GM’s plans to double truck production at its factories in Indiana and Michigan have been put on hold due to a parts shortage from Mexico.

GM had planned to call in roughly 1,300 workers this week to increase pickup production but according to a report from The Wall Street Journal, those plans were shelved as the company’s parts suppliers in Mexico failed to meet demand.

Despite ongoing COVID-19 challenges, particularly in Michigan where work restrictions have generated plenty of controversy, GM, Ford and FCA resumed auto production in Detroit last week.