Staff at the paint shop were among those who tested positive, a whistleblower employee who asked not to be named told BirminghamLive.
A spokesperson for JLR said: “We can confirm that four employees based at our Solihull the manufacturing plant have tested positive for COVID-19 and are self-isolating.
“Through contact tracing and in collaboration with Public Health England we have identified anyone who has been in close contact with these people at work and they are self-isolating as well.
“The health of our workforce remains our primary concern and a thorough cleaning of the area has been undertaken. We continue to follow all advice from the government and the NHS. ”
The employee claimed that the workers were “dropping like flies”.
They added: “So far all cases have been in the paint shop, but loads of other staff come and go from there.
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“The cleaners go, the drivers, the staff from other departments – anyone can just go in and out and get the virus. ”
When production started at the factory after the lockdown, strict measures were put in place to protect workers’ health.
These included temperature controls, two-meter distance markers, face shields in sections where this is not possible, the introduction of one-way systems in factories, improved cleaning regimes and hand sanitizers.
“A thorough review of all production lines, engineering facilities, offices and common areas has been undertaken,” the JLR spokesperson said.
“It’s about creating a strong protocol and guidelines to ensure that effective social distancing, hygiene and health measures are in place as the company gradually returns to manufacturing.
“The health and well-being of employees are at the center of this plan and, with the implementation of the new protocol, employees will experience a significant number of changes in their working day as soon as they enter the site.
“We continue to monitor the COVID-19 situation and follow the advice of all relevant authorities in the markets in which we operate. “