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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?
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.