The Caterham driver passed a red light indicating he should stop for weighing at the end of the session in contravention of article 26 of the Formula 1 sporting regulations.
Stewards, including former Benetton and Scuderia Italia and five-time Le Mans 24 Hours winner Emanuele Pirro, heard that Pic had believed the red light was not for him but insisted that the Frenchman should have known he had to stop.
"The driver failed to proceed to the FIA garage for weighing when signalled to do so," said a statement from the officials.
"He admitted having seen the red light and that the official pointed to him.
"However, he claimed that he believed the light was for the car behind him."
This is Pic's second reprimand of the season, meaning he is under threat of a 10-place grid penalty if he incurs another.
His previous one was for rejoining dangerously in front of Sebastian Vettel at Spa after running off track at the chicane during practice.
REPRIMANDS IN 2013
A total of 10 drivers have been hit with official reprimands during the 2013 season. Any driver incurring three is automatically hit with a 10-place grid penalty, providing at least two of them were for 'driving' offenses.
Mark Webber, 3
Charles Pic, 2
Fernando Alonso, 1
Jules Bianchi, 1
Valtteri Bottas, 1
Romain Grosjean, 1
Lewis Hamilton, 1
Kimi Raikkonen, 1
Nico Rosberg, 1
Adrian Sutil, 1
- Sports & Recreation
- Motor Racing
- Scuderia Italia
- Emanuele Pirro