Error Code P252B: What It Means & What To Do?

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This is an OBD-II error code which is will be displayed when there’s an issue with the Engine oil quality sensor. The P252B code is defined as an Engine Oil Quality Sensor Circuit Range/Performance. When the Powertrain Control Module (PCM) notices an error, it will set the P252B code.

The oil quality sensor circuit has the job of sending a signal to the ECM of your car, informing about the overall status of the oil. So basically, this circuit will monitor the quality, temperature as well as the engine oil level. The engine oil quality sensor is mounted on the engine oil pan; however, the exact location differs from vehicle to vehicle. When there’s an issue the driver will come to know via signals on the dashboard, few vehicles may have gauges or readouts that inform about oil temperature, oil level and oil pressure.

What causes this problem with the Engine Oil Quality Sensor Circuit Range/Performance?

• The engine oil quality sensor is not working properly
• Level of the engine oil is low
• Unsatisfactory quality of oil
• Faulty or damaged wiring
• Connectors are corroded, damaged or loose
• Faulty ECM

1. Engine Oil Quality Sensor - Is responsible for monitoring the quality of the engine oil. Poor quality oil can cause the P252B code to set. You can fix this issue by repairs if possible, otherwise opt for replacement of sensor.
2. Engine Control Module - The ECM will monitor the functioning of all the modules in the vehicle, and if it notices an issue with the engine oil quality sensor, it will set the P252B code. A faulty ECM is not good for the overall health of your vehicle, try to repair or opt for replacement. Find ECM on PartsAvatar, order from the comfort of your home. And don’t worry we ship to the remotest corners of Canada.
3. Oil Pressure Gauge - Displays the pressure of the oil to the driver so that proper information regarding the oil pressure is available. Any problems will have to be corrected so that the P252B error can go away. You can try to repair the issue, if that doesn’t help, simply go for replacement. Order easily on PartsAvatar and have your order reach you in just a matter of days.
4. Powertrain Control Module - Is the central processing unit of your vehicle, and is also known as the ECM. Codes like P252B can be set if there’s a problem with the PCM as well, but that’s a very case. You resolve PCM issues via repairs or replacement. Replacements will require some level of reprogramming by a professional. So, bear that in mind and find one that is experienced. Search from a wide range of PCM online at PartsAvatar, we ship orders above $99 free!
5. Engine Wiring Connector - Is part of the engine wiring harness. These wires and connectors hold great significance in transferring electrical data in the vehicle system. A damaged connector can cause multiple issues, so repair it or replace it as needed. Find the perfect one compatible with your vehicle on PartsAvatar today.
6. Diagnostic Tools - These are essential tools to help in diagnosing various issues in your vehicle. Proper diagnostic tools can help resolve codes like P252B easily. Find the tools you need online, PartsAvatar will ship them right to your doorstep.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P252B here:

Common Symptoms

• You may find difficulty in cranking the engine
• The gauge on your dashboard reads low oil pressure
• The Service engine soon light is lit
• A message asking you to ‘Check Oil’ is visible on the instrument cluster

Want to correct the Trouble Code P252B? Read these points mentioned below:

• Repair or try to replace the entire engine oil quality sensor
• Observe the state of the connectors and clean any corrosion present
• All the faulty wiring will either have to be repaired or replaced
• You may have to change the oil and its filter is it’s not in a good condition
• All faulty ground straps will need repairs or replacements
• Repair, flash or replace the faulty ECM

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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 P252B code to be stored:

Get your vehicle's specific Technical Service Bulletins 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. Now 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.

Locate all important components using the TSB. Find the components related to the engine oil quality sensor circuit and inspect if there’s any damages visible. Visually inspect the wiring for any damages lie bare wires, burned or chafed surfaces, rubbing, scraping etc. Repair as needed or opt for replacement. Move on to 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.

The correct instruments will help you do voltage checks. 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 P252B Code

• Failed Oil quality sensor
• Malfunction of the Powertrain Control Module (PCM)
• Problems present in the issue