P0027: 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 P0027 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 P0027, 1 of them since 2015, across 1 different models. The component owners most often filed it under: engine.

Manufacturer service bulletins that name P0027

1 technical service bulletins and manufacturer communications filed with NHTSA mention P0027, from 1 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • ISUZU F SERIES, bulletin 10172508: VEHICLES PRODUCED PRIOR TO JANUARY 2, 2019 SOME CUSTOMERS MAY COMPLAIN ABOUT AN ILLUMINATED CHECK ENGINE LIGHT SETTING SHORTLY AFTER STARTING THE ENGINE. IF THE REASON FOR THE CHECK ENGINE LIGHT ILLUMINATING IS DTC P0027…

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.