P0442 on Your 2024 GMC Yukon
A P0442 code on your brand-new 2024 GMC Yukon points to a small evaporative emission system leak. On a current-model-year full-size SUV, this is almost always a minor issue with a simple fix — and it's fully covered under warranty.
EVAP System Details
The 2024 Yukon's gasoline engines (5.3L V8 or 6.2L V8) use GM's standard EVAP system with a purge solenoid valve, vent valve solenoid near the spare tire, and charcoal canister. The 3.0L Duramax diesel does not use a traditional EVAP system, so P0442 applies only to V8 models. The ECM detects leaks by sealing the system and monitoring pressure decay.
Likely Causes
- Gas cap not fully seated (45%) — The most common cause on any new vehicle. The cap may not have been clicked to its final position after fueling.
- Gasket debris (20%) — Dirt or contaminants on the gas cap gasket surface.
- Loose EVAP fitting (15%) — A factory connection that vibrated loose during initial driving.
- Vent valve solenoid defect (10%) — A rare factory defect in the vent valve near the spare tire.
- Purge solenoid valve defect (10%) — A manufacturing seal imperfection in the purge valve.
What to Do
Remove the gas cap, clean the gasket and filler neck, and reseat firmly until it clicks. If the code returns after a few drive cycles, bring your Yukon to a GMC dealer for warranty repair. The dealer's GDS2 system provides full EVAP diagnostic capability. Do not pay for any P0442 repairs on a 2024 model.
Cost Estimates (Reference Only)
- Gas cap replacement: $15–$40 ($0 under warranty)
- EVAP line repair: $100–$280 ($0 under warranty)
- Vent valve solenoid: $120–$270 ($0 under warranty)
- Purge solenoid valve: $130–$280 ($0 under warranty)
Full Warranty Coverage
Your 2024 Yukon is covered under GM's 3-year/36,000-mile basic warranty, 5-year/60,000-mile powertrain warranty, and federal 8-year/80,000-mile emissions warranty. All P0442 diagnosis and repair is covered at no cost.