p0456
Easy Fix
RAM · Trucks
EVAP Very Small Leak
Quick Answer
Error code P0456 on your RAM Trucks means: EVAP Very Small Leak. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Replace fuel filler cap with new OEM cap
2
Perform smoke test on EVAP system to locate leak source
3
Inspect all EVAP hose connections for tightness
4
Clean or replace fuel vapor vent valve
5
Clear code and drive vehicle to confirm repair
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Fuel tank cap
EVAP hose
Vapor vent valve
Canister seal kit
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