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Replace the burnt out light bulb
autozone.com has online manuals you can access for free
it means that you have a bulb out somewhere on your truck.... IE backup light, brake light, turn signal, running light.. etc etc..
find out what is causing it to come on (by going to a shop) and correcting it.
All that info can be found in the owners manual.
From behind the light bezel (under the truck) quarter turn and remove the lamp holder. Replace with an "893" type bulb
turn key to on position but don't start it, depress the gas pedal fully 3 times then start the truck and the warning should be gone!
turn key to "on" position (not running) depress the accelerator pedal 3 times and start vehicle ......warning / light should then be off
Turn the ignition on, engine off. Press the gas pedal to the floor three times.
Turn on the truck next time
Pull the 4x4 lever or turn the 4x4 nob depends on what year the truck is
The remote amp turn on a 2012 Dodge Ram 1500 is the wire that taps on the harness to supply the 12v.