I have a 2005 Dodge 2500 with the 5.9l Cummins. The door locks no longer auto lock after 12-15MPH. Is there a sensor for this? I couldn't find anything except the ABS Wheel speed sensor, is this the culprit?

 

For future reference:
https://dodgeforum.com/forum/dodge-r...ead-first.html

 

doubt it unless your speedometer does not work...

it is a feature that can be enabled and disabled.

try turning the key on and off 4 times and on the 4th time turning the key on, turn it back off and hit the door lock switch within 10 seconds of the final key cycle.