The installation of a module such as a decoder, also called a CAN bus module, removes possible errors from the vehicle's computer. When the original halogen bulbs are replaced by LED it is possible that some vehicle marks display a bulb-out message. Sporadic operation of the bulbs can cause defects in the system which activate the computer control lights. Our CLD bulbs are compatible with CAN Bus modules, so they allow the correct sending of data to the computer in the vehicle. So, a decoder makes it possible to eliminate all error messages and ensure the correct functioning of the bulb, depending on the vehicle in question.