Service bulletins for the 2021 Hyundai Elantra
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.
96 on file from NHTSA, as of 2026-10-19.
About P1CD0 on the 2021 Hyundai Elantra: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P1CD0 are shown. Show all
| 21-01-043H | 2021-06-10. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides information related to the Engine Control Module (ECM) software update for 2021MY Elantra (CN7/CN7A) vehicles equipped with the 2.0L engine to update the ECM logic for the following conditions and DTCs: • Incorrect learning of the fuel adaptive values can occur if the engine is started at 14⁰F (-10⁰C) or colder ambient temperatures. If incorrect values are learned, the engine may stall when coming to a stop or at idle. DTC P016C: Closed Loop Air/Fuel Ratio Control at Limit-System Too Lean may be detected. The ECM software revises the logic for fuel adaptation learning and improves engine performance at idle. • The ECM software also revises the blower motor control duty cycle logic for DTC P1CD0: Air Blower Motor Inverter Performance. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.