P0638 — OBD-II trouble code

A generic powertrain OBD-II trouble code. Below are the vehicles and failure patterns where owners report it, drawn from NHTSA complaints.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P0638 across 10 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 P0638 10 patterns

2018 Hyundai Sonata

cruise control — Unintended acceleration / acceleration control malfunction

2015 Ford Explorer

cruise control — Loss of Power / Sudden Deceleration & Stalling

2015 Jeep Patriot

powertrain — Throttle body malfunction / limp mode engagement

2013 Kia Sorento

powertrain — Throttle body and intake manifold issues

2011 Kia Sedona

engine — Engine stall and loss of power with check engine light

2010 Volkswagen Jetta

engine — Stalling on clutch engagement or during low-load transitions (TDI manual transmission)

2009 Volkswagen Jetta

engine — High-Pressure Fuel Pump (HPFP) Failure with Metal Debris

2008 Hyundai Santa Fe

powertrain — Electronic Throttle Control (ETC) system malfunction

2008 Kia Sedona

electrical — Intermittent No-Start / No-Crank

2005 Subaru Outback

cruise control — Accelerator Pedal Loss of Response / Limp Mode

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 →