2007 Chevrolet Silverado 1500 VORTEC MAX with P0101, P2165, C0403, P0400, P0003, P2100, P0765 Codes - Help Needed
Hello, I'm new here but I believe I've found the right community. I own a 2007 Chevrolet Silverado 1500 LTZ Crew Cab, 2WD, VORTIC MAX 6.0L engine with automatic transmission, currently at 48,000 miles. The vehicle has undergone several modifications including cold air induction, descreened MAF sensor, dual exhaust system, and a computer retune performed on a dyno (all completed around 30,000 miles ago). About two weeks ago, the Check Engine light started illuminating. I've been using a car data logger device that plugs into the OBD-II port — it monitors real-time data and retrieves fault codes. Every time I run the system, I receive the same set of diagnostic trouble codes: P0101, P2165, C0403, P0400, P0003, P2100, and P0765. This is very concerning. The device reports airflow through the MAF sensor as 0 lbs to 0.2 lbs — which seems extremely low and abnormal. I suspect one or more of these codes may relate to the throttle position sensor (TPS), especially since C0403 appears to be an unknown chassis-related code. I recently installed new wheels and tires, but have not yet replaced any sensors. I'm looking for expert insight — is there a known connection between these specific codes and my modifications? Could the descreened MAF sensor or other mods be contributing to the issue? Any advice on where to start troubleshooting would be greatly appreciated. I’ve also attempted to attach the raw data from the car logger (if possible). Thank you in advance, PDP.
Descreening the MAF sensor can interfere with accurate airflow readings and may trigger or exacerbate fault codes like P0101 and P2165. It's important to verify fundamental systems such as fuel pressure, fuel volume, intake vacuum integrity, and for any leaks before assuming modifications are the root cause. Start with these basics — they often resolve issues that appear after performance upgrades.