Fuel Pump Folly for Chevy Silverado
This bulletin applies to 2014-2019 Chevy Silverado trucks. The vehicle may have a concern with a Service Engine Soon (SES) lamp on and a rich running condition DTC P0172 and P0175. The cause may be the high pressure fuel pump. If routine diagnostics do not isolate the cause, the following may be helpful:
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Disconnect the dirty air side of the PCV system.
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Plug the vacuum supply.
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Start the engine and monitor the fuel trim in closed loop.
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If the fuel trims return to normal, this is a good indicator that the high pressure fuel pump is leaking. Chevrolet reports that with this concern, they do not see a lot of fuel in the crankcase, so changing the oil may not isolate the concern. When the high pressure fuel pump leaks, the PCV will pull the fuel mist straight into the intake, causing the concern.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike MavrigianMike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
