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U05C0 Invalid Data Received From Interior Lighting Control Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Cars with extensive ambient and cabin lighting split it across several controllers; module B is the second of these, for instance for the rear cabin, the doors or a separate light strip, while A runs the main zone. These nodes usually hang on a LIN line below the body controller, which sends them colour and brightness commands and polls their status; Microchip's reference design runs this at about 10.4 kbit/s with a checksum on every frame. U05C0 is set when status replies from module B arrive but are corrupt or implausible, as opposed to U02BF, where B stops replying. No manufacturer documents U05C0 or the allocation of letter B. Expect zones that stay dark or show the wrong colour, while the main interior lights controlled by module A (U054B) keep working.

Likely causes

LED controller of lighting module B defective
LIN line or connector to module B damaged, for example in a door hinge area
Replacement module B not configured for its zone

Symptoms

  • Ambient light zone stays dark or flickers
  • Wrong colour or brightness in part of the cabin
  • Lighting settings in the menu not applied to all zones

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–500
Time0.3–2 h

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

Parts involved

interior lighting module b

Related codes

U02BFU054BU024A

References: http:, en.wikipedia.org, en.wikipedia.org.