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p0455
Easy Fix
RAM · Trucks
EVAP Large Leak
Quick Answer
Error code P0455 on your RAM Trucks means: EVAP Large Leak. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
DTDSDRTXDUDVDDPMPC
Likely Causes
  1. Loose or missing gas cap
  2. Cracked evaporative emission hose
  3. Faulty charcoal canister
  4. Purge valve stuck open
  5. Leaking fuel tank
How to Fix It
1
Check and tighten gas cap; clear code and retest
2
Visually inspect all EVAP hoses for cracks or loose connections
3
Listen for hissing from fuel tank area indicating large leak
4
Test purge valve solenoid with voltage tester
5
If code persists, scan for secondary codes to pinpoint issue
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 filler cap
EVAP hose kit
Purge valve
Charcoal canister
Related Error Codes
P0171P0174P0300P0420P0430
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