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GMC TSB #PIT5949

2023 GMC Yukon

Summary: This Preliminary information communicates an issue duringÂ start up thatÂ theÂ following symptoms occur: - Service Safety Restraints System Message - Sunroof Inoperative - Sunshade Lights Inoperative - Dome Lights Inoperative - Power Liftgate Inoperative when using switch in overhead console -Â DTCsÂ U1121 set in the BCM and B1A7A set in the Restraints Module Engineering is currently working on a fix and in the meantime a customer can cycle the dome light switchÂ on/off to correct the condition during that ignition cycle.

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