Tesla FSD v14 Lite Update Causes HW3 Autopilot Computer Overheating and Failures
Tesla owners with older Hardware 3 (HW3) systems are reporting Autopilot computer overheating warnings and hardware failures after updating to FSD v14 Lite. The issue is triggered by the high computational load of running a compressed version of the model originally designed for Hardware 4 (HW4). This highlights the severe physical and thermal limitations of deploying complex AI models on legacy edge hardware, potentially forcing Tesla to replace millions of HW3 computers. It underscores the engineering challenges of maintaining software feature parity across different hardware generations. The FSD v14 Lite model runs on HW3's 8GB of RAM, which has only one-eighth of the memory bandwidth of HW4. Affected vehicles trigger the "APP_w141_ECU_Thermal_Issue" fault code, indicating motherboard temperatures exceeding 90 degrees Celsius, which leads to FSD disengagement or complete computer shutdown.
## BACKGROUND
Tesla's Hardware 3 (HW3) was introduced in 2019 as the custom silicon foundation for Full Self-Driving (FSD). In 2023, Tesla introduced Hardware 4 (HW4) with significantly upgraded processing power, memory, and camera resolution. Model compression techniques, such as pruning and quantization, are commonly used in Edge AI to shrink large neural networks so they can run on resource-constrained devices like HW3, but they can still push hardware to its thermal limits.