P0456 Saturn Code - EVAP Control System Leak Detected Very Small Leak
Quick Answer
The Powertrain Control Module (PCM) tests the Evaporative Emission (EVAP) system for the following conditions: - Large and small leaks - Excess vacuum - Purge flow during non-commanded conditions - Fuel Level and Fuel Pressure sensor faults - EVAP Purge and Vent Valve faults The PCM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0456 Saturn indicates EVAP Control System Leak Detected Very Small Leak.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0456 Saturn Description
- Large and small leaks
- Excess vacuum
- Purge flow during non-commanded conditions
- Fuel Level and Fuel Pressure sensor faults
- EVAP Purge and Vent Valve faults
The PCM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The PCM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The PCM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.
What are the Possible Causes of the DTC P0456 Saturn?
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
How to Fix the DTC P0456 Saturn?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0456 Saturn 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.
Need more information about the P0456 Saturn code?
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Frequently Asked Questions about P0456 Saturn Code
1. What are common symptoms of OBDII code P0456 in a Saturn vehicle?
- Common symptoms include the illumination of the check engine light, a mild gasoline smell near the vehicle, and no noticeable impact on the vehicle's performance.
2. What are the possible causes of OBDII code P0456 in a Saturn vehicle?
- The code P0456 typically indicates a very small leak in the evaporative emission control system, which can be caused by a loose or damaged gas cap, a cracked or damaged fuel filler neck, a faulty purge control valve, or a leak in the EVAP system hoses.
3. How serious is an OBDII code P0456 in a Saturn vehicle?
- While this code is not considered a serious issue in terms of immediate safety or drivability, it should not be ignored as it can lead to increased emissions and potentially affect the vehicle's overall performance over time.
4. Can I continue driving my Saturn with an OBDII code P0456?
- In most cases, it is safe to drive the vehicle with a P0456 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent any potential long-term problems.
5. How can I diagnose an OBDII code P0456 in my Saturn?
- A diagnostic scan tool can be used to retrieve the specific trouble code, followed by a visual inspection of the EVAP system components, checking for loose connections, damaged hoses, or a faulty gas cap.
6. What is the typical repair process for an OBDII code P0456 in a Saturn vehicle?
- The repair process often involves tightening or replacing the gas cap, inspecting and repairing any damaged hoses or components in the EVAP system, and clearing the code from the vehicle's computer.
7. Can I reset the check engine light after fixing the issue related to OBDII code P0456 in my Saturn?
- Yes, the check engine light can be reset using a diagnostic scan tool after the issue causing the P0456 code has been resolved. This will clear the code from the vehicle's computer memory.
8. Are there any preventive measures to avoid OBDII code P0456 in a Saturn vehicle?
- Regularly inspecting the gas cap for proper sealing, avoiding overfilling the fuel tank, and ensuring all EVAP system components are in good condition can help prevent the occurrence of a P0456 code.
9. Can a DIY enthusiast fix the OBDII code P0456 issue in a Saturn vehicle?
- Depending on the cause of the code, some DIY enthusiasts may be able to fix the issue themselves by tightening the gas cap or replacing damaged hoses. However, more complex repairs may require professional assistance.
10. How long does it typically take to repair an OBDII code P0456 in a Saturn vehicle?
- The repair time can vary based on the specific cause of the code, but in most cases, it can be resolved within a few hours at a repair shop or dealership specializing in Saturn vehicles.
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