Jeep 2015 Grand Cherokee SRT - Owner Manual - Manual (Page 409)

When the Fuel Economy (ECO) Mode is engaged, the
vehicle control systems will change the following:
• The transmission will upshift sooner and downshift
later.
• The transmission will launch (from a stop) in second
gear.
• The torque converter clutch may engage at lower
engine speeds and remain on longer.
• The engine idle speed will be lower.
• The overall driving performance will be more conser-
vative.
• Some ECO mode functions may be temporarily inhib-
ited based on temperature and other factors.
NOTE: ECO mode is only available in AUTO mode.
Active Noise Cancellation
Your vehicle is equipped with an Active Noise Cancella-
tion System, this system is designed to address the
change in exhaust noise whenever the vehicle is operat-
ing in Fuel Economy Mode (ECO) or 4 cylinder mode.
This system relies on four microphones embedded in the
headliner to detect the exhaust drone and prompt an
onboard frequency generator to create counteracting
sound waves through the audio system’s speakers and
sub-woofer. This helps keep the vehicle quiet at highway
speeds.
Eight–Speed Automatic Transmission
The electronic shift lever in this vehicle does not slide like
a conventional shifter. Instead, the shift lever is spring
loaded and moves forward and rearward, always return-
ing to the center position after each gear is selected. The
transmission gear (PRND) is displayed both on the shift
lever and in the Driver Information Display (DID). To
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