tow/haul Mode Question -
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back > Models > Jeep Grand Cherokee & Commander Forums > WK Grand Cherokee & XK Commander Forum > tow/haul Mode Question

6th annual beat your wife to the credit cards sale!!Get ready!! CyberMonday deals are coming!!!Last few hours of great savings

Unread 01-09-2014, 04:50 PM   #1
Registered User
2005 WK 
Join Date: Mar 2013
Location: Raleigh, NC
Posts: 42
tow/haul Mode Question

So, having a bit of a family debate about what exactly the tow/haul feature does on my 2005 Grand Cherokee 4.7. I'm aware that it locks out overdrive, and seems to raise the shift points a tad. Does it also affect the actual engine in any way? Does it modify engine timing, fuel/air charge, etc? In other words, does it affect fuel economy and engine power?

RedWagon1006 is offline   Reply With Quote Quick reply to this message
Unread 01-09-2014, 08:03 PM   #2
Registered User
2005 WK 
Join Date: Mar 2007
Location: St. Louis
Posts: 212
From what I have noticed while towing and using the the Tow/Haul is that it does lock out 5th gear and yes it seems to raise the shift points a little. It will also down shift to use engine braking to keep your speed in check if it senses you are picking up too much speed while not on the gas or braking. That's all I seem to notice it doing. I don't believe it does anything to the engine programming.

Edit: I read that on the Hemi engine it locks out MDS. It will also lower you mileage since it locks out the 2nd overdrive and raises the shift points.
muddyjgc is offline   Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. is not in any way associated with Jeep or the Chrysler Corp.