P0455 Chevrolet Malibu
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 Chevrolet Malibu 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 Chevrolet Malibu.
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 Chevrolet Malibu.
Common Causes on Chevrolet Malibu
- Gas cap missing or not sealing at all
- EVAP purge solenoid stuck wide open
- EVAP vent valve stuck open
- Large EVAP vapor line disconnect or crack
- Fuel tank seal gasket failure
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 Chevrolet Malibu
Malibu P0455 is most commonly caused by a missing gas cap or stuck-open EVAP solenoid. These are inexpensive and quick fixes.