Network, generic

U0180 Lost Communication With Automatic Lighting Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0180 belongs to the automatic lighting control module, the unit that evaluates a light sensor and switches the headlamps on at dusk, in tunnels or with the wipers. Once it is silent, the auto-light feature can no longer be commanded. The only public bulletin found comes from GM and fits poorly: PIE0348 and PIE0348A (Cadillac ATS 2013-2016, CTS 2014-2016 with premium amplifier) tie U0180 or B1325 to lost audio, chimes and turn-signal clicks, sometimes after rain or a car wash, without naming the module, so GM's use may differ from the J2012 name. Expect the lights to stay in manual mode or default to on; no MIL. U0181 and U0182 are the levelling and front lighting modules, U0481 invalid data.

Likely causes

Light sensor or lighting module without power or ground
Moisture at connectors after rain or car wash (GM PIE0348)
Bus or LIN line to the windscreen sensor damaged
Automatic lighting module faulty

Symptoms

  • Automatic headlamps no longer switch on or off
  • Headlamps stay on as a default
  • GM Cadillac: no audio, chimes or turn-signal sound

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–700
Time0.5–3 h

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

Parts involved

automatic lighting modulecan bus wiring

Related codes

U0481U0181U0182U0183U0140

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