AutoCodes – Generic – P252B

P252B Code - Engine Oil Quality Sensor Circuit Range/Performance

Quick Answer

The Powertrain Control Module (PCM) monitors the Engine Oil Quality Sensor Circuit. Common causes include Faulty Engine Oil Quality Sensor, Engine Oil Quality Sensor harness is open or shorted, Engine Oil Quality 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: P252B indicates Engine Oil Quality Sensor Circuit Range/Performance.
Common causes: Common causes include Faulty Engine Oil Quality Sensor, Engine Oil Quality Sensor harness is open or shorted, Engine Oil Quality 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 4,963

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P252B Description

The Powertrain Control Module (PCM) monitors the Engine Oil Quality Sensor Circuit. The PCM sets the OBDII code when the Engine Oil Quality Sensor signal is out of factory specifications.

OBDII Code P252B - Engine Oil Quality Sensor Circuit Range/Performance - AutoCodes.com — P252B Code - Engine Oil Quality Sensor Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P252B?

Faulty Engine Oil Quality Sensor
Engine Oil Quality Sensor harness is open or shorted
Engine Oil Quality Sensor circuit poor electrical connection

How to Fix the DTC P252B?

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 P252B 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.

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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.