AutoCodes – Generic – P051F

P051F Code - Positive Crankcase Ventilation Filter Restriction

Quick Answer

The Engine Control Module (ECM) monitors the Crankcase Pressure Sensor signal. Common causes include Positive Crankcase Ventilation Filter Restriction, Faulty Crankcase Pressure Sensor, Crankcase Pressure Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P051F indicates Positive Crankcase Ventilation Filter Restriction.
Common causes: Common causes include Positive Crankcase Ventilation Filter Restriction, Faulty Crankcase Pressure Sensor, Crankcase Pressure Sensor harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,064

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 27, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P051F Description

The Engine Control Module (ECM) monitors the Crankcase Pressure Sensor signal. The ECM sets the OBDII code when the Crankcase Pressure Sensor is not to factory specifications.

OBDII Code P051F - Positive Crankcase Ventilation Filter Restriction - AutoCodes.com — P051F Code - Positive Crankcase Ventilation Filter Restriction

What does this mean?

What are the Possible Causes of the DTC P051F?

Positive Crankcase Ventilation Filter Restriction
Faulty Crankcase Pressure Sensor
Crankcase Pressure Sensor harness is open or shorted
Crankcase Pressure Sensor circuit poor electrical connection

How to Fix the DTC P051F?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P051F code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P051F code?

Need more information on how to fix the P051F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P051F code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P051F Code

1. What are the common symptoms of OBDII code P051F (Positive Crankcase Ventilation Filter Restriction)?

- Common symptoms include poor engine performance, reduced fuel efficiency, and a noticeable decrease in power.

2. What causes the OBDII code P051F to trigger?

- The code is triggered when the positive crankcase ventilation (PCV) filter becomes restricted or clogged, leading to improper ventilation of the crankcase.

3. How can a clogged Positive Crankcase Ventilation filter impact the vehicle?

- A clogged PCV filter can lead to increased pressure in the crankcase, which may result in oil leaks, engine sludge buildup, and potential damage to engine components.

4. Can driving with a clogged PCV filter cause further damage to the vehicle?

- Yes, driving with a clogged PCV filter can cause further damage to the engine over time, potentially leading to more severe issues if left unresolved.

5. What are some DIY repair tips for addressing OBDII code P051F?

- DIY repair tips include inspecting and cleaning or replacing the PCV filter, checking for any blockages in the PCV system, and ensuring proper ventilation of the crankcase.

6. Is it safe to drive with the OBDII code P051F present in the vehicle?

- It is not recommended to drive with the P051F code present, as it can lead to engine performance issues and potential damage if not addressed promptly.

7. How can I prevent OBDII code P051F from occurring in the future?

- Regular maintenance, including inspecting and replacing the PCV filter as needed, can help prevent the code from occurring in the future.

8. Can a mechanic easily diagnose and repair OBDII code P051F?

- Yes, a qualified mechanic can diagnose the issue using a diagnostic scanner and perform the necessary repairs, which may include replacing the PCV filter or addressing any blockages in the system.

9. Are there any other related codes that may be triggered along with P051F?

- Other related codes that may be triggered include P051E (Positive Crankcase Ventilation Filter Restriction - Air Flow Below Threshold) and P0520 (Engine Oil Pressure Sensor/Switch Circuit Malfunction).

10. How important is it to address OBDII code P051F promptly?

- It is important to address the P051F code promptly to prevent potential engine damage and ensure optimal vehicle performance.