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Home >> Cadillac >> 2014 >> Escalade ESV Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1821: Lost Communication With DC to DC Converter Control Module A on Bus B >> Diagnostic Aids

Diagnostic Aids

Different DTCs may set in different modules along with this DTC depending on where the fault occurs and the vehicle operating conditions when the fault occurs.

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