P0843: 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 P0843 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 P0843, 5 of them since 2015, across 6 different models. The component owners most often filed it under: power train.

Manufacturer service bulletins that name P0843

14 technical service bulletins and manufacturer communications filed with NHTSA mention P0843, from 3 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • CHEVROLET redundant SILVERADO 2500 (2001, 2002, 2003, 2004), bulletin 10145478: This Preliminary Information communication provides information to the technician about vehicles that have not engagement into drive, delayed, no engagement into reverse, and or a range inhibit. Technician may find Diagn…
  • GMC SIERRA 1500 (2019, 2001, 2002, 2003), bulletin 10145478: This Preliminary Information communication provides information to the technician about vehicles that have not engagement into drive, delayed, no engagement into reverse, and or a range inhibit. Technician may find Diagn…
  • CHEVROLET CONVENTIONAL (2003, 2004, 2005, 2006), bulletin 10125963: This Preliminary Information communication provides information to the technician about vehicles that have not engagement into drive, delayed, no engagement into reverse, and or a range inhibit. Technician may find Diagn…
  • GMC C SERIES (2004, 2005, 2006, 2001), bulletin 10125963: This Preliminary Information communication provides information to the technician about vehicles that have not engagement into drive, delayed, no engagement into reverse, and or a range inhibit. Technician may find Diagn…
  • GMC G SERIES (2003, 2004, 2005, 2006), bulletin 10125942: This Preliminary Information communication provides information to the technician about vehicles that have not engagement into drive, delayed, no engagement into reverse, and or a range inhibit. Technician may find Diagn…
  • CHEVROLET KODIAK (2003, 2004, 2005, 2006), bulletin 10112401: This Preliminary Information communication provides information to the technician about vehicles that have not engagement into drive, delayed, no engagement into reverse, and or a range inhibit. Technician may find Diagn…

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.