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Home >> Chevrolet >> 2017 >> Volt Premier >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Data Communication System - DTC U1817 To DTC U3012 And Scan Tool Symptoms >> Diagnostic Information and Procedures >> DTC U1845 or U1846: Drive Motor Control Module Lost Communication with Hybrid Powertrain Control Module >> Circuit/System Description

Circuit/System Description

The Motor Control Modules and the Hybrid Powertrain Control Module 1 are all internal to the Power Inverter Module. The Motor Control Modules communicate only with the Hybrid Powertrain Control Module 1 with the Hybrid Powertrain Control Module 1 sending out diagnostic trouble code information to other devices regarding the Motor Control Modules. All circuits to the Hybrid Powertrain Control Module 1 and Motor Control Modules are also internal to the Power Inverter Module and replaced as a single component.

Communication diagnostics for the serial data, including device power and ground as well as the wakeup circuits for Motor Control Modules and the Hybrid Powertrain Control Module 1 are all diagnosed from external sources only to the Power Inverter Module connector because any circuit fault condition within the Power Inverter Module will cause a complete replacement.

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