Targets deemed unrealistic or destructive by some board members triggered the sudden fall of Stellantis CEO Carlos Tavares just a month after he received their full backing, sources told Reuters. Unhappy with his aggressive targets for sales and cost cuts and his contentious dealings with the giant automaker’s suppliers,

The global automaker’s sales in North America fell over the past year as dealers struggled to sell high-cost models.

Stellantis CEO Carlos Tavares is stepping down after nearly four years in the top spot of the automaker, which owns car brands like Jeep, Citroën and Ram, amid an ongoing struggle with slumping sales.