CDL acting weird.

[JCruse]

I put in the CDL switch back in the spring and it worked after two or three attempts to engage the switch and every time thereafter. I use it at least a couple times a week and never have had a problem. Then two days ago when I hit the button nothing happened, I tried again but still nothing, so I left the button in and went on my way to the fishing spot about a 10 min wheel away. When I hours later restarted the truck to move it the lights (CDL ABS) were on. Then today the same thing happened. I haven't been anywhere near the wiring behind the dash or the kick panel, and no service has been performed on the truck other than new plugs, wires, and distributor/rotor.
What do you suppose is causing my CDL to act in this way?

 

[npg170]

Sticky actuator? Did you try driving in reverse 10ft or so?

 

[spencertron]

I had an eerily similar situation with mine and it did indeed end up being a loose wire behind the kick panel. Like you, I had not touched a thing down there, but when I checked it was a little loose. Good luck!

 

[ironhippy]

I have a similar issue, my CDL does not seem to lock when the truck is very warm (example after driving on the highway for an hour) but will work 100% of the time when the truck is cool

I have not diagnosed it yet, I don't know if the indicator sensor is failing or if the diff is actually not locking.