Other Fuel System Tank Assembly problems of the 2020 Chevrolet Silverado 2500

On approximately January 24, 2026 my 2020 Chevrolet Silverado 2500hd equipped with the 6. 6 duramax diesel displayed an error code (p20b9). This error code was found to be related to the diesel exhaust fluid system specifically relating to "reductant heater a control circuit/open. " on January 27, 2026, the vehicle was diagnosed at Chevrolet dealership and the following was reported "diesel emissions fluid tank remove and replace - p20b9 set for reductant heater circuit. . . Commanded on and zero amps. . Circuitfailure. . . Disconnect pump module and burned/overheated terminals. . Pump module and harness part of tank assembly. . . Labor time added to perform malfunction/tamper test to clear emissions message. . . . " I found the "burned/overheated terminals" comment to be alarming. I looked into this matter further and found a gm service bulletin (21-na-006) from October 2022. This bulletin identified this issue which contained an image showing burned/overheated terminals. The identified cause within the bulletin states "this condition may be caused by a poor connection at the emission reduction fluid tank electrical connector. " I believe this should upgraded to a safety recall due the the potential of this terminal connection catching fire which could be detrimental for the operator, passengers, property, and the public.

Vehicle is a diesel has about 13,000 miles on it only. Received a warning on the dash while vehicle was in motion that the def system has an issue and to see the owner manual. Says about 80 miles until max speed will only be 65 mph. Took to dealer and stated that it is the def pump in the tank. The part is almost impossible to get right now because it has been faulty on so many of these vehicles and has needed replacement. Have to leave vehicle at dealership until they can get a part in otherwise vehicle cannot be driven.