Valentina Matseletsele said she last saw her son in 1991 when he attended a PAC meeting in Sebokeng.
It was rumoured he left South Africa to join PAC members who were still in exile in Tanzania. She told the commission, sitting in Sebokeng, she did not believe her son had died in a car accident.
Numerous inquiries were made with the PAC, who originally denied he was in exile.
But in March 1994 a man from the PAC's Johannesburg head office told her that her son had died in a car accident, she said.
The PAC said if she could raise R6000, her son's body could be brought back to South Africa. But when she did this the PAC told her he had already been buried and it was no longer possible to transport his remains to South Africa.
"According to Sotho tradition, I don't belive my son is dead because I haven't seen his body," Matseletsele said.
Although the alleged traffic accident fell outside the commission's cut-off date for human rights violations, commission deputy-chairman Dr Alex Boraine said further investigations would be made.
The commission's investigators would approach the PAC for further information.