P0456 on Your 2020 Ram 1500: Following the Evidence
Your 2020 Ram 1500 (DT) has triggered P0456—a very small EVAP leak. The 5.7L HEMI, 3.6L V6, or 3.0L EcoDiesel uses a Stellantis EVAP system with NVLD. Basic warranty expired. Federal emissions (8yr/80k) covers through 2028.
Clues
- Check engine light on
- P0456 stored
- No performance symptoms
- Gas cap may show wear after 5+ years of truck use
Suspects
- Gas Cap Seal (High Likelihood): Five years of work/trail use. $10–$15.
- NVLD Sensor (High Likelihood): Age-related. Under emissions warranty or $130–$300.
- Purge Solenoid Valve (Medium Likelihood): HEMI heat cycling. Under emissions warranty or $110–$260.
- EVAP Hose (Medium Likelihood): Under-bed deterioration. $130–$270.
- Charcoal Canister (Low Likelihood): Fuel overfilling. $220–$420.
Diagnostic Steps
- Replace gas cap—$10–$15
- Clear code, drive 2–3 cycles
- Check federal emissions warranty—8yr/80k through 2028
- Dealer wiTech diagnostics for NVLD
- Smoke test if out-of-pocket ($80–$150)
Costs
- Gas cap: $10–$15
- NVLD sensor: $130–$300
- Purge valve: $110–$260
Can I Drive?
Yes. P0456 has zero impact on the engine, 4x4, towing, or payload.
Warranty
Basic 3yr/36k expired. Federal emissions 8yr/80k covers EVAP through 2028.