Solving P0446 on Your 2024 GMC Yukon
A P0446 code on your 2024 GMC Yukon indicates an EVAP vent control circuit malfunction. The T1-platform Yukon offers the 5.3L V8, 6.2L V8, or 3.0L Duramax diesel. Gas models use a vent valve solenoid controlled by the ECM. P0449 is the expected GM companion code.
Under full GM warranty, this is a dealer repair at no cost. GM's EVAP system is well-established with excellent dealer support and parts availability.
Symptoms Present
- Check engine light on with P0446
- Fuel fill issues
- EVAP readiness monitor incomplete
- P0449 companion code may appear
Likely Causes
- Vent Valve Solenoid Defect (High Likelihood): Manufacturing variation. Primary P0446 component. Warranty-covered.
- ECM Software Calibration (High Likelihood): EVAP monitoring updates. Warranty-covered.
- Purge Solenoid Issue (Medium Likelihood): Purge valve defect. Warranty-covered.
- EVAP Circuit Connector (Medium Likelihood): Factory assembly issue. Warranty-covered.
- Gas Cap Seal (Low Likelihood): Factory fit. Warranty-covered.
What to Do
Schedule a GMC dealer appointment. Under warranty, GDS2 diagnostics and all repairs are free.
Full Warranty
Your 2024 Yukon is covered by GM's 3yr/36k bumper-to-bumper, 5yr/60k powertrain, and federal emissions warranty (8yr/80k). All EVAP repairs are free.
Safe to Drive?
Yes. P0446 doesn't affect your Yukon's engine, 10-speed automatic, 4WD, towing capacity, air suspension, or luxury features.