What does fault code P1456 mean?

EVAP Control System Leakage (Fuel Tank System). Acura shares Honda's EVAP system design and PCM logic on most models.

P1456

EVAP Control System Leakage (Fuel Tank System)

Q: What are the possible causes of P1456?

Loose or faulty fuel cap; Cracked EVAP hose; Faulty fuel tank pressure sensor; Failed canister

Q: How to fix P1456?

Start with the fuel cap — tighten/replace; Smoke-test the EVAP system if cap doesn't resolve it; Replace faulty component found

Severity: Low Emission Control Acura Specific Est. Repair: $20 - $300

Usually safe to drive short-term, but diagnose soon.

Quick Answer

P1456 means “EVAP Control System Leakage (Fuel Tank System).” Severity: Low. Estimated repair cost: $20 - $300. Most common sign: CEL only, no drivability impact.

What Does P1456 Mean?

Acura shares Honda's EVAP system design and PCM logic on most models.

Common Symptoms

CEL only, no drivability impact

Possible Causes

Loose or faulty fuel cap

Cracked EVAP hose

Faulty fuel tank pressure sensor

Failed canister

How to Fix P1456 – Repair Guide

Start with the fuel cap — tighten/replace

Smoke-test the EVAP system if cap doesn't resolve it

Replace faulty component found

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Budgeting for This Repair?

A typical P1456 repair runs about $20 - $300. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.