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Old 12-07-2015, 03:39 AM
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What does "Eco" Mode do?

I'm a new Jeep Grand Cherokee Limited (diesel) owner. I'm still getting familiar with it. But two things have me confused. Eco mode and the "sport" mode which is activated by the gear shift.

They seem to do the same thing, and if so, why do they have both modes of operation?

If I turn Eco off via the button on the dash, then activate "sport" via the gear shifter what will this do for the transmission performance profile?

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Old 12-07-2015, 04:36 AM
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Re: What does "Eco" Mode do?

Eco Mode helps improve fuel economy by adjusting the transmission shift schedule, idle speed, interactive deceleration fuel shut off and, in V8 engine models, Fuel Saver cylinder deactivation. Automatically engaged upon vehicle startup, it activates the Quadra-Lift® air suspension system and lowers it when vehicle speed exceeds 55 mph. On 4WD models in 4H, it alters the front-to-rear torque split to increase efficiency.
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Old 12-07-2015, 04:40 AM
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Re: What does "Eco" Mode do?

Sport mode does more than change transmission shift points, if you have QL it will lower the car, it will move torque to the rear wheels up to 80% and reduce ESP intervention. throttle response is supposedly sharper and the transmission seems more responsive.

Eco mode (light on) means it is maximising fuel efficiency, shift points are lower and the transmission tends to be a bit more delayed to throttle input.

Turning Eco off, then selecting sport does nothing different, there are 4 modes. Eco, Eco off, Sport, and manual (flappy paddles).
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Old 12-07-2015, 06:49 AM
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Re: What does "Eco" Mode do?

it gives you better gas mileage by 0.5mpg. at least that's what it feels like.
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Old 12-07-2015, 06:51 AM
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Re: What does "Eco" Mode do?

Shifting to Sport mode, automatically shuts Eco off. Eco and sport take things in the opposite direction.


The owners manual has a pretty good description.


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Old 12-07-2015, 06:58 AM
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Re: What does "Eco" Mode do?

Thanks guys.

Still not sure, but then it's nightshift for me...
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Old 12-07-2015, 07:39 AM
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Re: What does "Eco" Mode do?

The most obvious, but not complete explanation:

Eco mode shifts into higher gears sooner. This gives you less power and is supposed to give you better MPG.

Sport mode holds you in lower gears longer. This gives you more power at the expense of MPG.

With the HEMI, they effect when/if 4 cylinders are shut down,


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Old 12-07-2015, 07:42 AM
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Re: What does "Eco" Mode do?

Well, I was going to ask the same question for those with '15 GC because...

Before the latest Trans flash my '14 Limited V6 (gas) and most on here with early model WK2s were complaining about the lag when accelerating WITH the eco button on. I got used to it and it didn't bother me too much.

Now: with the latest flash ( Nov '15), I see NO difference between having the ECO on or off. It's almost like Jeep got so many complaints in the past that they just changed the software to "better" the acceleration.

Also it seems I get better city MPGs (because it doesn't take that much effort to get going), but worse Highway MPGs. Go figure.

Sport mode : Now it's almost too sensitive. The shift-downs and the higher RPMs are greater then before the flash. I would say I use Sport mode 50% less now ( now that eco mode is more responsive).

I'd be curious, and it sounds like the OP's question, if all MY'15 GC have this "better" transmission.
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