One major factor could make Chipotle's comeback impossible

Chipotle is facing a huge roadblock to its comeback: Many customers still don't trust the chain. 

American's perception of the chain's food quality and trustworthiness still hasn't recovered from its 2015 E. coli outbreak, according to a survey by investment bank Cowen & Cowen released Friday.

In 2015, 69% of the general population thought of Chipotle as above average or higher in terms of food quality and trustworthiness, according Cowen's survey of 2,500 respondents. This figure plunged to 53% after the E. coli outbreak was first reported in late 2015.

The public's perception hasn't recovered much over the last two years. As of August, just 47.2% of the general population saw Chipotle as above average or higher in terms of food quality and trustworthiness.

RELATED: Check out the evolution of Chipotle: 

21 PHOTOS
Chipotle restaurants through the years
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Chipotle restaurants through the years
DENVER, CO - FEBRUARY 9: Steve Ells, 32, owner of the Chipotle Mexican Grill restaurant chain, in front of one of his stores at 32nd & Lowell Blvd. in Denver, Colorado on Monday, Feb. 9, 1998. (Photo by Hyoung Chang/The Denver Post via Getty Images)
Exterior of the Chipotle restaurant on Wisconsin Ave. NW Washington, D.C. (Photo by Michael Williamson/The Washington Post/Getty Images)
GLENVIEW, IL - DECEMBER 02: Activity is seen near the order-counter area inside a Chipotle restaurant December 2, 2005 in Glenview, Illinois. McDonald's Corp., owners of 92 percent of Chipotle, are preparing its Mexican-style eateries for an initial public offering. (Photo by Tim Boyle/Getty Images)
CHICAGO - JANUARY 26: The Chipoltle Mexican Grill logo is painted on the door of one of the Chain's restaurants in the trendy Bucktown neighborhood January 26, 2006 in Chicago, Illinois. McDonald's spin-off of the restaurant chain ended the day with the Initial Public Offering (IPO) closing at $44, double its opening price. It was the best opening day gain by a U.S.-based IPO in more than five years. (Photo by Scott Olson/Getty Images)
UNITED STATES - JANUARY 26: Workers prepares meals at Chipotle Mexican Grill in West Bloomfield, Michigan on Thursday, January 26, 2006. Chipotle Mexican Grill Inc.'s shares more than doubled on the first day of trading after McDonald's Corp. took the fast-growing chain public. (Photo by Jeff Kowalsky/Bloomberg via Getty Images)
DENVER, CO - JANUARY 26: The original Chipotle restaurant at 1644 E. Evans Ave in Denver, shown here on Jauary 26, 2006. (Photo by Cyrus McCrimmon/The Denver Post via Getty Images)
A Chipotle burrito in it's signature aluminum wrap on Friday, February 12, 2010. Burrito was that the original location on E. Evans Ave. Cyrus McCrimmon, The Denver Post (Photo By Cyrus McCrimmon/The Denver Post via Getty Images)
Chipotle burritos at the original location on E. Evans Ave. Bryan Sawyer who eats about 3 times a week at the Chipotle eats a steak black bean burrito on Friday, February 12, 2010. Cyrus McCrimmon, The Denver Post (Photo By Cyrus McCrimmon/The Denver Post via Getty Images)
Gregory Rec/Staff Photographer: -- Kyle Braley stirs a tomatillo green chili salsa at Chipotle Mexican Grill in South Portland on Monday, December 13, 2010. The popular restaurant chain, which serves naturally-raised beef, chicken and pork, has its grand opening today. (Photo by Gregory Rec/Portland Press Herald via Getty Images)
A pedestrian walks into a Chipotle Mexican Grill Inc. location in New York, U.S., on Wednesday, Oct. 17, 2012. Chipotle, the best- performing restaurant stock in the Standard & Poor's 500 Index last year, is expected to release earnings data on Oct. 18. Photographer: Scott Eells/Bloomberg via Getty Images
The Chipotle Mexican Grill Inc. logo is displayed on a paper bag at a location in New York, U.S., on Wednesday, Oct. 17, 2012. Chipotle, the best- performing restaurant stock in the Standard & Poor's 500 Index last year, is expected to release earnings data on Oct. 18. Photographer: Scott Eells/Bloomberg via Getty Images
