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If you have two keys that start the truck, you can used them to get the code.
From 2015 Owner's manual
Displaying the Factory Set Code
Note: You will need to have two programmed passive anti-theft keys for this procedure.
To display the factory-set code in the information display:
1. Insert a key into the ignition and switch the ignition on for a few seconds.
2. Switch the ignition off and remove the key.
3. Insert the second key into the ignition and switch the ignition on. The factory-set code will display for a few seconds.
Note: The code may not display until after any other warning messages first display.
If you have two keys that start the truck, you can used them to get the code.
From 2015 Owner's manual
Displaying the Factory Set Code
Note: You will need to have two programmed passive anti-theft keys for this procedure.
To display the factory-set code in the information display:
1. Insert a key into the ignition and switch the ignition on for a few seconds.
2. Switch the ignition off and remove the key.
3. Insert the second key into the ignition and switch the ignition on. The factory-set code will display for a few seconds.
Note: The code may not display until after any other warning messages first display.
If that doesnt work the code is on one of the plug ins in the bcm. The bcm is in the right kick panel.Thats how I found mine. on a 2011.
I found mine on my 2015 in about two minutes, Passenger side kick panel, remove it and you will see the BCM. The BCM has a sticker on it with the number.