Formula 1's governing body is looking into whether Ferrari stretched the new radio clampdown rules, according to a report in Germany's Auto Motor und Sport.
While the new rules severely limit what can be said on the radio, the FIA's Charlie Whiting said in Melbourne that they also apply to dashboard displays and pit boards.
"We do have a camera looking at all the pit boards, so if we see anything unusual we will ask why," he said.
Auto Motor und Sport claimed on Wednesday that a rival team has shown the FIA a photo of a Ferrari pit board in Bahrain displaying the message "3.2-LFS6-P1".
The report said that the FIA is now looking into the matter.