The CANBUS Resistor prevents flickering of LED conversion kits on trucks that use voltage pulses to check for dead bulbs. The voltage isn't enough to fire a halogen bulb, but it is enough to trigger an LED conversion kit. The CANBUS Resistor prevents flicker and a bulb-out message. The real issue is that we can't guarantee whether or not you'll need the CANBUS resistors, since it's just the odd truck that has the problem and it doesn't seem like it's submodel/option package related.