This week, 3 Auto Components stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Gentherm Incorporated’s (THRM) rating worsens to a F from the company’s D rating a week ago. Gentherm Incorporated develops and markets high-technology products for automotive original equipment manufacturers. The company also gets F’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of THRM stock.

Metaldyne Performance Group, Inc. (MPG) declines this week from a C to a D. Metaldyne Performance Group, Inc. is a real estate investment trust that owns and operates Class A office properties in the Los Angeles central business district in California. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of MPG stock.

Modine Manufacturing Company (MOD) slips from a C to a D this week. Modine Manufacturing Company specializes in thermal management systems and components, bringing heating and cooling technology and solutions to diversified global markets. The company also gets F’s in operating margin growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of MOD stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.