What Does P1455 Mean?
A substantial leak or complete blockage has been detected in the evaporative emission control system. This is a more severe condition than minor leak codes and indicates significant fuel vapor leakage or system obstruction.
Common Causes
30%
Loose, damaged, or missing fuel cap
25%
Cracked or disconnected EVAP lines or hoses
20%
Faulty purge valve or vent valve stuck open
15%
Damaged charcoal canister with external cracks
10%
Leaking fuel tank or filler neck seal
Diagnostic Steps
1
Step 1: Inspect and test fuel cap for proper sealing and replace if damaged
2
Step 2: Perform visual inspection of all EVAP lines and hoses for cracks, disconnections, or damage
3
Step 3: Pressurize EVAP system with smoke machine to locate large leaks
4
Step 4: Test purge and vent valve operation using scan tool active tests
5
Step 5: Inspect charcoal canister and fuel tank for physical damage or leaks
Estimated Repair Cost
$80 - $1,200
Parts + labor, varies by vehicle and location
A substantial leak or complete blockage has been detected in the evaporative emission control system. This is a more severe condition than minor leak codes and indicates significant fuel vapor leakage or system obstruction.
The most common cause of P1455 (Substantial Leak or Blockage in Evaporative Emission Control System) is: Loose, damaged, or missing fuel cap
Typical repair costs for P1455 range from $80 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but fuel odor may be present. Will fail emissions testing and wastes fuel through evaporation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1455 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emission Control System
Difficulty
Type
Manufacturer
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