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P1327 on the 2020 Hyundai Elantra

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.

This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name P1327
26-01-039H DN2026-08-15. Service campaign. Certain Elantra (ADA) vehicles may have been incorrectly updated with Cylinder Noise Detection System (CNDS) software that can set DTC P132700; this software was intended only for Korean-built Elantra (AD) vehicles. In addition, the California Air Resources Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.
26-01-039H TSB2026-08-15. Service campaign. Certain Elantra (ADA) vehicles may have been incorrectly updated with Cylinder Noise Detection System (CNDS) software that can set DTC P132700; this software was intended only for Korean-built Elantra (AD) vehicles. This bulletin provides instructions to perform a software update for the Engine Control Module (ECM) to revert to the original ROM ID, apply the emissions label under the hood, and provide the vehicle owner with Proof of Correction.
22-EM-008H2022-06-10. Service bulletin. Hyundai is conducting a service campaign 974 to enhance the knock sensor logic with the Cylinder Noise Diagnostic System (CNDS) software update. CNDS is to detect abnormal cylinder wall scuffing or noise of the engine block before potentially severe engine damage occurs. If abnormal noise is detected, the Malfunction Indicator Lamp (MIL) will blink continuously. In addition, DTC P1327 will be recorded in the ECM.
22-01-043H2022-06-10. Service bulletin. Hyundai is conducting a service campaign to enhance the knock sensor logic with the Cylinder Noise Diagnostic System (CNDS) software update. CNDS is to detect abnormal cylinder wall scuffing or noise of the engine block before potentially severe engine damage occurs. If abnormal noise is detected, the Malfunction Indicator Lamp (MIL) will blink continuously. In addition, DTC P1327 will be recorded in the ECM.

4 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.