P0456 on Dodge: Evaporative Emission System Very Small Leak Detected
Severity: 1 of 4
Safe to drive. It affects emissions, not engine operation. Repair it before your next inspection.
Estimate range covers the repairs listed below; see the cost breakdown. A flashing check engine light, a hot temperature gauge, or brakes that feel different mean stop driving and get help.
What P0456 usually means on a Dodge
Many Dodge vehicles use an ESIM to run the EVAP leak test. Chrysler guidance says to inspect the cap and hoses, smoke test the system, and confirm the PCM software is current before replacing the ESIM or canister.
Most likely causes on Dodge vehicles
- Gas cap
- EVAP hose or canister leak found by smoke test
- ESIM (after leaks are ruled out)
Order reflects cost and likelihood in general; your vehicle may differ. Confirm with testing before buying parts.
Dodge specific tips
- Do not replace the ESIM until a smoke test rules out leaks.
Estimated repair cost
This is an estimate, built from typical parts price ranges plus labor hours times an assumed shop rate of $110 to $190 per hour. Actual prices vary by vehicle, region, and shop. Diagnosis fees are often extra.
| Repair | Parts | Labor | Estimate (low / high) |
|---|---|---|---|
| Gas cap | $10 to $35 | 0.0 to 0.1 h | $10 + 0.0 × $110 = $10 $35 + 0.1 × $190 = $54 |
| Smoke test diagnosis | $0 to $0 | 0.5 to 1.0 h | $0 + 0.5 × $110 = $55 $0 + 1.0 × $190 = $190 |
| EVAP valve or hose | $15 to $150 | 0.3 to 1.5 h | $15 + 0.3 × $110 = $48 $150 + 1.5 × $190 = $435 |
Costs are generic for this code; parts and labor on some Dodge models may run higher.
Watch a repair video
How to Find an EVAP Leak (P0440, P0442, P0455, P0456). Third-party video, loads from YouTube (privacy-enhanced mode) only when you press play. Procedures vary by vehicle. Search YouTube for “P0456 Dodge fix” videos.
Repair manuals
Step-by-step service manuals for Dodge with torque specs and wiring diagrams:
Haynes manuals for Dodge Chilton manuals
Affiliate disclosure: links in this box may earn FixOrPark a commission at no extra cost to you.
Check Dodge recalls
Enter your VIN at the NHTSA recall lookup before paying for repairs.
FAQ
Is the ESIM a common failure?
It does fail, but Chrysler guidance says leaks and software should be ruled out first.
Read the full P0456 guide or more Dodge check engine notes.