P0720 and dead battery - Ford Powerstroke Diesel Forum
Please Visit our Site Sponsors
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 03-15-2010, 12:17 PM

Join Date: Mar 2007
Location: Arlington, VA
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
P0720 and dead battery

I just replaced my batteries less than six months ago. The batteries that I had in the truck were only a year old and were replaced under warranty because they failed. I did some basic electrical tests to check for amp draw with the key off, charging voltage, etc., but found nothing of real concern, so I assumed I just got bad batteries the last time around. During a recent blizzard here in Northern VA, I was out in 4WD high and as I was cruising down the road, the truck stuttered for about 5 seconds and the engine cut off. I immediately tried to restart it and my starter solenoid started to click. I finally got a jump from a firefighter in a Suburban with an HD charging system and dual batteries and I got my *** home as fast as I could, where it began to stutter again just as I pulled into my spot. At this time it was in 4WD low, the SES light was on, and the O/D light was flashing. I shut it off and let it get snowed in. A week later, I went to move the truck and the batteries were so dead it wouldn't even chatter the solenoid. I got it jumped again, took it out of 4WD (in neutral) and then engaged reverse. When I pressed the throttle, it made a whirring sound like it wasn't fully engaged in gear. It almost sounded like a REALLY bad P/S pump. I put it back in park, then back to R and it moved fine. Let it idle for about 30 minutes after I moved it so it could charge. During that time I checked codes and got a P0720. Truck didn't move for another 2 days. Went to start it again and it was dead. I've heard of the OSS causing problems due to RF interference from a bad alternator, but I can't help but think that there may be more than one problem (due to my tranny/4WD behavior). I know on some Explorers people have had problems directly linking the electronic 4WD and the OSS. If anyone has any ideas or has had a similar problem, please let me know. Thanks!
Reply With Quote Quick reply to this message
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum 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 email address for yourself.
Email Address:
What state or province do you live in?
Security Question
*Required, this field is not shown to others. Enter the last two characters of the word "Powerstroke"
Security Question #2
*Required, this field is not shown to others. "While balancing on a piece of wood, two inches by four inches known as a 2x4, john and his friend sally both spotted a dalmatian inside a truck with sirens, headed to put out a fire. State the animal mentioned in the sentence above."
Please select your insurance company (Optional)


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
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -8. The time now is 01:44 PM.

Powered by vBulletin® Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.