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P1456 - Evaporative Emissions Control System Leakage Fuel Tank

Possible causes
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP purge control solenoid
- EVAP canister
- Fuel tank pressure sensor
What does this mean? What does this mean?
Tech notes
Usually, loose or bad fuel tank filler cap will trigger this codes. Retighten fuel tank filler cap and erase code to repair the problem.
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P1456 Description

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. In addition, the onboard refueling vapor recovery system (ORVR) stores fuel vapor generated when refueling in the EVAP canister.

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.

P1456 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 Video
P1456 INFINITI Evaporative Emission Control System Leak Detected Small Leak  P1456 Image
P1456 ISUZU EVAP System Leak Detected
P1456 NISSAN Evaporative Emission Control System Leak Detected Small Leak  P1456 Image
P1456 SAAB A/C Compressor Clutch Relay High Output
P1456 VOLKSWAGEN Exhaust Gas Temperature Control Bank 1 Limit Attained
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