Every time I drive my truck (1999 dodge 1500 4x4 5.9 Magnum automatic) it stalls on me once it gets up to temp. If i put it in park remove/reinsert the key It will start right back up . It always runs great and then it just stops. Yesterday I was on the highway and the Speedo went down to zero, a couple seconds later the tachometer dropped to zero, a couple seconds later I lost throttle response so I pulled to side of the road and the engine died. Put it in park removed key, inserted key started right up and I drove home without a problem. Super wierd, any ideas or thought to what this might be?!

 

Any codes? Might want to check the large plugs going into the pcm.

 

Throttle Position Sensor?

 

It has a new TPS, and the plugs into the PCM are secured. I'm going to replace the ignition switch and lock cylinder. I'll let y'all know if that works or not.

 

And there are no codes

 

What brand TPS?

 

Okay so I replaced the ignition and lock cylinder, also replaced crank position sensor. But the truck still stalls when it's warmed up. This time however I noticed the dash said NO BUS witch means there is no communication with the PCM. And once the truck cools off a bit it'll start up. I am thoroughly stumped, I'm thinkin a new PCM? Any other suggestions?

 

A bad sensor can cause a NO BUS

 

Assuming you have a code reader at hand have it connected and ready when going on a drive. When the truck dies see if the reader can still talk to the PCM. If not the PCM has lost power or locked up. Then check fuse 9 in the interior fuse panel if there is power from the ignition switch to the PCM. I'm not clear if "replaced the ignition and lock cylinder" included the ignition switch ?

 

I went ahead and bought a PCM online. I plugged it in, and I've been driving around for a week in 100° + weather and NO stalling!!
It turns out that the PCMs in these trucks are notorious for failing due to bad soldering connections, especially if the truck gets too hot. And my truck had been over heating when I first bought it. So if your truck is stalling and NO BUSing when it gets up to temp, start with your PCM. I took the long way around and spent allot of money on a bunch of sensors hoping for an easy fix and it wasnt worth it.