Rough idle in park on your 2016 Hyundai Santa Fe combined with code P0441 indicates a problem with the evaporative emission (EVAP) system that may be affecting engine operation. While P0441 relates to vapor purge, the issue can disrupt air-fuel mixture and cause rough idle.
Understanding P0441
Code P0441 indicates incorrect purge flow in the EVAP system. The EVAP system captures fuel vapors and purges them to the engine to be burned. When purge flow is incorrect - too much, too little, or at wrong times - it can disrupt the air-fuel mixture, especially noticeable at idle.
How EVAP Affects Idle
When the purge valve opens, fuel vapors enter the intake. If the valve is stuck open, it continuously adds fuel vapor, richening the mixture. If stuck closed, expected vapors don't arrive, affecting mixture calculations. Either condition can cause rough idle as the computer struggles to compensate.
Common P0441 Causes
EVAP system issues causing rough idle include purge valve stuck open or leaking internally, purge valve stuck closed (less likely to affect idle), vacuum leaks in EVAP hoses, charcoal canister saturation, and faulty EVAP pressure sensor giving incorrect readings.
Diagnostic Approach
Test the purge solenoid for proper operation - it should be closed when not energized and open when commanded. Check for vacuum at the purge valve when energized. Inspect EVAP hoses for cracks or disconnection. Listen for vacuum leak sounds around the EVAP components.
Repair Steps
If the purge valve is faulty, replacement is affordable and usually resolves both the code and rough idle. Vacuum leak repairs involve replacing damaged hoses. Charcoal canister replacement is needed if it's saturated. Clear the code after repairs and verify idle smooths out.