P0401 — Exhaust gas recirculation (EGR) flow insufficient

Code P0401 is a standard OBD-II diagnostic trouble code: Exhaust gas recirculation (EGR) flow insufficient.

In our record, P0401 is reported most often on Chevrolet, Ford and Hyundai vehicles , against engine and powertrain failure patterns , across 2005–2023 model years.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P0401 across 13 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report P0401 13 patterns

2023 Ford Maverick

powertrain — Sudden loss of power and limp mode activation with downshift to 25–35 mph

2019 Hyundai Santa Fe

engine — Excessive Oil Consumption / Burning

2017 Chevrolet Volt

powertrain — Engine Overheating (EGR-Related)

2017 Chevrolet Volt

engine — EGR Valve Failure – Sticking/Internal Short

2016 Hyundai Sonata

electrical — Engine Stalling and Power Loss While Driving

2015 RAM Promaster City

powertrain — Unintended neutral shift, limp mode, and power loss

2013 Ford F-250

engine — EGR Cooler & EGR Valve Failures

2013 Hyundai Veloster

powertrain — Engine Misfiring and Coil Pack Failure

2010 Toyota Prius

powertrain — EGR Valve Sticking - Cold Start Rough Idle

2008 Chevrolet Suburban

engine — Excessive oil consumption and internal engine degradation

2008 Mazda CX-7

engine — Engine sludge and total engine failure

2006 Ford F-250

electrical — Instrument cluster failure

2005 Chevrolet Equinox

engine — Head Gasket Failure

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →