The figure compared with May's 16.19% year-on-year drop.
In the January-June period, car production contracted 17.39% from a year earlier to 761,240 units, the federation said.
"Stricter measures for credit approval from financial institutions, coupled with household debt that was nearing 90% of GDP, led to a higher rejection rate for auto loans," Surapong Paisitpattanapong, spokesman of the FTI's automotive industry division, told a news briefing.
Domestic car sales dropped 26.04% in June from a year earlier, after a 23.38% annual decline in May, the federation said.
The federation lowered its domestic sales target to 550,000 vehicles from an earlier forecast of 750,000 units. It also cut its production target to 1.7 million units this year, down from at 1.9 million vehicles seen earlier. In 2023, Thailand produced 1.84 million vehicles.
Auto exports were still seen at 1.15 million vehicles this year.
Thailand is Southeast Asia's biggest autos production centre and an export base for some of the world's top carmakers, including Toyota and Honda, with pickup trucks among the key vehicles manufactured.
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