Autonomous trucking technology company TuSimple and truck manufacturer Navistar have scrapped their deal to co-develop self-driving trucks.

In 2020, Illinois-based Navistar bought a minority stake in TuSimple and announced a deal to co-develop heavy-duty self-driving trucks by 2024.

The two-year partnership planned to develop a purpose-built Class 8 autonomous truck for long-haul freight. TuSimple has approximately 8000 reservations for the purpose-built autonomous truck.

In a joint statement, TuSimple and Navistar said the decision to end the development agreement does not preclude the companies from working together in the future.

The move to end the partnership comes less than a month after Cheng Lu returned to his role as CEO of TuSimple after previously being ousted.

“I decided to return as TuSimple’s CEO to address the challenges ahead and to set us on a path to long term stability,” Lu said.

“We have proven our technology works, and I’m committed to addressing the concerns of stakeholders. I firmly believe in this company and its ability to improve the safety and efficiency of the trucking industry through world-class autonomous driving technology.”

Navistar vice president Srinivas Gowda added: “Navistar believes autonomous driving technologies will be a key component of a future transportation and logistics system and is committed to the development of a safe and efficient autonomous driving solution.”