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Old 04-08-2018, 06:20 PM   #1
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Another ECO mode question

Hi guys, noticed something recently that maybe you will have some input on. On my 11' 1500 ST Hemi, The dash shows "ECO" while im driving at all times, sitting still, cruising, wide open trying to pick up speed etc. Im pretty sure that at one point in time, if I was cruising at a steady speed, next to "eco" on the display it would say "on" or nothing if it was off. Noticed recently that it would never say "on". Any thoughts? Im concerned that it is not functioning at all. I dont have the fancy digital display with all of the menus as you can see.....
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Old 04-08-2018, 09:26 PM   #2
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Get to 50 mpg steady cruise and see if the motor tone changes after lock up. Also after cruise for a bit accel a touch and see if it feels like a 4 cyl or if it kicks and goes to 8 cyl. I would assume it’s working if it’s all stock because it would throw a code and engine light if it couldn’t go into MDS mode as that’s an emmisions fault type issue.
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Old 04-09-2018, 03:59 AM   #3
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Eco is either illuminated or not. If the engine is under load there will be no Eco light. Cruise and lower RPM will light up the Eco.

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Old 04-09-2018, 08:08 PM   #4
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Thanks for the reply's. Just interesting because it never goes off then. Always says eco no matter how I am driving. Funny that emissions codes were mentioned because I am currently battling a P0456 and P0457
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