eAssist Overview ; Note: THE REGENERATIVE BRAKING PROCESS REQUIRES UNIQUE TRANSMISSION ; Note: THE eASSIST FEATURES OF THE VEHICLE ARE ENABLED AFTER THE ENGINE - Page 18

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eAssist Overview 

(if equipped)

A compact electric drive system called eAssist has been integrated with the highly efficient 

2.4-liter four-cylinder engine and six-speed automatic transmission to provide an electric 

“boost” to help conserve fuel. eAssist includes a small, but powerful, electric motor rated at 

15 kilowatts. It replaces the typical alternator found on most engines. eAssist also uses a 

small, advanced 115-volt lithium-ion battery located in the trunk.

eAssist Features

Your Regal with eAssist has several features that increase vehicle efficiency and maximize 

fuel economy.

When braking or coasting, the electric motor acts like a generator to charge the high- 

voltage battery. This “regenerative braking” process captures kinetic energy that would 

otherwise be lost and stores it in the high-voltage battery. This electrical energy can then 

be reused.

Note: THE REGENERATIVE BRAKING PROCESS REQUIRES UNIQUE TRANSMISSION 

SHIFTING AS THE VEHICLE SLOWS DOWN.

When the vehicle comes to a stop, the engine may turn off automatically, saving fuel that 

would otherwise be used while idling. This is called an Auto Stop. The vehicle is powered 

by the high-voltage battery.

Note: THE eASSIST FEATURES OF THE VEHICLE ARE ENABLED AFTER THE ENGINE 

REACHES OPERATING TEMPERATURE.

Auto Start/Stop

While driving, when the brake is applied and the vehicle comes to a complete stop, the 

automatic engine start/stop system may turn off the engine, referred to as an Auto Stop. In 

Auto Stop mode, the tachometer gauge will read AUTO STOP. The audio system, climate 

controls and other accessories will be powered by the high-voltage battery. The engine will 

restart immediately when the brake pedal is released or the accelerator pedal is applied.

After parking the vehicle and turning off the engine using the key or START/STOP 

 button

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, the tachometer gauge will read OFF.

Auto Start/Stop Conditions

There are several conditions that may cause the engine to remain running or restart when 

the vehicle is stopped.

•  The engine, transmission or high voltage battery is not warmed up.

•  The outside temperature is less than –4°F (–20°C).

•  The shift lever is in any gear other than Drive (D).

•  The high-voltage battery state of charge is low.

•  The climate control system requires the engine to run based on the climate control or 

defog setting. Using the eco Air Conditioning mode will result in more frequent and 

 longer Auto Stops than the Comfort Air Conditioning mode.

•  The Auto Stop time is greater than two minutes.

See Driving and Operating in your Owner Manual.

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 Optional equipment