P0990 2014 GMC Sierra Code - Transmission Fluid Pressure Switch 5 Circuit High Voltage
Quick Answer
The P0990 diagnostic trouble code (DTC) for the 2014 GMC Sierra specifically refers to the Transmission Fluid Pressure Switch 5 Circuit High Voltage. Common causes include Faulty transmission fluid pressure switch 5, Damaged wiring or connectors in the circuit, Malfunctioning transmission control module. 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
- P0990 2014 GMC Sierra indicates Transmission Fluid Pressure Switch 5 Circuit High Voltage.
- Common causes
- Common causes include Faulty transmission fluid pressure switch 5, Damaged wiring or connectors in the circuit, Malfunctioning transmission control module.
- 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 P0990 2014 GMC Sierra Description
The P0990 diagnostic trouble code (DTC) for the 2014 GMC Sierra specifically refers to the Transmission Fluid Pressure Switch 5 Circuit High Voltage. This code indicates that there is a high voltage condition detected in the circuit related to the transmission fluid pressure switch 5. The transmission fluid pressure switch is a crucial component in the vehicle's transmission system that helps monitor and regulate the pressure of the transmission fluid.
Common Causes of P0990 2014 GMC Sierra
- Faulty transmission fluid pressure switch 5.
- Damaged wiring or connectors in the circuit.
- Malfunctioning transmission control module.
- Low transmission fluid levels or contaminated fluid.
- Electrical issues such as a short circuit or corrosion in the circuit.
Symptoms of P0990 2014 GMC Sierra
- Erratic shifting or hesitation when changing gears.
- Harsh engagement when shifting into gear.
- Transmission slipping or jerking during acceleration.
- Illumination of the Check Engine Light on the dashboard.
- Reduced fuel efficiency due to transmission inefficiency.
How to Fix P0990 2014 GMC Sierra
- Begin by conducting a thorough inspection of the transmission fluid pressure switch 5 and its circuit to identify any visible damage or issues.
- Test the transmission fluid pressure switch 5 using a multimeter to determine if it is functioning correctly.
- Inspect the wiring and connectors in the circuit for any signs of damage, corrosion, or loose connections.
- Check the transmission control module for any fault codes or malfunctions that may be contributing to the high voltage condition.
- Replace the faulty transmission fluid pressure switch 5, repair any damaged wiring or connectors, and reset the transmission control module to clear the DTC.
Cost to Fix P0990 2014 GMC Sierra
The typical repair costs for addressing the P0990 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a transmission fluid pressure switch 5 can range from $150 to $300, including parts and labor. Additional costs may be incurred for repairing damaged wiring or connectors, or addressing issues with the transmission control module. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates at auto repair shops can vary, so it's recommended to inquire about rates in your local area for a more precise cost estimate.
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Frequently Asked Questions about P0990 2014 GMC Sierra Code
1. What does the OBDII code P0990 mean on a 2014 GMC Sierra?
P0990 indicates a "Transmission Fluid Pressure Switch 5 Circuit High Voltage," meaning the transmission control module (TCM) has detected a high voltage signal from the pressure switch 5 circuit.
2. What are the common symptoms of the P0990 code in a 2014 GMC Sierra?
Symptoms may include harsh or delayed shifting, transmission slipping, the check engine light turning on, and possibly entering limp mode.
3. What causes the P0990 code to appear in a 2014 GMC Sierra?
Common causes include a faulty transmission fluid pressure switch, damaged or corroded wiring in the circuit, a shorted or open circuit, or a malfunctioning TCM.
4. Can driving with the P0990 code damage my 2014 GMC Sierra?
Driving with this code may lead to further transmission damage if the underlying issue isn’t resolved promptly, especially if the transmission is slipping or experiencing shifting issues.
5. How do I diagnose the P0990 code on my 2014 GMC Sierra?
Diagnosis typically involves inspecting the transmission fluid pressure switch, checking the wiring and connectors for damage or corrosion, and testing voltage and continuity in the circuit.
6. How can I fix the P0990 code on a 2014 GMC Sierra?
Repairs may include replacing the faulty pressure switch, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming or replacing the TCM if needed.
7. Can low transmission fluid cause the P0990 code in a 2014 GMC Sierra?
Low or contaminated transmission fluid typically does not directly cause this code but can contribute to transmission problems, so checking and maintaining proper fluid levels is essential.
8. How much does it cost to fix the P0990 code on a 2014 GMC Sierra?
Repair costs vary depending on the cause. Replacing a pressure switch can cost $150–$300, while wiring repairs or TCM replacement could be more expensive.
9. Can I reset the P0990 code without repairing the issue?
Clearing the code without fixing the problem may temporarily turn off the check engine light, but the code will likely return if the underlying issue persists.
10. Is the P0990 code specific to GMC vehicles?
No, the P0990 code is a generic OBDII code and can appear in other vehicles with similar transmission systems, but diagnostics and repairs may vary by make and model.
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