P0990 2017 GMC Sierra Code - Transmission Fluid Pressure Switch 5 Circuit High Voltage
Quick Answer
The P0990 diagnostic trouble code (DTC) for the 2017 GMC Sierra refers to the Transmission Fluid Pressure Switch 5 Circuit High Voltage. Common causes include Faulty transmission fluid pressure switch, Wiring or connection issues in the transmission pressure switch circuit, Low transmission fluid level or poor quality 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
- P0990 2017 GMC Sierra indicates Transmission Fluid Pressure Switch 5 Circuit High Voltage.
- Common causes
- Common causes include Faulty transmission fluid pressure switch, Wiring or connection issues in the transmission pressure switch circuit, Low transmission fluid level or poor quality 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 P0990 2017 GMC Sierra Description
The P0990 diagnostic trouble code (DTC) for the 2017 GMC Sierra refers to the Transmission Fluid Pressure Switch 5 Circuit High Voltage. This code is triggered when the onboard computer detects an abnormally high voltage signal from the transmission fluid pressure switch 5 circuit. The transmission fluid pressure switch is responsible for monitoring the hydraulic pressure within the transmission system and signaling the computer to make necessary adjustments.
Common Causes of P0990 2017 GMC Sierra
- Faulty transmission fluid pressure switch
- Wiring or connection issues in the transmission pressure switch circuit
- Low transmission fluid level or poor quality fluid
- Internal transmission pressure regulation problems
- Electronic control module (ECM) malfunction
Symptoms of P0990 2017 GMC Sierra
- Harsh or delayed shifting
- Slipping gears
- Transmission overheating
- Illuminated transmission warning light
- Reduced fuel efficiency
How to Fix P0990 2017 GMC Sierra
- Begin by conducting a thorough inspection of the transmission fluid pressure switch and its wiring harness to check for any visible damage or corrosion. Replace the switch if necessary.
- Check the transmission fluid level and quality. Top up or replace the fluid if it is low or contaminated.
- Inspect the transmission control module (TCM) for any faults or error codes. Clear any stored codes and reset the system.
- Test drive the vehicle to monitor the transmission's performance and ensure that the issue has been resolved. If the code persists, further diagnostic testing may be required.
- If the problem persists after these steps, consult a professional mechanic or transmission specialist for a more in-depth diagnosis and repair.
Cost to Fix P0990 2017 GMC Sierra
The repair costs for addressing a P0990 code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the total cost for parts and labor can range from $200 to $500. This estimate includes the cost of a new transmission fluid pressure switch, any necessary transmission fluid, and the labor charges for diagnosis and repair. Additional costs may apply if further diagnostic testing or repairs are needed. It is advisable to consult with a trusted mechanic or dealership to get a more accurate estimate based on your vehicle's make and model. Labor rates typically range from $80 to $150 per hour, but can vary based on location and shop rates.
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Frequently Asked Questions about P0990 2017 GMC Sierra Code
1. What does the OBDII code P0990 mean on a 2017 GMC Sierra?
P0990 indicates a "Transmission Fluid Pressure Switch 5 Circuit High Voltage," meaning the powertrain control module (PCM) has detected an abnormal voltage reading in the circuit associated with the transmission fluid pressure switch 5.
2. What are the symptoms of code P0990 on a 2017 GMC Sierra?
Common symptoms include harsh or delayed shifting, the transmission stuck in one gear (limp mode), the check engine light illuminated, and potentially reduced fuel efficiency.
3. What causes the P0990 code to appear on a 2017 GMC Sierra?
Possible causes include a faulty transmission fluid pressure switch, damaged or corroded wiring or connectors in the circuit, a malfunctioning PCM, or low or contaminated transmission fluid.
4. Can low transmission fluid cause a P0990 code on a 2017 GMC Sierra?
Yes, low or contaminated transmission fluid can lead to improper pressure readings, which may trigger the P0990 code.
5. How do you diagnose the P0990 code on a 2017 GMC Sierra?
Diagnosis involves scanning for additional trouble codes, inspecting the transmission fluid for proper level and condition, checking the wiring and connectors in the pressure switch circuit, and testing the pressure switch itself.
6. Is it safe to drive a 2017 GMC Sierra with the P0990 code?
Driving with the P0990 code is not recommended as it can lead to further transmission damage or unsafe driving conditions due to shifting issues.
7. How is the P0990 code fixed on a 2017 GMC Sierra?
Repairs may include replacing the faulty transmission fluid pressure switch, repairing or replacing damaged wiring/connectors, flushing and refilling the transmission fluid, or reprogramming or replacing the PCM if needed.
8. How much does it cost to repair the P0990 code on a 2017 GMC Sierra?
The cost depends on the root cause but typically ranges from $150 to $500 for parts and labor, with the pressure switch replacement being on the lower end and PCM replacement on the higher end.
9. Can a faulty PCM cause the P0990 code on a 2017 GMC Sierra?
Yes, a malfunctioning PCM can misinterpret voltage readings from the pressure switch circuit and trigger the P0990 code.
10. How can I prevent the P0990 code from recurring on my 2017 GMC Sierra?
Regular maintenance, such as ensuring proper transmission fluid levels and condition, inspecting wiring and connectors for damage, and addressing transmission issues promptly, can help prevent this code.
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