1. K10 Coolant Heater Control Module.
Service Part Name: Heater Coolant Heater.

2. T6 Power Inverter Module.
Service Part Name: Drive Motor Power Inverter Module.

3. Hybrid/EV Battery Assembly.
Service Part Name: High Voltage Battery.

4. S15 Manual Service Disconnect.
Service Part Name: Drive Motor Battery High Voltage Manual Disconnect Lever.

5. E54 Hybrid/EV Battery Pack Coolant Heater.
Service Part Name: High Voltage Battery Heater.

6. G1 A/C Compressor.
Service Part Name: Air Conditioning and Drive Motor Battery Cooling Compressor.

7. T18 Battery Charger.
Service Part Name: Drive Motor Battery Charger.

8. K1 14V Power Module.
Service Part Name: Accessory DC Power Control Module.

9. T24 Battery Charger-DC.
Service Part Name: High Voltage Battery Disconnect Control Module Assembly.

 

Electric Drive Transmission

 

The electronically-controlled, fully automatic transmission consists primarily of a 150kW drive motor, a differential/offset gear set, a high voltage electric auxiliary transmission fluid pump and housing, and two axles. (Fig. 8)

 

2017 Chevrolet Bolt EV drive unit

Fig. 8

 

The differential/offset gear set provides the fixed forward and reverse ratio. Changing speed and torque is fully automatic and is accomplished through the use of a drive motor generator power inverter control module located under the hood. The drive motor generator power inverter control module receives and monitors various electronic sensor inputs and uses this information to vary the torque output to the drive axles based on throttle position.

 

The lubrication system uses an electric auxiliary fluid pump motor assembly located outside of the transmission for lubrication of rotating components. The transmission fluid pump operates under low pressure and will only run when out of Park or Neutral and vehicle speed is detected.

 

Gear position is selected using the Electronic Precision Shift (EPS) system, which is also used on the new Buick LaCrosse and Cadillac XT5. The shift-by-wire systems sends electronic signals to the drive unit to select the drive mode. The selected gear position illuminates in red on top of the shift lever. After shifting, the lever returns to the center position.

 

TIP: The transmission will not stay in Neutral for an extended period. It will automatically shift into Park.