P051F OBD Error Code: Problem & Solutions

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The P051F can be identified as Positive Crankcase Ventilation Filter Restriction. There are a number of sensors and out of all of them, the engine control module monitors as well as adjusts in order to keep the car engine running properly. It is the crankcase pressure sensor which is responsible for providing the crankcase pressure values to the ECM so that it can maintain a healthy atmosphere.

It is always good to learn more, so here is some more information about P051F fault code. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present.

The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the Positive Crankcase Ventilation Filter Restriction?

• The PCV filter might be clogged
• Defaults in the PCV valve
• PCM might start malfunctioning or PCM programming error
• Flaws in the crankcase pressure sensor
• There can be open or shorted crankcase pressure sensor wiring

1. Camshaft Position Sensor - The P051F code can also arise due to some issues in Camshaft Position Sensor. So, it is advised to replace them as soon as possible.
2. Engine Wiring Connectors - Do you remember when was the last time you got your car Engine Wiring Connectors checked up? A damaged Engine Wiring Connectors can cause a lot of issues like displaying P051F code.
3. PCV System - PCV System should never be neglected. May be there is some fault in it due to which P051F code may start flashing.
4. Powertrain Control Module - Is your Powertrain Control Module damaged or broken? Don’t worry as we have solutions for all your problems.
5. Crankshaft Position Sensor - Defective car Crankshaft Position Sensor can be a major reason why P051F code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
6. Engine Control Module - Everything is okay with the Crankshaft Position Sensor and still OBD code P051F triggering? Then there must be some defects in Engine Control Module. Replace them as soon as possible.
7. Fuel Pressure Regulator - Fuel Pressure Regulator is an important auto part. Take care of it and you can rely on us to purchase best quality Fuel Pressure Regulator online.

Willing to know some common symptoms of OBD Trouble Code P051F? Your wish is our demand. Have a look at them below:

Common Symptoms

• There can be hissing noise from engine area
• Smoke might start coming from the under-hood area
• Some drivability issues might be created due to a vacuum leak
• There can be a leakage in the engine oil

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P051F:

• Repair or replace the clogged PCV filter
• If the PCV valve is faulty, then you must repair it
• Restore the malfunctioning PCM
• Make sure that you replace the crankcase pressure sensor

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If you want to diagnose the P051F trouble code, then you will need a manual vacuum pressure gauge, a diagnostic scanner, a digital volt/ohmmeter as well as a reliable source of vehicle information. A manual vacuum pressure test should be performed prior to diagnosing any excessive crankcase pressure/PCV related codes. If the engine fails to produce enough vacuum, it must be repaired before moving forward with your diagnosis. To conduct a manual vacuum pressure test, disconnect the PCV vacuum hose and attach your vacuum pressure gauge there. Your vehicle information resource should yield specifications regarding minimum engine vacuum

Then you should inspect all PCV hoses for signs of cracking or breakage and make repairs as necessary. Cracked or collapsed PCV vacuum hoses may contribute to the conditions which caused the P051F to be stored. If there is sufficient vacuum on the inlet side of the PCV filter but not on the outlet side, then there are chances that the filter might be clogged

If the engine is working properly and there are no vacuum leaks, continue with a visual inspection of all crankcase pressure sensor wiring and connectors. You can always make repairs as per the requirement

Then connect the scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data. Writing this information down may aid you as your diagnosis unfolds. After that, clear the codes and test-drive the vehicle to see if the code is reset

Utilize your vehicle information resource to obtain connector face views, wiring diagrams, connector pinout charts, component testing procedures and specifications. All this information will be required to proceed with your diagnosis

Carefully test the crankshaft pressure sensor using the DVOM

• With the key on and engine off (KOEO), place the DVOM on the ohms setting and follow manufacturer’s procedures/specifications for testing the crankcase pressure sensor with the connector unplugged
• If the sensor does not comply with manufacturer’s specifications, it should be considered faulty
• If the sensor does comply with manufacturer’s specifications, then you must move on to the next step

Use the DVOM to test for reference voltage (typically 5-volts) and a ground at the crankcase pressure sensor connector

• With the KOEO and the crankcase pressure sensor unplugged, probe the reference voltage pin of the sensor connector with the positive test lead of the DVOM
• Connect the negative test lead to the ground pin of the connector to test the entire circuit
• If there is no reference voltage detected at the sensor connector, locate the PCM and test the corresponding circuit at the PCM connector. Use the positive test lead of the DVOM
• The negative test lead should be connected to a known good ground for this test
• If there is no reference voltage at the PCM connector, suspect PCM failure or a programming error
• If there is no ground at the sensor connector, use your source of vehicle information to locate the ground source and make sure that it is securely fastened to the engine block or battery
• If there is reference voltage and ground at the crankcase pressure sensor connector, proceed to the next step

Test crankcase pressure sensor signal circuit voltage using the DVOM

• With the key on engine running (KOER) and the crankcase pressure sensor reconnected, use the positive lead of the DVOM to probe sensor signal voltage right behind the connector
• The negative test lead should again be connected to a battery ground
• Use the vacuum pressure gauge to obtain correct crankcase pressure and compare sensor signal voltage to the pressure-to-voltage chart in your vehicle info resource
• If crankcase pressure sensor signal voltage is incorrect, consider the sensor faulty
• If crankcase pressure sensor signal voltage (at the sensor connector) reflects the correct degree of voltage, proceed to the next step

Test the crankcase pressure sensor signal circuit at the PCM connector

• With the KOER, use the DVOM positive test lead to probe the crankcase pressure sensor signal circuit at the PCM connector
• The negative test lead should be connected to a battery ground
• If a correct crankcase pressure sensor signal is discovered at the sensor connector but not at the corresponding circuit of the PCM connector, suspect that there is an open circuit between the two

If the crankcase pressure sensor and all circuits are within specifications, suspect PCM failure or a PCM programming error.

Technical service bulletins which parallel the vehicle (as well as the symptoms and codes stored) may help with your diagnosis