P1456 Code - Evaporative Emissions Control System Leakage Fuel Tank
Quick Answer
The evaporative emission (EVAP) control system stores fuel vapor from the fuel tank in the EVAP canister temporarily to prevent it from escaping to the atmosphere and to enable it to be drawn into the engine by intake manifold vacuum and burned. Common causes include Missing Fuel Filler Cap, Incorrect Fuel Filler Cap used, Fuel Filler Cap remains open or fails to close. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1456 indicates Evaporative Emissions Control System Leakage Fuel Tank.
- Common causes
- Common causes include Missing Fuel Filler Cap, Incorrect Fuel Filler Cap used, Fuel Filler Cap remains open or fails to close.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1456 Description
The EVAP control system leak detection method improves the accuracy and frequency of the detection by determining faulty components and vapor leakage for each part. The EVAP control system (from the purge valve to the fuel tank) is divided into two parts. One is the "EVAP Canister Side" (from the EVAP two-way valve to the purge valve) and the other is the "Tank Side" (from the EVAP two-way valve to the fuel tank). There is 0.04-inch leak detection and 0.02-inch leak detection. If the 0.04 inch leak detection results are OK, the 0.02-inch leak detection runs. The P1456 code is detected when the EVAP system has a very small leak.
What are the Possible Causes of the DTC P1456?
- Missing Fuel Filler Cap
- Incorrect Fuel Filler Cap used
- Fuel Filler Cap remains open or fails to close
- Foreign matter caught in the Fuel Filler Cap
- Faulty EVAP Two-Way Valve
- Faulty EVAP Bypass Solenoid Valve
- Faulty EVAP Canister
How to Fix the DTC P1456?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1456 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P1456 Acura — Evaporative Emissions Control System Leakage Fuel Tank
- P1456 Audi — Exhaust Gas Temperature Control Bank 1 Limit Attained
- P1456 Honda — Evaporative Emissions Control System Leakage Fuel Tank
- P1456 Infiniti — Evaporative Emission Control System Leak Detected Small Leak
- P1456 Isuzu — EVAP System Leak Detected
- P1456 Nissan — Evaporative Emission Control System Leak Detected Small Leak
- P1456 Saab — A/C Compressor Clutch Relay High Output
- P1456 Volkswagen — Exhaust Gas Temperature Control Bank 1 Limit Attained
Frequently Asked Questions about P1456 Code
No Frequently Asked Questions about P1456 Code found.
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