Chevy 2024 Silverado 2024 Duramax Def. Take a look at what has changed, and the other. Depending on the temp/humidity where you live, def crystallizes on the sensor and shows as if the tank is full/half, even though the actual level is lower.
General motors has released a crucial service bulletin addressing specific issues related to the malfunction indicator lamp (mil) and diesel exhaust fluid (def) level sensor. Keep your egr serviced (cleaned).