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Home >> Buick >> 2017 >> Envision Base >> Repair and Diagnosis >> Electrical >> Body Electrical >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC P156D: DC/DC Converter Ignition Switch Run/Start Position Signal Message Counter Incorrect >> Circuit/System Description
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Circuit/System Description

The DC/DC converter provides continuous power to certain devices during a stop start event to achieve uninterrupted performance during engine cranking. The ECM monitors the ignition status of the DC/DC converter during start stop events.

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