Ford is recalling over 850,000 vehicles due to a potential low-pressure fuel pump failure, according to the National Highway Traffic Safety Administration, NHTSA.

Ford’s (NYSE:F) recall of 850,000 vehicles for a fuel pump defect marks the latest in a string of recalls that have raised fresh concerns about the automaker’s quality control and brings its six-month total higher than any other automaker’s full-year tally.

The automaker says its quality is improving, and the company expects its number of recalled vehicles to drop over time.

The NHTSA estimates that ~10% of the recalled vehicles have this specific defect. Before a fuel pump failure occurs, drivers might observe symptoms such as poor engine performance, such as misfiring, rough running, reduced power, or the illumination of the check engine light.

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