AutoCodes – GMC – P250A 2018 GMC Sierra

P250A 2018 GMC Sierra Code - Engine Oil Level Switch Circuit

Quick Answer

The engine oil level sensor/switch is normally closed with a proper engine oil level. Common causes include Faulty Engine Oil Level Switch, Engine Oil Level Switch harness is open or shorted, Engine Oil Level Switch 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: P250A 2018 GMC Sierra indicates Engine Oil Level Switch Circuit.
Common causes: Common causes include Faulty Engine Oil Level Switch, Engine Oil Level Switch harness is open or shorted, Engine Oil Level Switch 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 175

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 Sep 21, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P250A 2018 GMC Sierra Description

The engine oil level sensor/switch is normally closed with a proper engine oil level. The switch opens when the engine oil level drops below a calibrated level. The Engine Control Module (ECM) monitors the engine oil level signal circuit when the ignition is ON, and the engine is OFF. With the switch in the closed position, the ECM detects a low voltage on the signal circuit. With the switch in the open position, the ECM detects a high voltage on the signal circuit. When high voltage is detected on the signal circuit, the ECM will send a serial data message to the Instrument Panel Cluster (IPC). The IPC will then display a message on the Driver Information Center (DIC) or illuminate a low engine oil level lamp.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects a high voltage on the signal circuit for three consecutive ignition cycles, followed by an ignition OFF event from 15 minutes to greater than 50 minutes, depending on engine oil temperatures.

OBDII Code P250A 2018 GMC Sierra - Engine Oil Level Switch Circuit - AutoCodes.com — P250A 2018 GMC Sierra Code - Engine Oil Level Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P250A 2018 GMC Sierra?

Faulty Engine Oil Level Switch
Engine Oil Level Switch harness is open or shorted
Engine Oil Level Switch circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P250A 2018 GMC Sierra?

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 does this mean?

Code Tech Notes

Low Engine Oil Level Message Lamp (With Diesel Engine) or Engine Oil Level Switch (With Gasoline Engine)

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P250A 2018 GMC Sierra 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 P250A 2018 GMC Sierra code?

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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.

Frequently Asked Questions about P250A 2018 GMC Sierra Code

1. What does the OBDII code P250A mean for a 2018 GMC Sierra?

The P250A code indicates an issue with the Engine Oil Level Switch Circuit, which monitors the oil level sensor's electrical circuit for proper operation.

2. What are the common symptoms of the P250A code in a 2018 GMC Sierra?

Common symptoms include the check engine light turning on, inaccurate oil level readings, and possible engine performance issues if oil is low or improperly monitored.

3. What causes the P250A code to appear in a GMC Sierra?

The code can be triggered by a faulty oil level sensor, damaged wiring or connectors in the sensor circuit, or an issue with the powertrain control module (PCM).

4. Can I drive my 2018 GMC Sierra with the P250A code?

Itâ€™s not recommended to drive for long periods with this code, as it may indicate improper monitoring of oil levels, which could lead to engine damage if the oil level is too low.

5. How do you diagnose the P250A code in a GMC Sierra?

Diagnosis involves using a scan tool to confirm the code, inspecting the oil level sensor and its wiring for damage, and testing the sensor's electrical circuit for proper voltage and continuity.

6. How is the P250A code fixed?

Repairs may include replacing a faulty oil level sensor, repairing or replacing damaged wiring or connectors in the circuit, or reprogramming or replacing the PCM if necessary.

7. What tools are needed to fix the P250A code?

A diagnostic scan tool, multimeter, and basic hand tools are typically required to diagnose and repair the P250A code.

8. How much does it cost to fix the P250A code in a GMC Sierra?

The cost varies depending on the repair needed. Replacing an oil level sensor typically costs $150â€“$300, while wiring repairs or PCM replacement may increase the cost.

9. Can a low oil level cause the P250A code?

While the code itself is related to the sensor circuit, a persistently low oil level can damage the sensor or its functionality, contributing to the issue.

10. How can I prevent the P250A code from returning?

Regularly check and maintain proper oil levels, ensure the oil level sensor and wiring are in good condition, and address any engine oil-related issues promptly.