P1327 Hyundai and Kia: the engine noise monitoring logic has detected piston ring or cylinder wall damage

Piston/cylinder noise detected (Hyundai/Kia)

P1327 in short

On Hyundai and Kia vehicles, P1327 means the engine noise monitoring software, which uses the knock sensor, has detected piston ring or cylinder wall damage. The usual dealer fix is a replacement engine, not a sensor. Treat it as serious: stop driving normally and contact a dealer, since engine campaigns may cover it.

Some Hyundai and Kia engines (the 2.0L Nu engine in the Elantra, Kona and Veloster, and engines in the Soul and Seltos) were found to have piston ring problems that can damage the cylinders. Hyundai and Kia added software that uses the existing knock sensor to listen for the noise that this damage makes.

When the software hears abnormal noise, it stores P1327. On Hyundai the check engine light blinks continuously. Kia's follow-up bulletin says that if P1327 is present after the software update, the engine long block is replaced.

The knock sensor is only the microphone here; replacing it does not fix P1327. Owners report dealers confirming P1327 and replacing the engine, and some report stalling or sudden power loss. Kia also recalled some Soul and Seltos engines (21V-259) for piston oil rings that can cause engine damage, stalling and an oil-fed fire risk; that recall does not name P1327.

Pick your make

P1327 is a manufacturer-specific code: its meaning depends on who built the car.

Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.

Most likely causes

  1. Piston ring damage (2020–2021 Kia Soul and Seltos)

    Supported by vehicle data
    Why it ranks here
    Kia bulletins give engine replacement instructions for piston ring noise P1327 after the software update, and owners quote the readout.
    What would change this
    Rises on a 2020–2021 Soul or Seltos with the PNSS software installed.

  2. Cylinder wall scuffing or engine block noise (2019–2021 Hyundai Elantra, Kona, Veloster 2.0L)

    Supported by vehicle data
    Why it ranks here
    Hyundai's campaign software sets P1327 for abnormal cylinder scuffing, and owners report dealers confirming P1327 and replacing the engine.
    What would change this
    Rises on a 2.0L Elantra, Kona or Veloster with a blinking check engine light.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Note whether the check engine light is blinking, and whether there is knocking, stalling or power loss. Do not clear the code.

    Low risk

    • IfA Hyundai with a blinking check engine light

      It meansThis matches the CNDS warning; contact a dealer.

      Go to step 2

    • IfA Kia Soul or Seltos

      It meansKia's piston ring bulletins apply; contact a dealer.

      Go to step 2

  2. Have a Hyundai or Kia dealer confirm P1327 and check your VIN for engine campaigns, recalls and warranty extensions.

    Best left to a shopTool: dealer diagnostic equipment

    Warning:Dealer job. Engine damage diagnosis and replacement follow the maker's campaign procedures.

Symptoms

  • Check engine light blinking continuously Gets more serious: stop and have it checked.
  • Knocking or abnormal noise from the engine Gets more serious: stop and have it checked.
  • Stalling or sudden loss of power Gets more serious: stop and have it checked.

How to fix

We don't give DIY repair steps for a Stop code. Get the car inspected before you drive it; the tests above help you understand what a technician will check.

Parts and cost context

  • Knock sensor:The knock sensor is how the software hears the damage; replacing it does not fix P1327. The documented repair is engine replacement under the maker's campaign.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Hyundai

  • 2019–2021 · Kona · 2.0L Nu

    Supported by vehicle data

    Hyundai 22-01-043H adds CNDS software to the 2.0L Nu engine in the Elantra, Kona and Veloster; P1327 sets with a blinking check engine light when cylinder damage is detected. Owners of 2020 Konas report dealers confirming P1327 and replacing the engine. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Knock sensor on the engine block

  • 22-01-043HStatus unverified

    Knock sensor logic update with the Cylinder Noise Diagnostic System (CNDS)

    2019–2021elantra, kona, veloster · issued · NHTSA 10213718

    Service campaign to update knock sensor logic with CNDS software, which detects abnormal cylinder wall scuffing or engine block noise before severe engine damage. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 22-EM-008HStatus unverified

    Campaign 974: knock sensor logic update with CNDS

    2019–2021elantra, kona, veloster · issued · NHTSA 10213724

    Service campaign 974 to update knock sensor logic with CNDS software, the same campaign as 22-01-043H. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Kia

  • 2020–2021 · Soul

    Supported by vehicle data

    Kia SC209Y gives engine long block replacement instructions when P1327 is present after the PNSS logic update; the 2021 Seltos is also covered. Kia recall 21V-259 for piston oil rings is related context but does not name P1327. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • 2021 · Seltos

    Supported by vehicle data

    Owners of 2021 Seltos report P1327 after the PNSS software, and one reports sudden power loss at highway speed with it. This comes from owner complaints to NHTSA that quote a shop or dealer readout, so it is labelled vehicle data rather than confirmed.

  • SC209Y_TSB_R2Status unverified

    Engine replacement instructions for piston ring noise DTC P1327 (SC209Y)

    2020–2021seltos, soul · issued · NHTSA 11001836

    Subsequent repair action: engine replacement instructions for piston ring noise DTC P1327, revised with additional information. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P1326Hyundai and Kia: the knock sensor detection system (KSDS) has picked up vibration that matches abnormal connecting rod bearing wear

    Same system Possible — needs testing

    P1326 is the related Hyundai and Kia knock sensor software alert for connecting rod bearing wear; P1327 is for piston ring or cylinder damage. Both use the knock sensor to listen for internal engine damage.

All Ignition and engine position sensors codes

P1327 questions

Will a new knock sensor fix P1327?

No. The knock sensor is only how the software hears the damage. Hyundai and Kia treat P1327 as a sign of piston ring or cylinder damage, and Kia's instruction is a replacement engine.

Sources and review

  1. Hyundai 22-01-043H: Campaign 974 knock sensor logic enhancement with Cylinder Noise Diagnostic System (CNDS) — Hyundai Motor America (read via CarComplaints.com mirror) ,
  2. Kia SC209Y: engine replacement instructions for piston ring noise DTC P1327 — Kia America (read via CarComplaints.com mirror) ,
  3. NHTSA complaint 11651114: 2020 Hyundai Kona, stall and P1327 — NHTSA Office of Defects Investigation
  4. NHTSA complaint 11731229: 2021 Kia Seltos, P1327 loss of power — NHTSA Office of Defects Investigation
  5. Kia SC209Y_TSB_R2: engine replacement instructions for piston ring noise DTC P1327 (revision 2) — Kia America ,
  6. NHTSA complaint 11720885: 2021 Kia Seltos, P1327 PNSS — NHTSA Office of Defects Investigation
  7. NHTSA complaint 11759509: 2020 Hyundai Kona, P1327 engine replacement — NHTSA Office of Defects Investigation
  8. Hyundai 22-EM-008H: Campaign 974 knock sensor logic enhancement (CNDS) — Hyundai Motor America ,
  9. Kia recall 21V-259: 2020 Soul piston oil ring heat treatment — CarWhere (NHTSA recall data, read via carwhere.com)
  10. NHTSA complaint 11574075: 2020 Kia Soul, P1327 PNSS — NHTSA Office of Defects Investigation
Last reviewed
Written by
Saurabh K.
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