P252E - OBD Trouble Code

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This is an OBD-II error code see by the Powertrain Control Module (PCM) when it has picked up a malfunction of the engine oil quality sensor of your vehicle. Hence, the P252E code is defined as an Engine Oil Quality Circuit Intermittent/Erratic. The sensor has the responsibility of monitoring the level, quality and temperature of the engine oil and reporting the information to the PCM. After the code is set you will find a check oil or check engine light turning on in your instrument cluster. This is basically to inform you where the issue may be. Depending on the vehicle you drive, you may also get additional information regarding the engine oil.

In order to be able to diagnose the code you will have to understand what happened and what the P252E code truly means. The oil quality sensor circuit is the one that sends the signals to the Engine Control Module or ECM. Any issues with the circuit or connectors can cause random signals to float through to the ECM causing the P252E code to be set. Being one of the main components within the circuit, the engine oil quality sensor can be found mounted to the engine oil pan in most vehicle makes and models. But to be sure of its exact location you will have to refer your specific vehicles technical service bulletins (TSB). Read more in this article about the causes to this error and how to diagnose, and what to repair/replace to let go of the P252E error code.

What causes this problem with the Engine Oil Quality Circuit Intermittent/Erratic?

• Issue with the engine oil quality sensor
• The engine oil is below the normal/optimum level needed
• The quality of the engine oil is not acceptable
• Faulty or damaged electrical system including the connectors, wiring and circuitry
• Malfunctioning of the ECM (rare but possible)

1. Engine Oil Quality Sensor - Is the sensor whose main job is to check the engine oil and how it is doing. Failure of the sensor causes the P252E code to set by the PCM. Fix the issues via repairs or replacement as needed.
2. Engine Control Module - The ECM is the main system of your vehicle that monitors all the other sensors and modules. The OBD-II codes are set when it notices an issue. In a situation where the ECM itself isn’t functioning correctly, wrong error codes can get set, such as the P252E code. It’s important to repair it immediately or find replacement at PartsAvatar.
3. Oil Pressure Gauge - This gauge is present on your vehicle's instrument cluster and is responsible for showing the pressure of the oil to the driver. Wrong reading of the gauge can cause issues with your vehicle, try to repair it and see how that helps, otherwise replace it. Order online on PartsAvatar and have your order reach you in less than a weeks’ time.
4. Powertrain Control Module - Is the central system of your vehicle. The P252E code may have set because of a PCM malfunction, find the perfect replacement PCM on PartsAvatar. Remember that replacements require reprogramming by a professional. Browse from a wide range of PCM online at PartsAvatar, we ship orders above $99 free!
5. Engine Wiring Connector - All signals from the engine oil quality sensor are sent via electrical system, the connector is part of the engine wiring harness. If the connector is burned, chafed, has bent pins it can put across incorrect signals to be processed to the ECM. Hence it is important to repair or replace it, you can order vehicle compatible auto parts like connectors on PartsAvatar. We offer 24/7 online customer support for free.
6. Diagnostic Tools - These are all the tools one may require in diagnosing automobile OBD codes. Competent diagnostic tools can help resolve codes like P252E quickly. Choose from a wide range of diagnostic tools on PartsAvatar, track your order till it reached your doorstep!

We at Parts Avatar Canada care for our customers, and that’s why we will help you to diagnose P252E code by listing out some major symptoms. They are mentioned below as follows:

Common Symptoms

• Issues with cranking the engine
• Gauge reads low oil pressure
• Check engine/ service engine lamp is illuminated
• Check Oil warning is also present on instrument cluster

Learn the ways with which you can correct this trouble code P252E:

• Repair or replace the engine oil quality sensor
• Repair the connectors by cleaning any corrosion on them. Replace them if that doesn't help
• All faulty wiring will have to be repaired, or replaced
• Change the oil and the filter if repairs don’t solve the filters problems
• All the malfunctioning ground straps will need to be replaced
• Flash or replace the ECM

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of Engine Oil Quality Sensor, Ecm, Oil Pressure Gauge, Oil Quality Sensor, Pcm, Connector, Oil Temperature, Oil Level and a lot more. We are sure that now all your issues would be resolved.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P252E code to be stored:

Step 1 - Get your vehicle specific Technical Service Bulletins (TSB) and see if you can find the code and ways to resolve it there. The TSB will be source of reference through the diagnostic procedure. Make sure you match the TSB’s accurately with your vehicles, year, make, model and engine details.

Step 2 - Check the condition of the engine oil and see if it is at the appropriate level or not. You will have to refill it if it’s running low.

Step 3 - You can easily find the components related to the engine oil quality sensor circuit and inspect if there’s any damages visible. To locate these components, take help from the TSB. Visually inspect the wiring for any damages lie bare wires, burned or chafed surfaces, rubbing, scraping etc. Repair as needed or opt for replacement.

Step 4 - It’s time to check the connectors and see if they’re securely set, or if there’s any corrosion or damage to the pins. Sometimes pins get bent as well. Perform this step with the connectors and wires of the ECM as well. In order to verify that everything is configured correctly, refer the TSB. Verify the configurations of the fuse and fusible links as well.

Step 5 - Using correct instruments you can do a voltage check. You will need a DVOM and your TSB again. Ensure the reference voltage is well within the range specified by your vehicle's manufacturer. If you find that there is an absence of power source or ground, then you will need to perform continuity tests to verify the strength of the wiring, connectors and other components. These continuity tests have to be performed after removing power from the circuit and the readings for wiring and connections should show 0 ohms of resistance. Resistance of no continuity is indicative of improper wiring, or shorted or corroded wires. These must be repaired and replaced as needed.

Common Mistakes When Diagnosing the P252E Code

• Failure of the whole Oil quality sensor
• Failure of the Powertrain Control Module (PCM)
• Several issues present with the wiring, connectors or circuitry