P0777: 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 P0777 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

19 complaints filed with NHTSA mention P0777, 13 of them since 2015, across 12 different models. The component owners most often filed it under: power train.

Most-reported models

VehicleComplaintsModel years reported
JEEP PATRIOT42012, 2013, 2016
SATURN VUE32008

Manufacturer service bulletins that name P0777

7 technical service bulletins and manufacturer communications filed with NHTSA mention P0777, from 3 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • CHEVROLET SILVERADO 1500 (2016), bulletin 10078870: THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES THE TECHNICIAN WITH INFORMATION ON THE DIAGNOSTIC TROUBLE CODE P0777. IF THE DIAGNOSTIC TROUBLE CODE P0777 IS CURRENT IN THE TRANSMISSION CONTROL MODULE FOLLOW THE CURR…
  • GMC SIERRA 1500 (2016), bulletin 10078870: THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES THE TECHNICIAN WITH INFORMATION ON THE DIAGNOSTIC TROUBLE CODE P0777. IF THE DIAGNOSTIC TROUBLE CODE P0777 IS CURRENT IN THE TRANSMISSION CONTROL MODULE FOLLOW THE CURR…
  • CHEVROLET COLORADO (2015), bulletin 10113555: This preliminary informational bulletin provides diagnostic tips that may be helpful in correcting a customer concern of no forward movement of vehicle, and technicians may find DTC P0777 or P02723 set as an active or hi…
  • GMC CANYON (2015), bulletin 10113555: This preliminary informational bulletin provides diagnostic tips that may be helpful in correcting a customer concern of no forward movement of vehicle, and technicians may find DTC P0777 or P02723 set as an active or hi…
  • GMC YUKON (2010, 2011), bulletin 10154593: This Preliminary Information communication advises the technician that vehicles to look for debris in the valve bodu for codesP0751, P0752, P0756, P0757, P0776, P0777, P0796, P0797, P2714 or P2715, And to review the date…
  • CADILLAC ESCALADE (2010, 2011), bulletin 10154593: This Preliminary Information communication advises the technician that vehicles to look for debris in the valve bodu for codesP0751, P0752, P0756, P0757, P0776, P0777, P0796, P0797, P2714 or P2715, And to review the date…

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.