0156 concerns information center A, the display and infotainment unit that shows messages, audio, navigation or vehicle settings. Two makers document the code. Mazda calls the partner the connectivity master unit, its infotainment head unit: on 2019-20 Mazda3 and CX-30 the vehicle and body controllers store U0156:00 with an in-vehicle network malfunction message (SA-029/20), and on 2024-25 CX-90 and CX-70 the engine controller logs it alongside a blank center screen, dark interior lights and a start only with the key held near the button, because the 25 A fuse F1 removed for transport was not fully seated (SA-040/24). Volvo's central electronic module sets U015600 on 2011-15 S60, S80, XC60 and XC70 when the Sensus screen stays black after a memory chip fault (TJ 25872). U0157 is center B, U0457 invalid data from A.
- What you may notice
- Center display black, no audio or navigation
- Network malfunction or several warning messages in the cluster
- Climate or vehicle settings that run through the screen unavailable
- Likely causes
- LikelySupply fuse of the unit missing or not fully seated (Mazda SA-040/24)
- PossibleInfotainment unit internally faulty, for example memory chip (Volvo TJ 25872)
- PossibleInfotainment software hangs or needs an update
- RareBus wiring or connector behind the dash faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.