P0454 - OBD Trouble Code

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The only important symptom to this problem is the Check Engine Light being on, which makes it very difficult for the driver to notice the problem. When your OBD-II equipped vehicle exhibits a code P0454, it means that the powertrain control module (PCM) has detected an intermittent signal from the evaporative emissions (EVAP) system pressure sensor circuit.

EVAP pressure is monitored by the PCM using the EVAP pressure sensor. The EVAP pressure sensor can be difficult to access because it is usually located in the top of the fuel tank and integrated into the fuel pump/fuel level sending unit housing. If the PCM detects that the EVAP system pressure signal is intermittent, a code P0454 will be stored and the malfunction indicator lamp (MIL) may be illuminated.

What causes this problem with the EVAP Control System Pressure Sensor Intermittent?

• Fuel cap faulty
• Wrongly installed fuel cap
• Purge control solenoid faulty
• Charcoal canister clogged
• Charcoal canister cracked or damaged
• Vacuum hoses broken or cracked
• Fuel vapour hoses broken or cracked
• Pressure or flow sensor faulty
• Bad Powertrain Control Module (PCM)

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2. Fuel Tank Vent Valve - Most of the times the vent valve doesn?t function properly causing pressure problems. Replace old valves now!
3. Vapour Canister Valve - If the vapour canister valve is faulty, it must be replaced now. Buy new canister valve from us!
4. Fuel Tank - Fuel tank must be checked for any leaks and damaged and must be replaced, if required. Buy new fuel tank form now!
5. Fuel Tank Cap - Tank cap can be faulty and wrongly installed and might require replacement. Buy new fuel tank today!
6. Diagnostic Tools - You will require quality diagnostic tools to resolve this OBD issue. Buy factory grade tools from us!

Willing to know some common symptoms of OBD Code P0454? Your wish is our demand. Have a look at them below:

Common Symptoms

There is no noticeable performance difference in the vehicle, and many drivers would not notice that they have a problem until the Check Engine light comes on. Even then, it is difficult to tell what?s wrong with the vehicle. When the P0454 code appears, it is common for other trouble codes related to the evaporative emissions control system to show up as well.

Learn the ways with which you can correct this trouble code:

The mechanic narrows down the location of the problem, and they start to make repairs. The following are some of the repairs that can be made to help fix the P0454 code

• Fuel cap replacement
• Purge control solenoid replacement
• Charcoal canister replacement
• Fuel vapour hoses replacement
• Vacuum checks and replacement

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0454 code to be stored:

• A suitable scanner (or code reader), a digital volt/ohmmeter, and a smoke machine will be most helpful in performing a successful diagnosis of OBD code P0454.
• Begin with a visual inspection of all wiring and connectors. Repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary.
• Always retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components (Including fuses) appear to be in normal working order, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data. Continue by clearing the code and operating the vehicle to see if it returns.
• This will help to determine whether or not the malfunction is intermittent. After the codes are cleared, test drive the vehicle to see if the code returns. If the code fails to immediately return, you may have an intermittent condition.
• Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can be made. Proceed with your diagnostic process by removing and reinstalling the fuel cap and test driving the vehicle (multiple drive cycles may be required to activate a service engine soon lamp) to see if it returns.
• If other evaporative emission control system codes are present, diagnose and repair them as required. Reset the codes and test-drive the vehicle. If an evaporative emissions system leak code is present (and the fuel cap is good), visually inspect vacuum and fuel vapour hoses for cracks, splits, kinks, or breakage, and repair as necessary.
• Inspect the charcoal canister and purge valve for damage or corrosion, replace faulty parts as needed. Start the engine and listen for vacuum leaks near the purge control valve or the hose from the purge valve to the intake. If no leaks are detected, a smoke machine can be very helpful for locating leaks in the extensive network of vacuum and fuel vapour lines that are required for the evaporative emissions control system.
• Place the vehicle on a lift so that you can observe it from underneath and start the engine and allow it to enter closed loop operation. Listen carefully to the purge control solenoid. Once the solenoid begins to make a clicking noise, the purge valve should be opened.
• Place the nozzle of the smoke machine hose into the vacuum supply hose for the purge solenoid and allow the system to fill with smoke. Visually inspect all lines, hoses, and system components for escaping smoke.
• Pay particular attention to the area around the fuel cap, as faulty gas caps are common.
• Remember that the charcoal canister usually has a vent which will allow smoke to escape slowly. Evaporative emission control system codes that pertain to flow can be best diagnosed beginning with the charcoal canister.
• A charcoal canister that has become contaminated with liquid can get clogged and restrict purge flow. Check for suction at both sides of the charcoal canister when the purge control solenoid is opened.
• If there is suction to the canister, it is probably faulty. Remove the canister and shake it, listening for broken or loose particles. Replace the canister as necessary. If the canister proves to be functional, check fuel vapour hoses for kinks from crushing. If the canister and lines appear normal, test the purge control solenoid for proper operation.
• It should act like ?on/off? valve that is activated by completing a circuit that is normally rated for battery voltage. Check manufacturer?s specs before applying voltage to the solenoid.
• If the solenoid is faulty, an evaporative emissions control circuit code should also be exhibited. If an evaporative emission control system circuit code is present, inspect electrical connectors and wiring for signs of corrosion or damage and repair as required.
• If wiring and connectors appear to be operational, unplug the connector from the PCM and perform a resistance check on the purge control solenoid, the system pressure and flow sensors, and system wiring.
• Compare your findings to manufacturer?s specifications and repair as necessary. Reset the codes and retest the vehicle. Keep in mind, that following repairs, multiple drive cycles may be necessary to verify that the fault condition has been rectified.

Common Mistakes When Diagnosing the P0454 Code

A common problem when diagnosing and repairing the P0454 code is replacement of the evaporative emission control system when there are other issues at play. Often, dealing with a vacuum leak, or making sure that the fuel cap is on properly is all the mechanic needs to do.