p0455
Easy Fix
Buick · SUVs
Evaporative Emission Control System Leak Detected (Large Leak)
Quick Answer
Error code P0455 on your Buick SUVs means: Evaporative Emission Control System Leak Detected (Large Leak). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Verify code presence
2
Check fuel cap seal and replace if needed
3
Inspect all fuel vapor hoses for cracks
4
Check fuel tank for leaks
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 cap
Fuel vapor hoses
Gasket sealant
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