I believe the U.S. government sent a preliminary investigative letter related to this sometime around 2009, but I don't remember whether there was any follow-up. (It was understood as laying the groundwork for a potential WTO complaint.)
Edit: here is a later article arguing the same theory: http://www.ecipe.org/app/uploads/2014/12/protectionism-onlin...
European countries have a large trade deficit with China (€170B)[1]. The U.S. had about double the amount of trade deficit ($336B), mostly due to its greater value of imports [2].
This doesn't prove that China restricts access to its markets by European companies, but it provides evidence that the situation may not be as simple as you suggest.
1. http://ec.europa.eu/eurostat/documents/2995521/7553974/6-120...
2. https://ustr.gov/countries-regions/china-mongolia-taiwan/peo...
Routers (Cisco), farm equipment (Caterpillar), software (AutoCAD, Microsoft, Oracle, etc), medical devices (GE), factory equipment (GE), microchips (AMD, Intel, Qualcomm), high-precision measurement (Agilent/Keysight), etc.
The list is absurdly long. Your agenda is preventing you from seeing a more balanced view of things. Try to read a bit about cooperation between the two countries, such as huge foreign investment in Shenzhen, exchange programs between Chinese and American universities, success of Chinese technology firms in the U.S. (Huawei, Nexus 6P; Almost all solar panel companies; etc)
So your argument seems to be built on a faulty premise that the two geographic industries are comparable yet one is silent... one is largely silent for another reason.