Network, generic

U0156 Lost Communication With Information Center A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Supply fuse of the unit missing or not fully seated (Mazda SA-040/24)
Infotainment unit internally faulty, for example memory chip (Volvo TJ 25872)
Infotainment software hangs or needs an update
Bus wiring or connector behind the dash faulty

Symptoms

  • 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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–1,500
Time0.2–3 h

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

Parts involved

information display modulecan bus wiring

Related codes

U0157U0457U0155U0158

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.