I was leaving work yesterday and my truck wouldn't start, so i had a friend jump it. It started up, but when I got on the street it wouldn't go over about 25-30 mph, so i drove it to a friends house and parked it. We shut it off and turned it back on and the check engine light stayed on, i put it in reverse and it had a pretty hard jump, but now it runs fine, besides having the engine light on. Any ideas?

2007 Dodge Ram 1500 5.7L Hemi

 

Welcome to the site. Our trucks dont work well with low or dead batteries. I would replace that first and then go from there. The trans may be in "limp mode" but again, it could all be battery related.

 

I drove it over to Auto Zone and had them check the engine code for me and it was p0562:

Loose or missing drive belt
Alternator Defective
Battery Defective
Pool Electrical Connection

We tested the battery and alternator and they were both good, so i went home and disconnected the battery to reset the computer, and when i re-connected it everything works great, so I have no clue what was wrong.

 

My battery has gone dead a few times and 2 out of the 3 times because it was so dead I needed a jump. I had to reset the computer with my tuner(reload) because my truck was in limp mode. The other time I had to reload my programming because my alarm kept locking/unlocking my doors randomly...haha

Anyways, I re-programmed because I had to leave right away and needed to charge the battery. To solve the problem, a hard boot is recoomended. That is to disconnect batt for atleast 20min(or touch pos-neg while both disconnected from batt) to reset pcm.