Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
The cost to diagnose the P0AB9 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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.
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