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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 2.4L - DTC P0628 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0AC4: Hybrid/EV Powertrain Control Module Requested MIL Illumination >> Circuit/System Description

Circuit/System Description

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DTC P0AC4 is an informational DTC that indicates that the hybrid powertrain control module has set an emission related hybrid powertrain DTC. The engine control module (ECM) turns ON the malfunction indicator lamp (MIL) when the hybrid powertrain control module sends a serial data message requesting MIL illumination. When the ECM receives the message, DTC P0AC4 will set. The DTC information for the ECM will only display DTC P0AC4, but the freeze frame/failure records data may display the hybrid powertrain DTC that set.

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