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P0989 2015 GMC Sierra Code - Transmission Fluid Pressure Switch 5 Circuit Low Voltage

Quick Answer

The P0989 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Transmission Fluid Pressure Switch 5 Circuit, specifically a low voltage condition. Common causes include Faulty transmission fluid pressure switch, Damaged wiring or connectors in the circuit, Low transmission fluid levels. 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
P0989 2015 GMC Sierra indicates Transmission Fluid Pressure Switch 5 Circuit Low Voltage.
Common causes
Common causes include Faulty transmission fluid pressure switch, Damaged wiring or connectors in the circuit, Low transmission fluid levels.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0989 2015 GMC Sierra Description

The P0989 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Transmission Fluid Pressure Switch 5 Circuit, specifically a low voltage condition. The transmission fluid pressure switch is responsible for monitoring the hydraulic pressure within the transmission system. In this case, a low voltage reading suggests that there may be a problem with the electrical circuit or the switch itself, which can lead to improper transmission operation.

OBDII Code P0989 2015 GMC Sierra - Transmission Fluid Pressure Switch 5 Circuit Low Voltage
P0989 2015 GMC Sierra Code - Transmission Fluid Pressure Switch 5 Circuit Low Voltage

Common Causes of P0989 2015 GMC Sierra

  1. Faulty transmission fluid pressure switch
  2. Damaged wiring or connectors in the circuit
  3. Low transmission fluid levels
  4. Malfunctioning transmission control module
  5. Electrical issues such as a blown fuse or relay

Symptoms of P0989 2015 GMC Sierra

  1. Erratic shifting patterns
  2. Harsh shifting
  3. Delayed engagement when shifting gears
  4. Transmission slippage
  5. Illumination of the Check Engine Light

How to Fix P0989 2015 GMC Sierra

  1. Begin by using a scan tool to verify the P0989 code and check for any other related codes.
  2. Inspect the wiring and connectors in the transmission fluid pressure switch circuit for any damage or corrosion.
  3. Test the transmission fluid pressure switch for proper operation and replace if necessary.
  4. Check the transmission fluid level and top up if low, ensuring it is at the correct level.
  5. Clear the DTC and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P0989 2015 GMC Sierra

The typical repair costs for addressing a Transmission Fluid Pressure Switch 5 Circuit Low Voltage issue can vary depending on the specific cause of the problem. Parts such as a new transmission fluid pressure switch may cost between $50 to $150, while labor costs can range from $100 to $300. Overall, the total repair cost could fall within the range of $150 to $450. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at auto repair shops. It's recommended to obtain quotes from local shops for a more accurate cost estimate.

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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 P0989 2015 GMC Sierra Code

1. What does the OBDII code P0989 mean on a 2015 GMC Sierra?

P0989 indicates a "Transmission Fluid Pressure Switch 5 Circuit Low Voltage," meaning there is an issue with the electrical signal from the pressure switch responsible for monitoring transmission fluid pressure.

2. What are the common symptoms of code P0989 in a 2015 GMC Sierra?

Symptoms may include harsh or delayed shifting, transmission slipping, reduced fuel efficiency, the transmission going into limp mode, or the check engine light being illuminated.

3. What causes the P0989 code to appear on a 2015 GMC Sierra?

Common causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the circuit, low transmission fluid, or internal transmission issues.

4. Can low transmission fluid cause the P0989 code in my GMC Sierra?

Yes, low or contaminated transmission fluid can lead to improper pressure readings, which may trigger the P0989 code.

5. How do I diagnose the P0989 code on a 2015 GMC Sierra?

Start by checking the transmission fluid level and condition, inspect the wiring and connectors for damage or corrosion, and test the transmission fluid pressure switch with a multimeter.

6. Is it safe to drive a 2015 GMC Sierra with the P0989 code?

Driving with the P0989 code is not recommended, as it may lead to further transmission damage or unsafe driving conditions due to shifting issues.

7. How much does it cost to repair the P0989 code on a 2015 GMC Sierra?

Repair costs vary depending on the issue. Replacing a transmission fluid pressure switch typically costs $150–$300, while fixing wiring issues or internal transmission repairs can be more expensive.

8. Can I fix the P0989 code on my GMC Sierra myself?

If you're experienced with automotive repairs, you may be able to check the wiring, connectors, and fluid levels yourself. However, diagnosing and replacing the pressure switch or addressing internal transmission issues may require professional assistance.

9. Will clearing the P0989 code solve the problem?

Clearing the code will turn off the check engine light temporarily, but it won’t fix the underlying issue. The code will likely return if the problem is not resolved.

10. How can I prevent the P0989 code from occurring on my 2015 GMC Sierra?

Regularly maintain your transmission by checking and replacing the fluid as needed, inspecting wiring and connectors for damage, and addressing any transmission issues promptly.

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