P0333: 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 P0333 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

5 complaints filed with NHTSA mention P0333, 4 of them since 2015, across 3 different models. The component owners most often filed it under: electrical system.

Most-reported models

VehicleComplaintsModel years reported
TOYOTA TACOMA32005, 2008, 2014

Manufacturer service bulletins that name P0333

12 technical service bulletins and manufacturer communications filed with NHTSA mention P0333, from 4 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • CHEVROLET SILVERADO 5500 (2020, 2019, 2016, 2017), bulletin 10209097: This service bulletin informs the technician to inspect for a possible electrical concern at the ECM X2 electrical connector to correct a customer concern of Malfunction Indicator Lamp (MIL) Illuminated - DTC P0333 Set. …
  • CADILLAC CTS (2016, 2017, 2018, 2019), bulletin 10209097: This service bulletin informs the technician to inspect for a possible electrical concern at the ECM X2 electrical connector to correct a customer concern of Malfunction Indicator Lamp (MIL) Illuminated - DTC P0333 Set. …
  • GMC SIERRA 1500 (2014, 2015, 2016, 2017), bulletin 10209097: This service bulletin informs the technician to inspect for a possible electrical concern at the ECM X2 electrical connector to correct a customer concern of Malfunction Indicator Lamp (MIL) Illuminated - DTC P0333 Set. …
  • CHEVROLET CAMARO (2016, 2017, 2018, 2014), bulletin 10183206: This service bulletin informs the technician to inspect for a possible electrical concern at the ECM X2 electrical connector to correct a customer concern of Malfunction Indicator Lamp (MIL) Illuminated - DTC P0333 Set.…
  • SUBARU FORESTER (2014, 2015, 2016, 2017), bulletin 10140468: 2.0L Turbor Models only. This Service Information Bulletin announces design changes to the engine?s knock sensor which will help improve vehicle assembly line efficiency and increase durability. In some cases, the Check …
  • SUBARU B9 TRIBECA (2012, 2013, 2014, 2015), bulletin 10153187: This Service Information Bulletin announces design changes to the engine?s knock sensor which will help improve vehicle assembly line efficiency and increase durability. In some cases, the Check Engine light may illumina…

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.