P1423 Fuel Tank Gross Leak
What does P1423 mean on a Toyota?
P1423. Fuel Tank Gross Leak. This Toyota-enhanced code applies to Camry, Corolla, RAV4.
Common causes of P1423
- Disconnected filler or vent hose
- Damaged fuel pump seal
- Punctured tank from road debris
- Loose cap combined with another leak
- Stuck vent valve
How to fix P1423
- Visually inspect the tank and hoses first
- Check for fuel odor and wet spots
- Smoke test for the gross leak
- Verify vent valve operation
- Repair the breach found
Sources and review
- Last updated 2026-09-06.