Control chip Control chips , also known as inhibitor chips , were a type of organic bio - chip capable of dictating or responding to the thoughts of its host . Kaminoan cloners implanted them within each clone trooper in the Grand Army of the Republic . It was implanted into the brain of every trooper at the third stage of their embryonic development . When they were activated the troopers responded to orders without question , allowing the Supreme Chancellor to initiate Order 66 . The Galactic Empire later employed these devices to keep in line its enslaved Wookiee population on Kashyyyk . Description . Inhibitor chips had been implanted in the clone trooper s to make the clones less aggressive than the clone template . Unbeknownst to Sifo - Dyas , however , the chips were also tooled to another purpose : to force the clones to comply with the execution of Order 66 , which wiped out nearly all Jedi . The chips were later installed in enslaved Wookiee s by the Galactic Empire . History . Prior to the battle of Naboo , former Jedi Council member Jedi Master Sifo - Dyas contacted the Kaminoan s to order a clone army for the Republic . He provided them the inhibitor chip to make the clones less aggressive than the clone template and to act as a safeguard against betrayal from rogue Jedi . However , Sith Lord s Darth Sidious and his new apprentice , Darth Tyranus , had Sifo - Dyas eliminated and took over his project , keeping it a secret from the Jedi . Order 66 . During the Clone Wars , the inhibitor - chip conspiracy was nearly uncovered when the Order 66 function of the chip in the clone trooper Tup was prematurely activated , causing him to execute the Jedi General Tiplar . Though the Jedi discovered the existence of the inhibitor chip , they never learned that it was also used to issue Order 66 , as the clone Fives , who had been investigating the matter , was killed by Commander Fox . Though Fives had warned that the conspiracy went to the highest level and that Supreme Chancellor Sheev Palpatine had tried to stop him from revealing what he knew , Anakin Skywalker stubbornly refused to believe that Palpatine was capable of what Fives was describing . Age of the Empire . Some clones , however , removed their chips from their heads before the order was given , so they did not betray their Jedi comrades . At least 3 clones , Rex , Wolffe , and Gregor , removed their chips and moved to a modified AT - TE . Once the Galactic Empire gained control of the galaxy , it enslaved the Wookiee population of Kashyyyk . Enslaved Wookiees were installed with inhibitor chips which could be used to cause them extreme pain should they rebel against their captors . The chip could be activated in a rebelling Wookiee , causing pain until the Wookiee either fell back in line or died from the pain . As the Empire became more savvy , a common tactic was to instead subject family or clan members to pain , as the Wookiees would often be willing to sacrifice their own lives but couldn ' t bear to see the suffering of clan or family members . During the liberation of Kashyyyk , a strike team led by Han Solo disabled the field controlling the inhibitor chips , effectively rendering them useless and allowing the Wookiees to strike freely , though this was met with an orbital bombardment by Star Destroyer s from the Galactic Empire . Ultimately , the Imperial occupiers were defeated when a small New Republic fleet led by Admiral Ackbar and Captain Wedge Antilles entered the Kashyyyk system and forced their surrender . Chewbacca ' s son Lumpawaroo likened the inhibitor chips to a song which sounded like the thrumming wings of a swarm of drriw - tcha blood - worm flies . Rax also installed inorganic bio - chips in the brain stems of a hundred Rebel Alliance prisoner s at Ashmead ' s Lock prison on Kashyyyk . These prisoners were part of a secret contingency plan to assassin ate New Republic government officials and military commander s during the Liberation Day celebrations on Chandrila in 5 ABY . Rax and his undercover agent Windom Traducier used a transponder installed at the Hanna City opera house to transmit signals which activated the agents . Prisoners installed with the bio - chips included Brentin Lore Wexley , Jonda Jae - Talwar , and Esdo . The unwilling assassins killed several New Republic officials and commanders , including Hostis Ij , but failed to kill Chancellor Mon Mothma . The New Republic authorities managed to subdue the prisoners . Investigations by the New Republic Security Bureau and the slicer Conder Kyl uncovered the chips . However , they malfunctioned as some kind of planned degradation before the New Republic could conduct further investigations .