EVAP System Gross Leak Detected
The P1462 code indicates that the Powertrain Control Module (PCM) has detected a large leak or no flow in the evaporative emission control (EVAP) system during a self-test. This means the system cannot hold vacuum or generate the expected pressure differential, suggesting a large-diameter opening (greater than 1.0 mm) or a complete blockage in the purge or vent line.
01. Most Common Causes
- Fuel cap loose, damaged, incorrect, or missing
- Cracked, disconnected, or perforated EVAP hoses or tubes
- Canister purge valve stuck open or closed
- Canister vent valve stuck open
- Charcoal canister saturated with fuel or structurally damaged
- Faulty fuel tank pressure sensor or wiring short/open
- Leak at the fuel filler neck or tank seals
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Fuel odor near the vehicle
03. Step-by-Step Diagnosis
Inspect and tighten the fuel cap; clear codes and retest.
Perform a smoke test to locate the leak.
Check EVAP hoses and connections for damage.
Test the purge and vent valves for proper operation.
Inspect the charcoal canister for damage or saturation.
Test the fuel tank pressure sensor and its wiring.
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive with this code, but it may cause increased emissions and a fuel smell. Have it repaired soon to avoid failing an emissions test.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on the cause. A simple fuel cap replacement is cheap, while replacing a purge valve or canister can be more expensive.