The Securities and Exchange Commission is investigating whether Nissan Motor Co. accurately disclosed its executive pay in the U.S., according to several sources.

The U.S. financial regulator is examining whether Nissan's executive-pay disclosures were accurate and whether the carmaker maintained adequate controls to prevent improper payments, the sources said, asking not to be identified because the probe hasn't been disclosed publicly.

Nissan, in response to questions, confirmed it has received an inquiry and said it is cooperating fully. Through spokeswoman Kristina Adamski, the company said it could not provide further details.