Chipotle Mexican Grill Inc. employees prepare food at a location in New York, U.S., on Wednesday, Oct. 17, 2012. Chipotle, the best- performing restaurant stock in the Standard & Poor's 500 Index last year, is expected to release earnings data on Oct. 18. Photographer: Scott Eells/Bloomberg via Getty Images
A steak burrito is arranged for a photograph with a drink and bags of chips at a Chipotle Mexican Grill Inc. restaurant in Hollywood, California, U.S., on Tuesday, July 16, 2013. Chipotle Mexican Grill Inc. is scheduled to release earnings data on July 18. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
A employee sprinkles cheese on a burrito at a Chipotle Mexican Grill Inc. restaurant in Hollywood, California, U.S., on Tuesday, July 16, 2013. Chipotle Mexican Grill Inc. is scheduled to release earnings data on July 18. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
Employees prepare lunch orders at a Chipotle Mexican Grill restaurant at Madison Square Park in New York, U.S., on Wednesday, Jan. 29, 2014. Chipotle Mexican Grill Inc. is expected to release earnings figures on Jan. 30. Photographer: Craig Warga/Bloomberg via Getty Images
Employees prepare lunch orders at a Chipotle Mexican Grill restaurant at Madison Square Park in New York, U.S., on Wednesday, Jan. 29, 2014. Chipotle Mexican Grill Inc. is expected to release earnings figures on Jan. 30. Photographer: Craig Warga/Bloomberg via Getty Images
MIAMI, FL - MARCH 05: A Chipotle restaurant is seen on March 5, 2014 in Miami, Florida. The Mexican fast food chain is reported to have tossed around the idea that it would temporarily suspend sales of guacamole due to an increase in food costs. (Photo by Joe Raedle/Getty Images)
A Chipotle eatery in the Financial District of Manhattan NYC viewed from the outside looking in shows the interior design as well as people eating & talking, & also reflects the urban building from across the street in the upper left corner of the window
NEW YORK CITY, NEW YORK, UNITED STATES - 2015/10/18: Restaurants in USA: Chipotle Mexican Grill Chipotle Mexican Grill, Inc. is a chain of restaurants in the United States, United Kingdom, Canada, Germany, and France, specializing in Mission burritos and tacos. (Photo by Roberto Machado Noa/LightRocket via Getty Images)
NEW YORK, NEW YORK -- FEBRUARY 8: A sign sits in the window of a Chipotle restaurant on Broadway in Lower Manhattan telling customers the restaurant is closed until 3 p.m. on February 8, 2016 in New York City. The Mexican food chain is closing stores for lunch nationwide for a meeting on food safety following a number of E. coli outbreaks. (Photo by Andrew Renneisen/Getty Images)
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"We believe driving material upside to investor same store sales expectations has become increasingly difficult given that food quality was the brand’s legacy differentiation," the analyst, Andrew M. Charles, wrote in the note, which downgraded Chipotle shares to underperform from market perform. 

"Further, we believe the proliferation of fast casual competition that have replicated Chipotle’s playbook of an assembly line service format for speed, and high quality 'food with integrity' positioning across different cuisines present added challenges to improving quality perceptions," Charles continued. 

While Chipotle has positioned queso, which will debut nationwide on September 12, as a solution to its ongoing sales slump, Cowen analysts were unconvinced. With quality perception at such low rates, they argue that Chipotle can't rely on an "indulgent" item such as queso to drive sales and repair its reputation. 

Chipotle shares dropped 3.78% as of 1 p.m. ET on Friday after Cowen downgraded the company. 

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