Tesla Model S & X Autopilot 3.0 Computer (2016-2020): Upgrade, Diagnosis, and Replacement

Understanding Autopilot Hardware in 2016-2020 Model S & X

The 2016-2020 timeframe for the Tesla Model S and Model X covers several generations of Autopilot hardware. It's crucial to identify which hardware your vehicle has before purchasing a replacement or upgrade. You can find this information in your vehicle's touchscreen by navigating to Software > Additional Vehicle Information. The entry for "Autopilot Computer" will specify the version.

• Autopilot Hardware 1.0 (AP1): Found in vehicles built from September 2014 to October 2016, this system uses a single camera and a Mobileye chip. It is not capable of running modern FSD software and cannot be upgraded to HW3.0.
• Autopilot Hardware 2.0 (HW2.0): Introduced in late 2016, this was Tesla's first in-house system with eight cameras and an NVIDIA computer.
• Autopilot Hardware 2.5 (HW2.5): A minor update to HW2.0, introduced in mid-2017, which added some processing redundancy. Vehicles with HW2.0 or HW2.5 can be physically upgraded to HW3.0.
• Autopilot Hardware 3.0 (HW3.0 / FSD Computer): Introduced in April 2019, this is Tesla's custom-designed computer necessary for Full Self-Driving features. Many 2019-2020 vehicles came with HW3.0 from the factory, while earlier 2016-2018 models with HW2.0/2.5 required a physical swap to get this computer.

This guide focuses on the Autopilot Hardware 3.0 computer, as it is the relevant ADAS control unit for enabling modern features on all 2016-2020 Model S and Model X vehicles.

Symptoms of a Failing Autopilot Computer

A failing Autopilot computer can manifest in several ways, ranging from the loss of driver-assist features to a completely unresponsive unit.

• Loss of Autopilot and FSD Features: The most common symptom is the complete unavailability of Autosteer, Traffic-Aware Cruise Control, and FSD visualizations (seeing other cars on the screen).
• Error Messages on Touchscreen: You may see specific alerts like "Autopilot cameras unavailable," "Driving visualization temporarily degraded," or "Cruise control unavailable." A "Hardware Configuration Mismatch" error can also indicate a problem with the computer.
• Disabled Safety Features: Failure can disable related active safety systems, including Automatic Emergency Braking, Forward Collision Warning, and Lane Departure Warning.
• Camera Malfunctions: The backup camera and other cameras may fail to display, and Sentry Mode will be unavailable.
🎬 Watch: Troubleshooting tips when Autopilot and Sentry Mode fail
• Overheating: In some cases, the computer can overheat, causing it to shut down during use, especially while preconditioning for Supercharging.

Known Issues, Recalls, and Service Bulletins

While there are no specific recalls for widespread hardware failure of the HW3.0 computer itself within the 2016-2020 model years, the Autopilot system has been the subject of major software-related recalls.

• NHTSA Recall 23V-838 (December 2023): This major recall affected over 2 million Tesla vehicles, including the 2016-2020 Model S and X. It addressed concerns that the Autosteer feature did not do enough to prevent driver misuse. The remedy was an over-the-air (OTA) software update that added more stringent driver monitoring alerts. This was a software issue, not a hardware failure.
• NHTSA Recall 23V-085 (February 2023): This recall covered vehicles with the Full Self-Driving (FSD) Beta software, including applicable 2016-2023 Model S and X vehicles. It addressed behaviors like rolling through stop signs or acting unpredictably in intersections. The fix was also an OTA software update.

It's important to note that later hardware versions (HW4.0, found in 2023+ vehicles) have experienced issues with the computer short-circuiting, but this problem is not known to affect the HW3.0 computers in the 2016-2020 models.

Replacement and Programming

Replacing the Autopilot computer is a task that requires both physical installation and critical software procedures.

Physical Installation

In the Model S and Model X, the Autopilot computer is located behind the glove box. The physical replacement involves:

1. Powering down the vehicle via the touchscreen.
2. Removing the glove box assembly.
3. Disconnecting the electrical connectors from the computer.
4. Unbolting the four nuts holding the computer to the cross-car beam.
5. Installing the new unit and reversing the steps.

While the physical swap is straightforward for a mechanic, the software side is complex.

Programming and Calibration

Buying a Used Advance Driver Assistance System (ADAS) Control Unit

Purchasing a used HW3.0 computer can be a cost-effective way to replace a failed unit or upgrade from HW2.5, but it carries significant risks if you don't know what to look for.

• Verify the Hardware Version: The most critical step is to ensure you are buying a Hardware 3.0 (HW3.0) computer. The part numbers listed in this guide are for HW3.0 units. Do not purchase an HW2.0 or HW2.5 computer if your goal is FSD capability.
• Factor in Programming Costs: A used computer from an online marketplace might cost $200-$400, but it is useless without programming. You MUST have a plan for installation and programming by Tesla Service or a rare, highly specialized independent shop that has invested in Tesla's diagnostic software.
• Physical Inspection: When the part arrives, check for any signs of physical damage, especially to the connectors. Ensure all pins are straight and free of corrosion.
• Seller Reputation: Buy from reputable automotive recyclers who specialize in Tesla parts. They are more likely to have correctly identified and handled the component.
• Understand the 'Unfused' Terminology: Some listings may mention 'Unfused Assembly'. This is a technical descriptor and does not affect compatibility for a standard replacement.

Cost Comparison

The cost of replacing the Autopilot computer varies greatly depending on whether it's an upgrade or a simple replacement, and who performs the labor.

Frequently Asked Questions (FAQ)