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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Vehicle Access System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B15EC or B15ED >> Diagnostic Aids

Diagnostic Aids

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.

A short to ground on any signal circuit 4991 or 4992 may cause the driver information center to display "Service Door Latch System". The message will no longer display when the cause of the fault on the appropriate signal circuit has been repaired.

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