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  1. General Discussion
    I have a 2015 3/4 ton Silverado. When the fuel level drops below around 3/4 tank my check engine light come on. When I fill the tank and drive a little bit, like home from the gas station, the next time I start my truck the light is off. It stays off until I get below 3/4 tank again. It...
  2. 2020+ GM T1 Platform Powertrain
    I have a new 2021 AT4 Duramax. I filled the DEF fluid for the first time (it has about 2300 miles on it) When I started it to leave the station, the check engine light was on. I drove it home (6 miles) and it didn't go off. Could this be related to filling the DEF tank. I guess it's possible...
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