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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 C1812 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: C1812 are shown. Show all

Bulletins, newest first
22-01-076H-12022-11-01. Service bulletin. ELECTRICAL SYSTEM. Some 2021 ~ 2022MY Elantra (CN7, CN7a, CN7 HEV) vehicles may exhibit a condition with multiple warning lights displayed on the instrument cluster and various symptoms; multiple DTCs (Diagnostic Trouble Code), reduction in power steering assist, and not able to shift out of Park. Possible DTCs set are: • C181287 – CAN Time-out Gateway • C181208 – CAN Time-out Gateway • C180581 – LKAS CAN Signal Error • C181887 – CAN Time-out BCA • B109052 – TCU Missing Error This bulletin provides the service procedure to update the ICU (Integrated Central Control Unit) software to resolve the conditions stated above.
22-01-076H2022-09-27. Service bulletin. POWER TRAIN. Some 2021 ~ 2022MY Elantra (CN7, CN7a, CN7 HEV) vehicles may exhibit a condition with multiple warning lights displayed on the instrument cluster and various symptoms; multiple DTCs (Diagnostic Trouble Code), reduction in power steering assist, and not able to shift out of Park. Possible DTCs set are: C181287 – CAN Time-out Gateway, C181208 – CAN Time-out Gateway, C180581 – LKAS CAN Signal Error, C181887 – CAN Time-out BCA, B109052 – TCU Missing Error This bulletin provides the service procedure to update the ICU (Integrated Central Control Unit) software to resolve the conditions stated above.
21-01-056H2021-08-07. Service bulletin. ELECTRICAL SYSTEM. Some 2021 Elantra (CN7) vehicles may exhibit a condition with multiple warning lights displayed on the instrument cluster and various symptoms; multiple DTCs (Diagnostic Trouble Code), reduction in power steering assist, and not able to shift out of Park. Possible DTCs set are: • C181287 – CAN Time-out Gateway • C181208 – CAN Time-out Gateway • C180581 – LKAS CAN Signal Error • C181887 – CAN Time-out BCA • B109052 – TCU Missing Error

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