NHTSA ID Number: 10198888 Manufacturer Communication Number: 21NA120   Summary This technical bulletin provides the tech with a procedure to check if the transmission is the cause of the concern by checking the data.     4 Affected Products Vehicles MAKE MODEL YEAR CHEVROLET SILVERADO 2500 2020-2021 GMC SIERRA 2500 2020-2021   Condition Some technicians or customers ... Read more

The post Noise, Vibration, and/or Harshness Issues/Clunk Noise Heard During Coast Down Event – 2020-2021 Chevrolet Silverado & GMC Sierra 2500HD/3500HD first appeard on GM - OEMDTC and is written by oemdtc