Nico Rosberg has been handed a 10-second time penalty after stewards deemed that Mercedes had breached Article 27.1 of the Sporting Regulations and offered radio advice to the German at the British Grand Prix.
Rosberg's car developed a gearbox problem during the closing stages at Silverstone and he was informed by Mercedes to avoid seventh gear, as well as to change to a different setting.
Rosberg nursed his car home in second position but the 10 second sanction demotes him to third spot, behind Max Verstappen, and reduces his title advantage over Lewis Hamilton to one point.
"Having considered the matter extensively, the Stewards permitted that the team have some instructions to the driver that were specifically permitted under Technical Directive 014-16," read a statement.
"However, the Stewards determined that the team then went further and gave instructions to the driver that were not permitted under the Technical Directive, and were in Breach of Art. 27.1 of the Sporting Regulations, that the driver must drive the car alone and unaided."
Mercedes confirmed after the decision that it intends to appeal Rosberg's penalty.