Last week, police raided Uber offices in the southern city of Guangzhou, seizing thousands of iPhones and other equipment used to run the business. The city's transport commission said it suspected Uber was operating an illegal taxi service without a proper business registration and threatened fines of 30,000 yuan, or about $4,860, to those operating such services.
Uber faces multiples legal and regulatory challenges as it expands in the United States and abroad. In India, it has been banned in New Delhi, the southern technology hub of Hyderabad and the entire southern state of Karnataka.
The Chengdu official, who like many Chinese bureaucrats identified herself only by her surname, Ren, said she had no further information about the investigation there.
There was no listed telephone number for Uber's offices in Chengdu and a spokeswoman did not immediately return an email asking for comment.
The company, which is valued at $40 billion, allows passengers to summon taxi drivers in more than 250 cities around the world.
Such services have become hugely popular in China's congested cities, particularly those such as the capital Beijing and the financial hub of Shanghai where hailing a taxi on the street during rush-hour can be all-but-impossible.
A late arrival to the China market, Uber faces heavy competition from more established local apps backed by major investors. Most estimates put its share of the Chinese market at about 1 percent.
The AP contributed to this report.