I have an 01 Ram 4X4 Off Road pkg. I bought it new in 2000. I have had it in to the dealer a few times for the cruise control problems. It wouldnt hold. There were times that it would but them slowly start creepin down. Of course they could never found or fixed anything. I don't know if its just me but in the valley in Sacramento it seemed to work ok but traffic here never really allowed me to use it. When i was up at altitude going across Nevada is when I was basically seeing the problem.

Long story short it never worked as advertised and now is way out of warranty. I did the ign on off thing and came up with this code.

P1596 Speed Control Switch Always High Speed control switch input above maximum acceptable
voltage

What steps should I take to isolate and repair this?

Jeff

 

sounds like some sort of short in the system. call the dealer and see what they have to say (probably "bring it in so we can look at it") But they might be able to help. if not, try calling a local machanic and see if he has seen it before. i tried searching for ya, but was unable to find a good answer for ya. By the way welcome to DF [sm=welcomesign.gif]

 

I think the cruise control is controlled by the vacuum off the engine (I could be wrong on this), depending on how far above sea level you were, the decreased atmospheric pressure can affect the pressure of the vacuum generated which would then affect the cruise control. I know oldcars and trucks with vacuum powered windshield wipers would have them fail whenthey were driving in the mountains. A vacuum leak would cause the same reaction. Again, this is only if the cruise control is controlled by a vacuum.

In the event its an electronically controlled, it could be your rear speed sensor. I'm not sure if this is the controller for the CC but, these are known for collecting metal particles and faulting. Replacing or even cleaning the currentpart can fix them,but I've never heard of them effecting the CC.

 

from what i did read, in reguards to your code, the speed sensor did play a role in the other guys problems. but not 100% sure thats your problem.

 

Thanks for the welcome and posts I'm still looking to see if I can figure this out maybe this weekend.

Jeff

 

i also have a problom only my set cruise works what is that all about any info would be great

is it something in the wheel or some wires what could it be i dont know nothing about this stuff

 

Is this the same speed sensor for the ABS, and if so wouldn't it set the ABS light? I'm leaning towards vacuum leak. I'd look at my truck but can't right now - loaned it to one of my kids

 

Can you tell me hpw to do the key on off thing to get codes iv have never heard of that

 

turn the key sort of slowly from off to on (where dash lights come on - but not all the way to start) several times. pause for a second at each stop. later models display the codes in the digital odometer. older models flash something, maybe check engine light and you have to count the flashes.

on - off - on - off - on. watch for the codes/flashes.

most all auto parts stores will also read them for free. be leary about listening to their interpretation of the codes though. best to write them down and come back and research them. some places will sell you an expensive o2 sensor you don't need.