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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U1818 >> Diagnostic Information and Procedures >> DTC P23A9: Communication Fault - Forced Engine Shutdown >> Circuit/System Description
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Circuit/System Description

When Engine Control Module detects a loss of CAN or Transmission Control Module communication, it will command an engine shutdown to avoid an unintended acceleration during low vehicle speed.