P0638 on the 2003 Kia Optima
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| TSB-044 | 2010-08-18. Service bulletin. KIA: ECM UPGRADE WITH TP SENSOR REPLACEMENT-MIL ON WITH DTC P2135/P0638. INFORMATION RELATED TO ECM SOFTWARE AND TP SENSOR UPGRADE ON SOME VEHICLES WITH 2.7L ENGINES WHICH MAY EXPERIENCE A MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH THE ELECTRONIC THROTTLE CONTROL (ETC) SYSTEM RELATED DTC P2135 OR P0638 OR P2A00 OR P2A03. *PE |
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1 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.