P0243: 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 P0243 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

1 complaints filed with NHTSA mention P0243, 1 of them since 2015, across 1 different models. The component owners most often filed it under: engine.

Manufacturer service bulletins that name P0243

6 technical service bulletins and manufacturer communications filed with NHTSA mention P0243, from 2 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • FORD BRONCO SPORT (2021, 2022, 2020, 2019), bulletin 10208111: Some 2019-2022 Edge/Nautilus, 2020-2022 Escape/Corsair, and 2021-2022 Bronco Sport vehicles equipped with a 2.0L EcoBoost or 2.3L EcoBoost may exhibit a lack of power with an illuminated malfunction indicator lamp (MIL) …
  • LINCOLN CORSAIR (2020, 2021, 2022, 2019), bulletin 10208111: Some 2019-2022 Edge/Nautilus, 2020-2022 Escape/Corsair, and 2021-2022 Bronco Sport vehicles equipped with a 2.0L EcoBoost or 2.3L EcoBoost may exhibit a lack of power with an illuminated malfunction indicator lamp (MIL) …
  • LINCOLN NAUTILUS (2019, 2020, 2021), bulletin 10186564: Some 2019-2020 Edge/Nautilus/Ranger, 2020 Escape and 2020-2021 Corsair/Explorer vehicles equipped with a 2.0L/2.3L EcoBoost may exhibit a lack of power with an illuminated malfunction indicator lamp (MIL) with diagnostic…
  • FORD EDGE (2019, 2020, 2021), bulletin 10186564: Some 2019-2020 Edge/Nautilus/Ranger, 2020 Escape and 2020-2021 Corsair/Explorer vehicles equipped with a 2.0L/2.3L EcoBoost may exhibit a lack of power with an illuminated malfunction indicator lamp (MIL) with diagnostic…

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.