P0456 – Evaporative Emission Control System Leak Detected (very small leak)
Encountering the P0456 code in your Chery? Here is a complete guide to its causes, symptoms, and solutions.
What Does Code P0456 Mean
The P0456 code indicates that the engine control module (ECM) has detected a very small leak in the evaporative emission control system. This system is designed to capture and recycle fuel vapors from the fuel tank, rather than releasing them into the atmosphere. The leak can be caused by a variety of factors, including a faulty or loose gas cap, a cracked or damaged fuel tank, or a clogged or faulty vapor canister.
Common Chery Models Affected
- Chery Tiggo
- Chery Arrizo 7
- Chery Arrizo 5
- Chery Fulwin 2
- Chery Cowin 3
Symptoms
- Check Engine Light (CEL) illumination
- Fuel odor from the fuel tank or fuel system
- Decreased fuel efficiency
- Engine performance issues, such as rough idling or stalling
- Fuel leaks or spills from the fuel tank or fuel system
- Difficulty starting the engine
- Reduced engine power or performance
Causes Table
| Potential Cause | Probability (High/Medium/Low) |
|---|---|
| Faulty or loose gas cap | High |
| Cracked or damaged fuel tank | Medium |
| Clogged or faulty vapor canister | Medium |
| Leak in the fuel tank or fuel system | High |
| Faulty or clogged fuel tank vent valve | Low |
| Faulty engine control module (ECM) | Low |
Diagnostic Steps
To diagnose the P0456 code, start by checking the gas cap and fuel tank for any signs of damage or leaks. Next, use a scan tool to monitor the fuel tank pressure and vapor canister purge valve readings. The readings should change smoothly depending on engine RPM and load. If the readings are erratic or inconsistent, it may indicate a problem with the vapor canister or purge valve. Finally, perform a smoke test to detect any leaks in the fuel tank or fuel system.
How to Fix
To fix the P0456 code, start by replacing the gas cap or repairing any leaks in the fuel tank or fuel system. If the problem is with the vapor canister or purge valve, replace these components as needed. In some cases, the engine control module (ECM) may need to be reprogrammed or replaced.
Is it Safe to Drive with this Code
Driving with the P0456 code can cause decreased fuel efficiency, engine performance issues, and potentially lead to more serious problems, such as engine damage or failure. It is recommended to address the issue as soon as possible to avoid any further damage or risks.
Estimated Repair Cost
The estimated repair cost for the P0456 code can range from $50 to $500, depending on the cause and extent of the problem. If the issue is with the gas cap or fuel tank, the repair cost will be relatively low. However, if the problem is with the vapor canister or engine control module (ECM), the repair cost can be significantly higher.
Preventive Maintenance Tips
To prevent the P0456 code, make sure to regularly check and maintain the fuel tank and fuel system. This includes checking the gas cap for any signs of damage or wear, and ensuring that the fuel tank is properly vented and maintained. Additionally, avoid overfilling the fuel tank, as this can cause the fuel to spill or leak from the tank.
Related Trouble Codes
- Error P0442 on Chery — evaporative emission control system leak detected (small leak)
- Error P0443 on Chery — evaporative emission control system leak detected (large leak)
- Error P0455 on Chery — evaporative emission control system leak detected (gross leak)
- Error P0457 on Chery — fuel cap loose or missing