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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 (Data Communications - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC B2B12 or B2B13 >> Circuit/System Description

Circuit/System Description

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This diagnostic applies to internal microprocessor integrity conditions within the control module. The control module monitors its ability to read and write to the memory. No external circuits are involved.

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