P0989 2016 GMC Sierra Code - Transmission Fluid Pressure Switch 5 Circuit Low Voltage
Quick Answer
The P0989 diagnostic trouble code (DTC) indicates an issue with the Transmission Fluid Pressure Switch 5 Circuit Low Voltage in a 2016 GMC Sierra. Common causes include Faulty transmission fluid pressure switch, Wiring issues or poor connection in the pressure switch circuit, Low transmission fluid level or contaminated fluid. 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 2016 GMC Sierra indicates Transmission Fluid Pressure Switch 5 Circuit Low Voltage.
- Common causes
- Common causes include Faulty transmission fluid pressure switch, Wiring issues or poor connection in the pressure switch circuit, Low transmission fluid level or contaminated fluid.
- 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 P0989 2016 GMC Sierra Description
The P0989 diagnostic trouble code (DTC) indicates an issue with the Transmission Fluid Pressure Switch 5 Circuit Low Voltage in a 2016 GMC Sierra. This code specifically refers to a low voltage condition detected in the transmission fluid pressure switch circuit designated as "5" by the vehicle's control module. The transmission fluid pressure switch plays a crucial role in monitoring and regulating the pressure of the transmission fluid within the transmission system. The switch sends voltage signals to the vehicle's control module, which uses this information to adjust the transmission's shifting patterns and ensure optimal performance.
Common Causes of P0989 2016 GMC Sierra
- Faulty transmission fluid pressure switch
- Wiring issues or poor connection in the pressure switch circuit
- Low transmission fluid level or contaminated fluid
- Faulty control module
- Electrical problems such as a blown fuse or short circuit
Symptoms of P0989 2016 GMC Sierra
- Harsh or delayed shifting
- Transmission slipping
- Illumination of the Check Engine Light
- Reduced fuel efficiency
- Difficulty engaging gears
How to Fix P0989 2016 GMC Sierra
- Diagnose the issue using a scan tool to verify the P0989 code and determine the exact cause of the low voltage condition.
- Inspect the transmission fluid pressure switch and its wiring for any signs of damage or corrosion.
- Check the transmission fluid level and condition, topping up or replacing it if necessary.
- Test the control module for proper function and replace if found to be faulty.
- Clear the DTC and test drive the vehicle to ensure proper transmission operation.
Cost to Fix P0989 2016 GMC Sierra
The cost of repairing a P0989 code in a 2016 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repair needed. On average, the parts for this repair, including a new transmission fluid pressure switch or control module, can range from $100 to $300. Labor costs at an auto repair shop typically range from $80 to $150 per hour, with the total repair bill likely falling between $200 and $500. Please note that these estimates are general guidelines, and actual costs may vary based on factors such as location, vehicle make and model, and the shop's labor rates. It is recommended to obtain a detailed quote from a qualified mechanic for a more accurate cost estimate.
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Frequently Asked Questions about P0989 2016 GMC Sierra Code
1. What does the OBDII code P0989 mean on a 2016 GMC Sierra?
The P0989 code indicates "Transmission Fluid Pressure Switch 5 Circuit Low Voltage," meaning the transmission control module (TCM) is detecting a low voltage issue in the circuit of pressure switch 5.
2. What are the common symptoms of the P0989 code in a 2016 GMC Sierra?
Symptoms may include harsh or delayed shifting, transmission slipping, poor acceleration, the transmission going into limp mode, and an illuminated check engine light.
3. What causes the P0989 code to appear on a 2016 GMC Sierra?
Common causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the circuit, low transmission fluid levels, or a malfunctioning transmission control module (TCM).
4. Can low transmission fluid cause the P0989 code on a 2016 GMC Sierra?
Yes, low or contaminated transmission fluid can lead to improper pressure readings, potentially triggering the P0989 code.
5. How do you diagnose the P0989 code in a 2016 GMC Sierra?
Diagnosis involves scanning for additional codes, inspecting the wiring and connectors to the pressure switch, testing the switch itself, and checking the transmission fluid level and condition.
6. Can I drive my 2016 GMC Sierra with the P0989 code?
Driving with the P0989 code is not recommended, as it can lead to further transmission damage or unsafe driving conditions due to shifting issues.
7. How is the P0989 code fixed on a 2016 GMC Sierra?
Repairs may include replacing the faulty pressure switch, repairing damaged wiring or connectors, topping off or flushing the transmission fluid, or reprogramming or replacing the TCM.
8. How much does it cost to fix the P0989 code on a 2016 GMC Sierra?
Repair costs vary but can range from $150 to $400 for pressure switch replacement, while more complex issues like TCM replacement may cost $500 or more.
9. Can a faulty TCM cause the P0989 code in a 2016 GMC Sierra?
Yes, a malfunctioning transmission control module can incorrectly interpret signals from the pressure switch, triggering the P0989 code.
10. How can I prevent the P0989 code from occurring in my 2016 GMC Sierra?
Regular maintenance such as checking transmission fluid levels, keeping the fluid clean, and inspecting wiring and connectors for damage can help prevent the P0989 code.
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