Having updated its autonomous emergency braking (AEB) to react at highway speeds, Tesla has temporarily switched off the system in select new Model S, Model X and Model 3 units, promising owners of affected cars that the system will come back online and be fully functional within six weeks, according to Consumer Reports.

“We recently introduced some minor hardware changes to the Autopilot system in new cars, and we are now in the process of robustly validating the new hardware using real-world driving data,” said a Tesla spokesperson.

“During that process, Automatic Emergency Braking will temporarily be inactive and will instead be in shadow mode, which means it will register how the feature would perform if it were activated, without taking any action. This temporary calibration period is standard Tesla protocol and is done out of an abundance of caution,” the spokesperson added.

Tesla has reportedly produced certain vehicles from the Model 3 production run with a new, different hardware configuration, according to the report. While the system has been said to work on vehicles thus equipped, the temporary switching off is required for Tesla to ensure that the software and hardware are paired and calibrated correctly for 100% functionality.

Much like our computers and mobile devices, Teslas rely on over-the-air updates, and in the case of the recent Hurriance Irma, Tesla owners in the vicinity whose vehicles have a 60 kWh battery capacity received a temporary, free-of-charge upgrade to a 75 kWh capacity over the air in case they needed the additional range to evacuate.

The over-the-air updates could take a while, however. Buyers of Model S and Model X Teslas built after October 2016 were promised AEB as a standard feature, though it wasn’t until July this year that the software was updated for AEB to be fully functional, prior to this temporary shutdown.