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Service bulletins for the 2008 Hyundai Sonata

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

55 on file from NHTSA, as of 2026-10-19.

About P0638 on the 2008 Hyundai Sonata: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: P0638 are shown. Show all

Bulletins, newest first
TSB-10-FL-0102010-12-15. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. HYUNDAI: DTC P2135/P0638 OR COLD ENGINE RPM FLUCTUATION; TPS REPLACEMENT AND ECM UPDATE. SOME 2.7L, 3.3L OR 3.8L ENGINES IN MODELS IDENTIFIED IN THE APPLICABILITY LIST MAY EXPERIENCE ONE OR MORE OF THE CONDITIONS LISTED. *PE
TSB09-FL-003-22010-05-24. Service bulletin. EQUIPMENT:ELECTRICAL; ENGINE AND ENGINE COOLING:ENGINE. HYUNDAI: SOME VEHICLES MAY EXPERIENCE A MALFUNCTION INDICATOR LAMP ILLUMINATED WITH THE ETC (ELECTRONIC THROTTLE CONTROL) SYSTEM RELATED DTC P2135 ( FORCED LIMITED POWER) OR DTC P0638 (POWER MANAGEMENT). *PE
TSB-09-FL-003-12009-06-30. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING:ENGINE. HYUNDAI: MIL ON DTC P2135 OR P0638 OR COLD ENGINE RPM FLUCTUATION- TPS REPLACEMENT & ECM UPDATE. SOME VEHICLES MAY EXPERIENCE EITHER SLIGHT ENGINE RPM FLUCTUATION AT COLD WARM UP OR MALFUNCTION INDICATOR LAMP ILLUMINATED WITH THE ETC (ELECTRONIC THROTTLE CONTROL) SYSTEM. *PE
TSB-09-FL-0032009-06-01. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. HYUNDAI: SOME VEHICLES MAY EXPERIENCE A MALFUNCTION INDICATOR LAMP ILLUMINATED WITH THE ETC (ELECTRONIC THROTTLE CONTROL) SYSTEM RELATED DTC P2135 OR DTC P0638. *PE

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.