P1456 Evap Control System Leakage [fuel Tank System]

Code

P1456

Applies To

Honda

Loose Cap Can Set It

Yes

Typical Fix

$138 to $150 at RepairPal

What The Carmakers Call It

• EVAP control system leakage [Fuel tank system], as printed by American Honda Motor Co.

Causes Named In Carmaker Bulletins

• A loose fuel cap. The bulletin says tighten it at least three clicks. (source)
• Damage to the fuel fill neck, its sealing surface or threads (source)

No source ranks these by how often they happen, so they are listed as the bulletins give them.

Honda's troubleshooting checks the cap first and says to tighten it at least three clicks.

The bulletin covers 1996 to 2000 Civic, 1998 to 2002 Accord, 1998 to 2001 CR V, 2000 to 2005 Insight, 1999 to 2004 Odyssey, 2003 to 2004 Pilot and 2000 to 2006 S2000.

What The Fix Costs

The usual part for this code is the gas cap. Published estimates put it at $138 to $150 at RepairPal. The full table with every source and date is on the cost page. A diagnosis first keeps you from paying for a part you did not need, which is why we price what a check engine diagnostic costs before the fix.

Getting The Light To Go Off

After the repair the light goes off once the EVAP test runs and passes on three drive cycles in a row, and the code is erased after 40 warm up cycles, per CARB. The test only runs under set conditions such as a fuel level between about 15 and 85 percent, so it can take days.

Related Codes

By Anthony Limpert, co-founder of Supercanic in San Jacinto, California, a shop with ASE certified mechanics. Updated November 12, 2026.

Author Source EEAT Authors · Anthony's Author Page

Sources For This Page

1. Service Bulletin 99-075, Troubleshooting DTC P1456 and P1457 (August 9, 2013), American Honda Motor Co., read 2026-11-12
2. 13 CCR 1968.2, Malfunction and Diagnostic System Requirements, OBD II, California Air Resources Board (via Cornell LII), read 2026-11-12
3. Gas Cap Replacement Cost Estimate, RepairPal, read 2026-11-12