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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Cellular, Entertainment, And Navigation - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Unable to Contact OnStar Call Center >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

B178C 11 

Short to ground on the primary cellular antenna signal circuit.

B178C 12 

Short to voltage on the primary cellular antenna signal circuit.

B178C 13 

Open on the primary cellular antenna signal circuit.

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