Examining P0456 on Your 2020 Murano
Your 2020 Murano (3rd generation, Z52) has triggered P0456—a very small EVAP leak at 0.020 inches. The midsize crossover's 3.5L VQ35DE V6 with CVT uses Nissan's EVAP system with the dedicated leak detection pump. At 5–6 years old, emissions warranty may still cover the repair.
Clues
- Check engine light on
- P0456 stored
- No performance symptoms
- AWD (if equipped) works normally
- Gas cap may show wear
Causes Ranked
- Gas Cap Seal (High Likelihood): Worn after 5+ years. $10–$15.
- EVAP Leak Detection Pump (High Likelihood): Nissan-specific. Known failure point. $180–$300.
- Purge Volume Control Valve (Medium Likelihood): VQ35 heat over time. $120–$230.
- Canister Close Valve (Medium Likelihood): Age-related. $130–$240.
- Charcoal Canister (Low Likelihood): Fuel overfilling. $200–$380.
Diagnostic Steps
- Replace gas cap ($10–$15)
- Clear code and drive 50+ miles
- Test leak detection pump if code returns
- Check PVCV and canister close valve
- Smoke test for persistent micro-leaks
Costs
- Gas cap: $10–$15
- Leak detection pump: $180–$300
- PVCV: $120–$230
- Canister close valve: $130–$240
- Charcoal canister: $200–$380
Can I Drive?
Yes. P0456 has zero impact on the Murano's V6, CVT, AWD, or any feature.
Warranty
Nissan's 3yr/36k expired around 2023. Federal emissions (8yr/80k) covers EVAP through 2028. VQ35 EVAP parts are shared with Altima, Maxima, and Pathfinder.