Hey all! I have a 2015 Silverado 1500 thats throwing the P1075 P1072 Rich codes. I replaced the filer, cleaned the Mass airflow sensor. It will lurch sometimes and shift hard, run for a few seconds after key off but the fuel trims arent bad. LTFT is roughly -6 and the short tern is between 0 and +3. Any ideas thanks!

 

fuel trim data is “created” by the upstream o2 sensor(s) in most cars. With a warm engine, watch upstream o2 data for both banks. It should oscillate between 100mA and 900mA, low milliamp is lean, high milliamp is rich.


Run a cylinder power balance test. Since this is affecting both banks I would suggest fuel pressure issues, MAP sensor or circuit, etc