P0326: owner reports and bulletins

Powertrain (generic, all makes). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P0326 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

18 complaints filed with NHTSA mention P0326, 18 of them since 2015, across 10 different models. The component owners most often filed it under: engine.

Most-reported models

VehicleComplaintsModel years reported
KIA SOUL42014, 2016
HYUNDAI TUCSON42016, 2017, 2018
HYUNDAI ACCENT32012, 2013

Manufacturer service bulletins that name P0326

49 technical service bulletins and manufacturer communications filed with NHTSA mention P0326, from 9 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • GMC CANYON (2023, 2024), bulletin 11006404: This Preliminary information communicates to the technician there maybe a connection concern for the knock sensors at connector X160 if P0326 and or P0331 has set.
  • CHEVROLET COLORADO (2023, 2024), bulletin 11006404: This Preliminary information communicates to the technician there maybe a connection concern for the knock sensors at connector X160 if P0326 and or P0331 has set.
  • CADILLAC ESCALADE (2023), bulletin 10231896: This technical bulletin provides repair information to correct a customer concern of Possible Audible Knock Due to Reduced Knock Sensor Detection Capability DTC P0325, P0330, P0326, P0331, P06B6 or P06B7 May be Set in Hi…
  • VOLKSWAGEN GTI (2022, 2023), bulletin 10232747: ECM Update Programming for DTC P2407, P0326, P0442.
  • JEEP RENEGADE (2017), bulletin 10198418: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illu…
  • FIAT 500X (2017), bulletin 10121817: Flash: Powertrain Diagnostic and System Improvements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL…

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.