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Home >> Cadillac >> 2017 >> CTS Base, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U183A: Lost Communication with Telematics Communication Interface Control Module on High Speed CAN Bus >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ U183A U183A - -
Ignition U183A U183A - -
Gateway Isolated High Speed GMLAN Serial Data (+)
or High Speed GMLAN Serial Data (+) (9)		 U007C U183A U007C -
Gateway Isolated High Speed GMLAN Serial Data (-)
or High Speed GMLAN Serial Data (-) (9)		 U007C U183A U007C -
Ground - U183A - -
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