General Motors has issued a service update for certain 2021 Chevy Silverado HD and 2021 GMC Sierra HD pickups that may have been delivered with a damaged diesel nitrogen oxide sensor.. The problem ...

2021 Chevy 3500 6.6 Duramax. 3900+ miles DEF Sensor engine code. Dealer had for over a week. 13000 miles NoX Sensor issue, have taken to dealer 3 times and still no fix. 1st time dealer had 1 week ...