Tesla's Fremont plant is churning out poor quality parts and vehicles, according current and former employees.

California-based EV maker Tesla’s ongoing struggles with two major problems – executive retention and manufacturing quality – reared their ugly heads again this week.

The company saw two high-level executives, Susan Repo, Tesla’s corporate treasurer and vice president of finance, and Eric Branderiz, chief accounting officer, leave the company within about a week of one another.

Repo left to become the chief financial officer of another company and Branderiz left for personal reasons, according to reports.

Tesla’s senior team of executives has seen a pretty regular amount of turnover in the past few years, some citing burnout from working with the company’s founder and CEO Elon Musk, who’s known for keeping a pretty manic pace.

Tesla's Model 3 continues to confound the company's manufacturing experts.

(Tesla shut down Model 3 line – again – to make upgrades. Click Here for the story.)

Additionally, a new report reveals that the company continues to struggle producing the Model 3 on its predicted schedule of 5,000 units a month, in part, because current and former employees claim the company manufacturers a “high ratio of flawed parts and vehicles,” according to multiple reports.

The out-of-spec parts require time for rework and repair, causing space problems as well as extending production delays at Tesla’s factory in Fremont, California.

A current Tesla engineer estimated that 40% of the parts made or received at its Fremont factory require rework, according to CNBC. The need for reviews of parts coming off the line, and rework, has contributed to Model 3 delays, the engineer said.

The poor performance affects more than just the production schedule, it’s impacting employee morale as well. The automaker recently shut the plant down for a week last month as it attempted to improve the manufacturing process and equipment to get closer to its projected build rate.

(Click Here for more about Model 3 production delays.)

It’s unclear if the issues driving the stoppage were the quality problems or if new equipment has exacerbated the issue. The automaker, by Musk’s own admission, has been struggling with the implementation of tooling and processes to build the new Model 3.

To deal with a backlog of flawed parts and vehicles, Tesla has brought in teams of technicians and engineers to help with rework and repairs on site in Fremont, and some of the parts and vehicles are sent to a remanufacturing facility in Lathrop, California, about 50 miles away, instead of fixing those parts “in-line,” CNBC reported.

Tesla denied some of the claims while acknowledged the plant shutdowns and delays saying there will likely be more.

“Our remanufacturing team does not ‘rework’ cars,” a spokesperson said. The company said the employees might be conflating rework and remanufacturing. It also said every vehicle is subjected to rigorous quality control involving more than 500 inspections and tests.

(To see the first-ever bullet-proof Tesla Model S, Click Here.)

Tesla said that finished vehicles are inspected to ensure they meet certain specifications and those that don’t meet those specs have problems that minor and resolved quickly. Tesla also told CNBC the production levels have improved significantly: “Whereas before it took three shifts with considerable overtime to produce our target annual production of 100,000 Model S and X vehicles, now it can be done with only two shifts and minimal overtime.”

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