AutoCodes – Buick – P1189 Buick

P1189 Buick Code - Engine Oil Pressure Switch Fault

Quick Answer

The low oil pressure sensor is normally closed. Common causes include Faulty Engine Oil Pressure Switch, Engine Oil Pressure Switch harness is open or shorted, Engine Oil Pressure 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: P1189 Buick indicates Engine Oil Pressure Switch Fault.
Common causes: Common causes include Faulty Engine Oil Pressure Switch, Engine Oil Pressure Switch harness is open or shorted, Engine Oil Pressure 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 21,656

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1189 Buick Description

The low oil pressure sensor is normally closed. When oil pressure increases above 1 to 4.5 psi the switch contacts open. The Powertrain Control Module (PCM) supplies 12 volts to the oil pressure input circuit. With low oil pressure the 12 volts is pulled low to ground. This diagnostic tests for a open condition of the oil pressure switch circuit. If the engine has been off long enough for engine temperature to drop by 10Â°C, then a shorted (low oil pressure) condition of the circuit should be observed prior to engine running.

OBDII Code P1189 Buick - Engine Oil Pressure Switch Fault - AutoCodes.com — P1189 Buick Code - Engine Oil Pressure Switch Fault

What does this mean?

What are the Possible Causes of the DTC P1189 Buick?

Faulty Engine Oil Pressure Switch
Engine Oil Pressure Switch harness is open or shorted
Engine Oil Pressure Switch circuit poor electrical connection

How to Fix the DTC P1189 Buick?

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 P1189 Buick 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 P1189 Buick code?

Need more information on how to fix the P1189 Buick code? Get Access to Factory Service Manuals

Need Help with the 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 P1189 Buick Code

1. What are the common symptoms of OBDII code P1189 in a Buick related to the Engine Oil Pressure Switch Fault?

- Common symptoms include illuminated check engine light, oil pressure warning light, loss of oil pressure, and engine performance issues.

2. What are the possible causes of OBDII code P1189 in a Buick indicating an Engine Oil Pressure Switch Fault?

- Possible causes may include a faulty oil pressure switch, wiring issues, low engine oil level, oil contamination, or a malfunctioning oil pressure sensor.

3. How can I diagnose the OBDII code P1189 in my Buick for an Engine Oil Pressure Switch Fault?

- Diagnosis involves using an OBDII scanner to retrieve the specific fault code, inspecting the oil pressure switch and related wiring, checking the engine oil level and quality, and testing the oil pressure sensor.

4. Can I continue driving my Buick with OBDII code P1189 indicating an Engine Oil Pressure Switch Fault?

- It is not recommended to continue driving with this fault code as it can lead to potential engine damage due to loss of oil pressure. It is best to address the issue promptly.

5. What are some repair tips for resolving OBDII code P1189 in a Buick related to an Engine Oil Pressure Switch Fault?

- Repair tips may include replacing the faulty oil pressure switch, repairing any damaged wiring, ensuring the engine oil level is adequate, and performing an oil change if necessary.

6. How much does it typically cost to repair OBDII code P1189 on a Buick for an Engine Oil Pressure Switch Fault?

- The cost of repair can vary depending on the exact cause of the issue. Replacing the oil pressure switch or sensor can range from $50 to $200, while additional repairs may incur extra costs.

7. Can a DIY enthusiast fix OBDII code P1189 indicating an Engine Oil Pressure Switch Fault in a Buick?

- Depending on your skill level and access to tools, DIY enthusiasts may be able to replace the oil pressure switch themselves. However, it is recommended to consult a professional if unsure.

8. How urgent is it to address OBDII code P1189 for an Engine Oil Pressure Switch Fault in a Buick?

- It is crucial to address this issue promptly to prevent potential engine damage from low oil pressure. Ignoring the fault code can lead to more severe problems over time.

9. Are there any preventive measures to avoid OBDII code P1189 related to an Engine Oil Pressure Switch Fault in a Buick?

- Regularly checking and maintaining proper engine oil levels, changing the oil as recommended, and inspecting the oil pressure switch during routine maintenance can help prevent this issue.

10. Is OBDII code P1189 Buick indicating an Engine Oil Pressure Switch Fault a common issue in certain models?

- While the occurrence may vary, some Buick models may be more prone to experiencing this fault due to factors like age, mileage, and maintenance history.