P0455 RAM 1500
EVAP System Leak Detected (Gross Leak) · Powertrain Code · Medium · Repair: Easy
What is P0455?
A large leak has been detected in the EVAP system. Check gas cap first — if secure, look for disconnected or cracked EVAP hoses, a stuck-open purge valve, or a leaking charcoal canister.
When the RAM 1500 triggers code P0455 (evap system leak detected (gross leak)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the RAM 1500.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your RAM 1500.
Common Causes on RAM 1500
- Gas cap missing or completely worn
- EVAP vent solenoid stuck wide open at charcoal canister
- Large EVAP vapor line disconnected or crushed under vehicle
- Fuel tank seal failure at sending unit
- Charcoal canister housing cracked from road debris
Symptoms
- Check engine light illuminated
- Noticeable fuel smell near vehicle
- Gas cap warning light on dashboard
- Failed emissions test
- Fuel economy noticeably decreased
Notes for RAM 1500
Ram 1500 EVAP vent solenoid stuck open is the most common P0455 cause after the gas cap. Easy to access near the charcoal canister.