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U0183 Lost Communication With Lighting Control Module - Rear A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0183 refers to rear lighting control module A, the unit that drives tail, brake, turn and in some designs reversing lamps at the back of the vehicle. A second rear unit, B, has U0252, the front module U0182. Such modules are found where LED rear lamps are switched and checked electronically, for example in a tailgate. No manufacturer documents U0183 publicly; neither GM's U-code list nor the NHTSA bulletin index carries it. GM's generic description for codes U0100-U02FF gives the trigger: an expected periodic message from the module goes missing while the system voltage is 9-16 V. Rear lamps may fail, fall back to a default pattern or raise a bulb warning. That matters for being seen, although no MIL is involved.

Likely causes

Rear lighting module without power or ground
Wiring broken in the tailgate or boot lid hinge loom
Corroded connector at the rear lamp or module
Rear lighting control module A faulty

Symptoms

  • Tail, brake or turn lamps at the rear not working
  • Bulb or lighting warning in the cluster
  • Rear lamps in a fixed default mode

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

rear lighting module acan bus wiring

Related codes

U0252U0484U0182U0180

References: saabwisonline.com, en.wikipedia.org.