P2493: 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 P2493 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 P2493, 1 of them since 2015, across 1 different models. The component owners most often filed it under: engine.

Manufacturer service bulletins that name P2493

4 technical service bulletins and manufacturer communications filed with NHTSA mention P2493, from 2 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • CHEVROLET SILVERADO 2500 (2015), bulletin 10113767: This preliminary informational bulletin provides repair information for a customer concern of Malfunction Indicator Lamp (MIL) illuminated with technician finding DTCs P24C4, P2493, P2495 and P06A3 present.
  • GMC SIERRA 2500 (2015), bulletin 10113767: This preliminary informational bulletin provides repair information for a customer concern of Malfunction Indicator Lamp (MIL) illuminated with technician finding DTCs P24C4, P2493, P2495 and P06A3 present.

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.