Does FSD (Supervised) Lite overheat the HW3 computers in older Teslas? Only cars without a heat pump, but yes, that seems to be the case.

According to Electrek — a site not well-regarded by Tesla enthusiasts for focusing too much on the manufacturer’s flaws — Tesla vehicles with older hardware platforms (HW3/FSD 3.0) are experiencing overheating in their computing systems. The cause is said to be FSD Lite, which is a version of FSD (Supervised) tailored to the capabilities of older computers. The initial conclusion is that the software demands too much from the electronics, and the cooling systems are not designed to handle such power consumption (and heat generation).

FSD Lite as an incentive to upgrade to a newer car?

Electrek claims that several owners of older Teslas contacted them, reporting overheating alerts when drivers attempted to use the reduced version of FSD (Supervised). Excessively high temperatures prevent FSD Lite from restarting, and in some cases, even cause the computer to fail. The Michigan Tesla account even shared several photos from Service Mode, showing that the temperature of the Autopilot’s motherboard (i.e., the FSD computer) reached 96 degrees Celsius, which is “outside the recommended operating range.”

V14 Lite displayed red error messages and refused to restart several times.

I checked Service Mode, and it’s caused by the AP ECU overheating. pic.twitter.com/szCo26YWRm

— The Michigan Tesla (@Michigan_Tesla) July 23, 2026

The video documents a situation where FSD Lite shuts down and cannot be restarted. One commenter asked whether the battery might have been in charging preparation mode, as this significantly raises cell temperatures and thus the temperature of the coolant that manages energy extraction from the FSD computer. The answer was yes, as the computer is used as one of the heaters for the cells.

Similar situations—equipment overheating and FSD shutting down—occur when coolant levels are low, there are air bubbles in the circulation, or the radiator is blocked. In models produced over the past few years with heat pumps, the two systems are separated, so such situations should not occur.

FSD Lite is a version of FSD 14.x tailored to the hardware capabilities of the HW3 platform, meaning weaker processors, cameras with lower resolution, and memory buses with a bandwidth of only 15 percent that of HW4’s buses. The first FSD computer turned out to be too weak for the software, so the last version of FSD it received was 12.6. HW3 cars did not get software from the 13.x series, and for the 14.x version they must settle for the Lite variant.

(Supervised) FSD Lite represents a potential fulfillment of Elon Musk’s promise that existing car buyers would receive software that could turn their vehicles into self-driving cars. However, with this hardware configuration, full autonomy (SAE Level 4) will not be achieved; the potential maximum is Level 2.99, which represents a highly autonomous Autopilot.

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