AutoCodes – Generic – P051B

P051B Code - Crankcase Pressure Sensor Circuit Range/Performance

Quick Answer

The Engine Control Module (ECM) monitors the Crankcase Pressure Sensor signal. Common causes include Faulty Crankcase Pressure Sensor, Crankcase Pressure Sensor harness is open or shorted, Crankcase Pressure Sensor circuit poor electrical connection. 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: P051B indicates Crankcase Pressure Sensor Circuit Range/Performance.
Common causes: Common causes include Faulty Crankcase Pressure Sensor, Crankcase Pressure Sensor harness is open or shorted, Crankcase Pressure Sensor circuit poor electrical connection.
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 13,437

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
Comments
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Code P051B 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 P051B - Crankcase Pressure Sensor Circuit Range/Performance - AutoCodes.com — P051B Code - Crankcase Pressure Sensor Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P051B?

Faulty Crankcase Pressure Sensor
Crankcase Pressure Sensor harness is open or shorted
Crankcase Pressure Sensor circuit poor electrical connection

How to Fix the DTC P051B?

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 P051B 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 P051B code?

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Information for Specific Makes

P051B Dodge — Crankcase Pressure Sensor Circuit Range/Performance
P051B Ford — Crankcase Pressure Sensor Circuit Range/Performance

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.