Service bulletins for the 2012 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.
230 on file from NHTSA, as of 2026-10-19.
About P0420 on the 2012 Hyundai Sonata: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P0420 are shown. Show all
| 5NP-V6G6F-10 | 2016-10-18. Service bulletin. ENGINE; ELECTRICAL SYSTEM:SOFTWARE. "THIS BULLETIN PROVIDES INFORMATION RELATED TO THE ENGINE CONTROL MODULE (ECM) SOFTWARE UPDATE TO PREVENT AN INCREASE IN THE CATALYST TEMPERATURE WHICH MAY RESULT IN ILLUMINATION OF THE MALFUNCTION INDICATOR LIGHT WITH THE FOLLOWING DTC(S): H P0171 - SYSTEM TOO LEAN - BANK 1. H P0420 - CATALYTIC CONVERTER SYSTEM, BANK 1 - EFFICIENCY BELOW THRESHOLD. IN RARE CASES, THERE CAN BE A REDUCTION IN ENGINE POWER IF THE CATALYST IS RESTRICTED." |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.