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Home >> Chevrolet >> 2015 >> Volt >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L (LUU) - DTC P0449 To P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0AC4: Hybrid/EV Powertrain Control Module >> Circuit/System Description

Circuit/System Description

The hybrid/EV powertrain control module constantly monitors the hybrid/EV powertrain control system for any condition which may adversely affect vehicle emissions. If a condition is detected, the hybrid/EV powertrain control module sets a DTC and sends a serial data message to the engine control module (ECM). The ECM sets DTC P0AC4 to inform the technician that the hybrid/EV powertrain control module has set the emission related DTC. The serial data message sent by the hybrid/EV powertrain control module also contains a request for the ECM to illuminate the malfunction indicator lamp (MIL).

The technician can observe the DTC that was set by the hybrid/EV powertrain control module by reviewing the ECM Freeze Frame records on the scan tool. The ECM Freeze Frame records also contain the engine operating conditions present when the hybrid/EV powertrain control module DTC set.

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