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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 335 (Lighting System - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC B198F or B1990 >> Actions Taken When the DTC Sets

Actions Taken When the DTC Sets

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

DTC B198F 

The left rear stop lamp will be inoperative.

DTC B1990 

The right rear stop lamp will be inoperative.

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