Solving P0446 on Your 2024 GMC Acadia
A P0446 code on your 2024 GMC Acadia signals an EVAP vent control circuit malfunction. The redesigned Acadia features GM's new 2.5L turbocharged four-cylinder on an updated platform. The ECM has detected a fault in the vent valve solenoid circuit.
Under full GM warranty, this is a dealer repair at no cost. As a completely redesigned model, first-year calibration updates may be available.
Symptoms Present
- Check engine light on with P0446
- Fuel fill difficulties
- EVAP readiness monitor incomplete
- P0449 companion code may be present
Likely Causes
- Vent Valve Solenoid Defect (High Likelihood): Manufacturing variation on the redesigned platform. Warranty-covered.
- ECM Software Calibration (High Likelihood): First-year redesign — EVAP monitoring calibration updates are likely. Warranty-covered.
- Purge Solenoid Issue (Medium Likelihood): New turbo engine may have purge valve calibration sensitivity. Warranty-covered.
- EVAP Circuit Connector (Medium Likelihood): Factory assembly issue. Warranty-covered.
- Gas Cap Seal (Low Likelihood): Factory fit. Warranty-covered.
What to Do
Take your Acadia to a GMC dealer. Under warranty, GDS2 diagnostics and all repairs are free.
Full Warranty
Your 2024 Acadia 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 Acadia's 2.5L turbo engine, 8-speed automatic, AWD, or any driving system.