P CODES (POWERTRAIN) P0400 - P0499

Trying To Pass Emissions Test Failed Once Code P0449 Changed Charcoal Canister, Vapor Canister Vent Solenoid, Gas Cap, Cleaned Corrosion...

I Need Help Identifying What Parts I Need. All Information Online Is For Yukon Xl 1500 Or Other That Do Not Match My 2004 Yukon Xl 2500....

Check Engine Light Came On. Had It Checked And It States; P0442 Evap System Small Leak (0.040") Detec0.020ted. P0456 Evap System...

This Code Appeared Obdii System. I Know This Involves A Malfunctioning Canister Purge Solenoid. However, I Cannot Find It On This Truck. I...

Catalyst System Efficiency Below Threshold Bank 2. How Would You Start To Pin-point This?

Vehicle Is Throwing P0420, Catalytic Converter Was Replaced Last Year (but Son Drove It Around Campus For Months With Code Returned). Live...

Is It Possible That The Air Pump Not Put Out Enough Air? I Replaced It And Also Replace The Back Check Valve. The Service Engine Light...

I Have A P0411 Code And I Was Wondering Where The Secondary Air Injection Pump Is Located. Secondary Air Injection. Upstream Detected. I...

The Engine Light Came On. I Used A Code Key Reader And Found P0446 And P0446(pd) Error Codes. I Checked The Hose Coming Out Of The Back Of...

P0430 Says Catalyst System Efficency Below Threshold Bank 2.