Error Code P051A: What It Means & What To Do?

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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.

The trouble code P051A can be defined as Crankcase Pressure Sensor Circuit.

There are a lot of fumes in the engine internally when it is running. That is the reason why it is essential for the engine control module to have a perfect crankcase pressure value. This is needed not only ensure the pressure does not get too high and possibly cause damage to seals and gaskets, but also it requires this value in order to recycle these burnable fumes back into the engine via the positive crankcase ventilation system.

What causes this problem with the Crankcase Pressure Sensor Circuit?

• Faults in the positive crankcase ventilation valve
• Issues related to PCV like broken runners/tubes, disconnected, chafed lines, etc
• PCV system might be clogged
• Defects in the crankcase pressure sensor
• There might be some internal electrical issue within the sensor
• Malfunctioning in the engine control module
• Engine overfilled with oil
• Defaults in the crankcase pressure sensor
• There can be moisture present in the oil
• Water intrusion
• There can be open or shorted crankcase pressure sensor
• Crankcase Pressure Sensor circuit poor electrical connection

1. Engine Control Module - Did your mechanic just found out that there is some fault in the Engine Control Module? Buy top notch Engine Control Module from us at economical prices.
2. Engine Wiring Connectors - A damaged Engine Wiring Connectors can cause a lot of issues. It would be nice if you get it replaced on time.
3. Powertrain Control Module - Everything is fine with the Engine Wiring Connectors and still OBD code P051A flashing? Then there is definitely some fault with the Powertrain Control Module. Get it checked and replace if needed.
4. Crankshaft Position Sensor - Crankshaft Position Sensor is an important car part which should never be neglected. May be there is some fault in it due to which P051A code may start flashing.
5. Camshaft Position Sensor - A faulty Camshaft Position Sensor can be troublesome. You can always rely on us as we have best auto parts for our customers.
6. Fuel Pressure Regulator - If everything is alright with PCM, then there is surely some defect in Fuel Pressure Regulator. Get it replaced before the situation gets worse.
7. PCV System - P051A code can display due to some issues in the PCV System. So, it is very important to replace the PCV System with us at equitable prices.

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P051A code by mentioning some major symptoms below:

Common Symptoms

• The smell of fuel might start coming
• Flashing up of the check engine light
• Reduction in the overall fuel economy
• There can be a leakage in the gaskets
• The car engine might perform abnormally
• Issue of sludge in oil
• Engine smoking black soot
• High/Low internal crankcase pressures

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 P051A:

• Restore the positive crankcase ventilation valve
• Make sure that the clogged PCV system is repaired properly
• Carefully correct the problem of water intrusion
• You can always replace the crankcase pressure sensor if it is opened or shorted
• If there are some faults in the crankcase pressure sensor, then you must replace it
• Correct the issue of internal electrical issue within the sensor
• Replace the engine control module if it is not functioning properly
• Inspect the crankcase pressure sensor

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Here are some steps which you should follow in order to diagnose this fault code:

The first thing which you should do is to research the Technical Service Bulletins (TSB) for known issues with the specific vehicle in the troubleshooting process. Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your vehicle

Step 1

You should open the oil cap on the top of the engine to inspect for any obvious signs of sludge build-up. Sludge can be caused by something as simple as a lack of oil changes, or following longer than recommended intervals. A positive crankcase ventilation issue can cause moisture to enter the system causing sludge too. Either way, ensure your oil is clean and full

You must keep this thing in mind to avoid overfilling the engine with oil. Do not start engine if this has happened, drain oil to bring level to an acceptable range

Step 2

Test the sensor by following manufacturer specific desired values from your service manual. This usually entails using your multimeter and testing different values between pins. Record and compare findings to your make and model specifications. If anything is outside of specs, then you must replace the crankcase pressure sensor

Step 3

The crankcase pressure sensors are typically mounted directly to the engine block (AKA Crankcase), the harnesses and wires involved, are routed through crevices and around extreme temperature areas (i.e. exhaust manifold). You must be aware of this when visually inspecting the sensor and circuits. The fact that these wires and harnesses are subject to the elements, inspect for any hardened/cracked wires or moisture in the harness. Keep this in mind that the connector should be connected firmly and dry of any oil residue