If you have a look at the FAA AIM, there is controller phraseology "squalk standby" which means to disable the transponder. This is to be used when the transpon

If you have a look at the FAA AIM, there is controller phraseology "squalk standby" which means to disable the transponder. This is to be used when the transponder is seen by the controller to be emitting unreliable or incorrect information. Keep in mind the transponder system design originated in WW2 and is quite crude. The crew and controllers are the main form of error detection and correction.