Hello, I'm new here and got a huge problem...I have a ram 2500 5.7 hemi gas engine slt 4 door with 8 ft bed. I have had this truck for 3 months in and out of dealerships and they can't figure out why the cruise shuts down after 63 mph. Otherwise it works just fine. I do not have big tires on it. It has the normal 17's on it that it is suppose to have. The dealership had a expert come up from Iowa and said to replace the power train module and the abs module and that will fix it....well it didn't...no one around Madison Wig can figure out why this is happening to this truck so thought I would try my luck here... the speedometer is calibrated so I know that's not it so any idea on what I can do would be greatly appreciated. Thanks

Steve

 

What model year of truck do you have?

For future reference:
https://dodgeforum.com/forum/dodge-r...s-section.html

 

hi thanks for the reply....it is a 2004 Ram 2500 SLT heavy duty 5.7 hemi I'm not sure if that's the info your looking for...please let me know

Thanks

 

Since the cruise system is a pressurized system I'd be looking for a leak in a line or a failed clamp. Odds are it's a small leak which doesn't effect the system until pressure builds to a point (which would explain why it stops working at higher RPMs or basically around a certain speed).

I helped a girl diagnose this same issue on her truck a few years back and found a cracked hose:



Which caused the same symptoms you are experiencing. Replacing the hose fixed the problem in her case...

 

that sounds great I will definitly look into that...where about is that hose on that pic that you posted? so i know right where it is...man I sure hope that is it lol, it's not like I use the truck alot but it sure sucks when it does'nt work right

Steve

 

anyone else have any idea's ??

 

check the hoses first then we can track it back from there.

 

The cruise is computer controlled, with the hemi being fly-by-wire vacuum hoses should have no bearing on it.

 

Yes but the cruise computer uses inputs from the various sensors to determine load on the engine, that is why the truck downshifts for you while in cruise control when going up or down a hill... So the vacuum lines should be checked.

Next thing to check is speed and ABS sensors to make sure they are not damaged or malfunctioning.

 

great thanks for the replys....I will check all the vacuum lines and I'm not sure about the ABS sensors...how many are there?