P0AB9 CHEVROLET – Hybrid System Performance

P0AB9 CHEVROLET Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0AB9 CHEVROLET Possible Causes

Faulty Starter Generator Control Module,Starter Generator Control Module harness is open or shorted,Starter Generator Control Module circuit poor electrical connection

P0AB9 CHEVROLET Description

The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module. The eAssist hybrid system has the ability to crank and start the engine using two different methods. The first method is a conventional 12 volt system. On every initial start up the conventional 12 volt starter and 12 volt battery are used to crank and start the engine. The second starting method uses both the 115 Volt generator control and battery assembly, also called the hybrid EV battery pack, and the starter generator, also called the drive motor. The drive motor is a 3 phase AC induction machine. This device not only serves as a 115-volt AC generator, it is also used to provide engine power assist and to start the engine when in auto-stop mode. If the system is in the auto-stop mode and fails to restart with the drive motor, the 12 volt conventional starter will automatically be engaged to start the engine. The drive motor can quickly rotate the engine to operating speed (800 RPM). The hybrid powertrain control module can detect a condition where the engine is stalling and command the drive motor to rotate the engine to prevent a stall.