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Hybrid Powertrain Control Module

Location 

The hybrid/EV powertrain control module 1 is a non-serviceable, flash-programmable micro-processor contained within the power inverter module.

Operating Functions 

The hybrid/EV powertrain control module 1 is the main controller of powertrain operation. The hybrid/EV powertrain control module 1 determines when to perform normal operating modes such as electric mode, extended range mode, and regenerative braking. The hybrid/EV powertrain control module 1 also operates in conjunction with the hybrid/EV powertrain control module 2 to determine when to enable and disable the DC high voltage circuits. Each motor control module operates the applicable motor based upon hybrid/EV powertrain control module 1 commands.

Communication and Hosted Diagnostics 

The hybrid/EV powertrain control module 1 is the host controller for DTC information for the following control modules:

These modules diagnose their own operation and determine when a fault condition is present. The 14V power module communicates diagnostic status to the hybrid/EV powertrain control module 1 over serial data.

All 3 motor control modules and the hybrid/EV powertrain control module 1 exchange information and commands on a serial peripheral interface bus internal communication circuit as well as the hi-speed hybrid GMLAN communication circuit.

In the event a hosted module communicates a fault condition, the hybrid/EV powertrain control module 1 will determine if one or more operating modes are affected and notify the vehicle operator by requesting the MIL illuminate and/or by displaying a message in the Driver Information Center. In addition, the hybrid/EV powertrain control module 1 will store the associated DTC information for retrieval by a scan tool. Some hosted modules may require an ignition cycle to clear certain DTCs from the hybrid/EV powertrain control module 1.

Circuit Inputs 

In addition to data parameters, the hybrid/EV powertrain control module 1 directly monitors the following signal circuits:

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