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Old 07-28-2014, 03:29 PM
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Aero Mode Engagement

Hi All,

A couple of months ago I noticed that my air suspension on my '14 Overland Diesel was dropping into aero mode when I was merging onto the highway around 55 MPH. The OM states "The vehicle will automatically enter Aero Mode when the vehicle speed remains between 62 mph (99 km/h) and 66 mph (106 km/h) for greater than 20 seconds or if the vehicle speed exceeds 66 mph (106 km/h)."

I tested my theory a few times by setting the cruise control to 57 MPH while merging onto the highway in both ECO mode, and with ECO turned off, and as I suspected the suspension had dropped to aero as soon as it hit 56/57 mph in either case.

I assumed maybe the software was off, but I just took my car in for its first service three days ago and when I asked the service manager and technician, they both stated that the suspension was operating normally and the speeds listed in the OM must be a mis-print, which I find suspicious. They actually went as far as to state on my service paperwork that the OM was mis-printed.

The only reasons this truly bothers me is that #1. I like things to work properly as described, and #2. on my daily commute, traffic can have you varying from 60 mph to 20 mph and back multiple times over my 12 mile trip. Having the suspension constantly cycling up and down is not ideal and fairly annoying and this would not occur for the most part at the speeds listed in the OM. Yes, I realize I can drop into Sport mode and remain in aero the entire time as a partial solution, but as many of you know that's a trade-off as well in terms of fuel economy and shift patterns while in traffic.

So long story short, has anyone noticed this issue? And does anyone know if the OM is in fact wrong? Or was there possibly a software update or TSB that possibly adjusted the speeds since the OM was issued? I can certainly see merit in having aero mode engage over 50 mph, but as I mentioned above I prefer to know things are working as they should on a brand new vehicle so any feedback is greatly appreciated.

Thanks as always and look forward to hearing back.
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Old 07-28-2014, 03:54 PM
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Re: Aero Mode Engagement

Mine goes up some times while I entering a highway and goes down when I hit traffic. I don't consider it an issue. Since I don't focus on the instrument panel it probably happens more than I notice, and that's the way it should be, IMHO.


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Old 07-28-2014, 03:59 PM
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Re: Aero Mode Engagement

Quote:
Originally Posted by bill_de View Post
Did you read everything?

note when eco mode is enabled the air suspension ...

... or goes above 56 mph.


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Admittedly it is cleverly hidden in the very next paragraph...

Any time ECO mode is enabled:

"NOTE: When ECO Mode is enabled the air suspension
system lowers the vehicle to Aero mode when the vehicle
speed is between 52 mph (84 km/h) and 56 mph
(90 km/h) for 20 seconds or goes above 56 mph
(90 km/h). The vehicle will exit Aero mode if the vehicle
speed remains between 20 mph (32 km/h) and 25 mph
(40 km/h) for 20 seconds or if the vehicle speed falls
below 20 mph (32 km/h)."
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  #4  
Old 07-28-2014, 04:12 PM
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Re: Aero Mode Engagement

Personally I'd like to keep the thing in OFF-ROAD 1 or at least have a way to defeat AERO MODE.
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Old 07-28-2014, 05:26 PM
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Re: Aero Mode Engagement

Hi lstowell,

As I mentioned in my post, I tried with ECO both ON and OFF with the same result.
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Old 07-28-2014, 07:38 PM
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Re: Aero Mode Engagement

I don't think this is a problem. It takes a few moments for the suspension to lower into aero or raise to normal ride height. By the time the EVIC displays the suspension position you're usually a few mph higher or lower than stated in the OM.
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Old 07-28-2014, 09:29 PM
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Re: Aero Mode Engagement

If you are worried about overworking the air suspension, use Sport mode. It will set to aero mode and keep it there.
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Old 07-28-2014, 10:19 PM
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Re: Aero Mode Engagement

MDBones, I don't think you understand the issue. Regardless of the time it takes for the suspension to adjust, no adjustment should take place at all below 62 mph when ECO mode is disabled. In my vehicle the suspension is automatically lowering to aero with ECO OFF at speeds over 52 mph. According to the OM this should not happen.

And again, Rich Mac, thanks for the reply but as I mentioned in my post I am very aware that using sport mode locks the suspension in aero. However that neither answers the question of whether the OM is just wrong about the listed speeds or whether my vehicle has a software issue that my dealer should correct. Again my main concern is things operating as described and according to the OM.


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Old 07-28-2014, 10:25 PM
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Re: Aero Mode Engagement

I just read through the OM and didn't find anything about aero with ECO OFF. Could you cut and paste that passage for me?
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Old 07-28-2014, 10:40 PM
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Re: Aero Mode Engagement

Here is the note from page 126 in the user guide, 7th edition:
NOTE:
When ECO Mode is enabled the air suspension system lowers the vehicle to Aero
mode when the vehicle speed is between 52 mph (84 km/h) and 56 mph (90 km/h)
for 20 seconds or goes above 56 mph (90 km/h). The vehicle will exit Aero mode if
the vehicle speed remains between 20 mph (32 km/h) and 25 mph (40 km/h) for
20 seconds or if the vehicle speed falls below 20 mph (32 km/h).
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Old 07-29-2014, 08:21 AM
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Re: Aero Mode Engagement

Yes, I read that. I'm a little confused about your original question. I still haven't read anywhere, including your last post, about aero behavior when ECO mode is off. It says what to expect when ECO mode is enabled, but doesn't explain what to expect when ECO mode is off. It's my assumption that aero behaves the same with ECO mode on or off. It only changes in Sport mode. Where are you finding "ECO off" aero behavior?
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Old 07-29-2014, 09:00 AM
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Re: Aero Mode Engagement

I think the way the manual is written (poorly to say the least) it describes how the system works without eco mode. Then, as an added note it mentions how it works with eco mode.

Maybe the first was written before there was an eco mode. Since eco mode is the default, how it works with eco off should have been the 'note'.


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