P12A6: owner reports and bulletins

Powertrain (manufacturer-specific). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P12A6 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

6 complaints filed with NHTSA mention P12A6, 6 of them since 2015, across 5 different models. The component owners most often filed it under: electrical system.

Manufacturer service bulletins that name P12A6

38 technical service bulletins and manufacturer communications filed with NHTSA mention P12A6, from 4 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • GMC TERRAIN NA (2022, 2018, 2019, 2020), bulletin 10243751: This bulletin offers Information on Possible Crank No Start or Extended Crank with DTC P12A6 or Service Safety Restraints message on DIC, with B0073.
  • CHEVROLET EQUINOX (2018, 2019, 2020, 2021), bulletin 10243751: This bulletin offers Information on Possible Crank No Start or Extended Crank with DTC P12A6 or Service Safety Restraints message on DIC, with B0073.
  • CADILLAC ESCALADE ESV (2021), bulletin 10184497: This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
  • CHEVROLET SUBURBAN (2021), bulletin 10184497: This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
  • GMC YUKON (2021), bulletin 10184497: This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
  • CHEVROLET SILVERADO 1500 (2020, 2021), bulletin 10186086: This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.

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.