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Tesla is recalling nearly all of the vehicles it sold in the U.S., more than 2 million across its model lineup, to fix a defective system that’s supposed to ensure drivers are paying attention 

Documents posted Wednesday by U.S. safety regulators say the company will send out a software update to fix the problems.

 by the National Highway Traffic Safety Administration into a series of crashes that happened while the Autopilot partially automated driving system was in use. 

The agency says its investigation found Autopilot's method of ensuring that drivers are paying attention can be inadequate and can lead to foreseeable misuse of the system.

The recall covers models Y, S, 3 and X produced between Oct. 5, 2012, and Dec. 7 of this year.

The software update includes additional controls and alerts “to further encourage the driver to adhere to their continuous driving responsibility,” the documents said.

The update was to be sent to certain affected vehicles on Tuesday, with the rest getting it at a later date, the documents said.

Autopilot includes features called Autosteer and Traffic Aware Cruise Control, with Autosteer intended for use on limited access freeways when it’s not operating with a more sophisticated feature called Autosteer on City Streets.

The software update apparently will limit where Autosteer can be used.

“If the driver attempts to engage Autosteer when conditions are not met for engagement, the feature will alert the driver it is unavailable through visual and audible alerts, and Autosteer will not engage,” the recall documents said.

Depending on a Tesla’s hardware, the added controls include “increasing prominence” of visual alerts, simplifying how Autosteer is turned on and off, additional checks on whether Autosteer is being used outside of controlled access roads and when approaching traffic control devices, “and eventual suspension from Autosteer use if the driver repeatedly fails to demonstrate continuous and sustained driving responsibility,” the documents say.

 say that agency investigators met with Tesla starting in October to explain “tentative conclusions” about the fixing the monitoring system. Tesla, it said, did not concur with the agency's analysis but agreed to the recall on Dec. 5 in an effort to resolve the investigation.

Auto safety advocates for years have been calling for stronger regulation of the driver monitoring system, which mainly detects whether a driver's hands are on the steering wheel. They have called for cameras to make sure a driver is paying attention, which are used by other automakers with similar systems.

Autopilot can steer, accelerate and brake automatically in its lane, but is a driver-assist system and 

. Independent tests have found that the monitoring system is easy to fool, so much that drivers have been caught while driving drunk 

In its defect report filed with the safety agency, Tesla said Autopilot's controls “may not be sufficient to prevent driver misuse.”

A message was left early Wednesday seeking further comment from the Austin, Texas, company.

Tesla says on its website that Autopilot and a more sophisticated Full Self Driving system cannot drive autonomously and are meant to help drivers who have to be ready to intervene at all times. Full Self Driving is being tested by Tesla owners on public roads.

In a statement posted Monday on X, formerly Twitter, Tesla said safety is stronger when Autopilot is engaged.

NHTSA has dispatched investigators to 35 Tesla crashes since 2016 in which the agency suspects the vehicles were running on an automated system. At least 17 people have been killed.

 into multiple instances of Teslas using Autopilot crashing into parked emergency vehicles that are tending to other crashes. NHTSA has 

 in pursuing safety problems with Teslas in the past year, announcing multiple recalls and investigations, including 

In May, Transportation Secretary Pete Buttigieg, whose department includes NHTSA, said Tesla 

shouldn’t be calling the system Autopilot

In its statement Wednesday, NHTSA said the Tesla investigation remains open “as we monitor the efficacy of Tesla’s remedies and continue to work with the automaker to ensure the highest level of safety.”

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Tesla is recalling more than 2 million vehicles across its model lineup to fix a defective system that’s supposed to ensure drivers are paying attention when they use Autopilot.

Tesla recalls nearly all vehicles sold in U.S. to fix system that monitors drivers using Autopilot

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