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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 191 (Data Communications - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC U1982-U1984 >> DTC Descriptor

DTC Descriptor

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.
DTC U1982

Serial Data Gateway Module Message Authentication Keys Missing or Incomplete

DTC U1983

Serial Data Gateway Module Security Hardware Internal Malfunction

DTC U1984

Serial Data Gateway Module Unable to Authenticate Serial Data Message

For symptom byte information, refer to Symptom Byte List .

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