WASHINGTON — The National Highway Traffic Safety Administration has closed an investigation into 241,279 Volkswagen and Audi TDI clean diesel vehicles after looking into consumer complaints of high-pressure fuel pump failure.
NHTSA investigated 713 complaints that failure of the high-pressure fuel pump drivetrain causes contamination of the fuel system with debris from pump wear, which results in rough engine, loss of power and possible engine stall.
There have been no reports of crashes, injuries or fatalities linked to the alleged defect.
"Volkswagen believes that misfueling with gasoline is the primary cause of HPFP drivetrain failures in the field," NHTSA said in its summary of the probe. "Only the Q7 vehicles were built with misfuel protection devices."
In May 2013, VW initiated a service campaign to install misfuel protection devices in all 2009-'12 Jetta, Golf and A3 vehicles.
NHTSA said: "Analysis of the HPFP drivetrain failure incidents indicates that most failures do not result in engine stall while driving and, when pump drivetrain failure does result in stall while driving, it is usually preceded by numerous warning symptoms.
"The failure data for the subject vehicles show relatively low stalling rates (less than one percent at three years in service) for each of the pump designs used in the subject vehicles."
It added: "Based on these facts, the investigation is closed."
Edmunds says: This investigation closes without any vehicle recall. If you own one of these vehicles and continue to have a concern, it's best to contact your dealer.