P0990 2018 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 5 Circuit High Voltage
Quick Answer
The P0990 code on a 2018 Chevrolet Silverado indicates an issue with the transmission fluid pressure switch 5 circuit registering high voltage. Common causes include Faulty transmission fluid pressure switch: The switch itself may be malfunctioning, sending incorrect voltage readings to the transmission control module, Wiring issues: Damaged or corroded wiring connections between the switch and the control module can lead to high voltage readings, Transmission control module malfunction: A problem with the transmission control module can cause it to incorrectly interpret the voltage signals from the pressure switch. 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 2018 Chevrolet Silverado indicates Transmission Fluid Pressure Switch 5 Circuit High Voltage.
- Common causes
- Common causes include Faulty transmission fluid pressure switch: The switch itself may be malfunctioning, sending incorrect voltage readings to the transmission control module, Wiring issues: Damaged or corroded wiring connections between the switch and the control module can lead to high voltage readings, Transmission control module malfunction: A problem with the transmission control module can cause it to incorrectly interpret the voltage signals from the pressure switch.
- 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 2018 Chevrolet Silverado Description
The P0990 code on a 2018 Chevrolet Silverado indicates an issue with the transmission fluid pressure switch 5 circuit registering high voltage. The transmission fluid pressure switch is a crucial component that helps regulate the hydraulic pressure within the transmission system. When this switch detects a high voltage signal, it suggests that there may be an electrical malfunction or a problem with the switch itself. This can lead to improper shifting patterns, reduced fuel efficiency, and potential damage to the transmission system if left unaddressed.
Common Causes of P0990 2018 Chevrolet Silverado
- Faulty transmission fluid pressure switch: The switch itself may be malfunctioning, sending incorrect voltage readings to the transmission control module.
- Wiring issues: Damaged or corroded wiring connections between the switch and the control module can lead to high voltage readings.
- Transmission control module malfunction: A problem with the transmission control module can cause it to incorrectly interpret the voltage signals from the pressure switch.
- Low transmission fluid levels: Insufficient transmission fluid levels can cause the pressure switch to detect high voltage due to the lack of proper hydraulic pressure.
- Internal transmission problems: Issues within the transmission system, such as a clogged filter or a failing solenoid, can also trigger the P0990 code.
Symptoms of P0990 2018 Chevrolet Silverado
- Harsh or delayed shifting: The vehicle may experience rough or delayed shifting between gears, making for a jerky or uncomfortable driving experience.
- Transmission slipping: The transmission may slip out of gear, causing a loss of power and acceleration.
- Illuminated warning light: The check engine light may illuminate on the dashboard, signaling a potential issue with the transmission system.
- Reduced fuel efficiency: A malfunction in the transmission fluid pressure switch can lead to decreased fuel efficiency as the transmission struggles to operate efficiently.
- Transmission overheating: If the transmission fluid pressure switch is not functioning correctly, it can lead to the transmission overheating due to improper fluid pressure regulation.
How to Fix P0990 2018 Chevrolet Silverado
- Diagnostic scan: Begin by using a diagnostic scanner to retrieve the trouble codes and pinpoint the specific issue with the transmission fluid pressure switch 5.
- Inspect wiring and connections: Check the wiring harness and connections leading to the pressure switch to ensure there are no visible signs of damage or corrosion.
- Test the pressure switch: Use a multimeter to test the transmission fluid pressure switch 5 for proper functionality and voltage readings.
- Replace the pressure switch: If the switch is found to be faulty, replace it with a new, OEM-approved component to ensure proper operation.
- Clear codes and test drive: After completing the repair, clear the trouble codes from the vehicle's computer and take the vehicle for a test drive to ensure that the issue has been resolved.
Cost to Fix P0990 2018 Chevrolet Silverado
The typical repair costs for addressing a P0990 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of replacing a transmission fluid pressure switch can range from $150 to $300, including parts and labor. Additional costs may be incurred if there are wiring repairs or other components that need attention. It's important to note that labor rates at auto repair shops can vary widely, with hourly rates typically falling between $80 and $150. Factors such as location, vehicle make and model, and engine type can also affect the overall repair costs. For a more precise estimate, it is recommended to consult with a qualified mechanic or auto repair shop in your area.
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Frequently Asked Questions about P0990 2018 Chevrolet Silverado Code
What does the OBDII code P0990 mean for a 2018 Chevrolet Silverado?
Code P0990 indicates "Transmission Fluid Pressure Switch 5 Circuit High Voltage," which means an electrical issue has been detected in the pressure switch circuit of the transmission.
What are common symptoms of code P0990 in a 2018 Chevrolet Silverado?
Symptoms may include erratic shifting, failure to shift gears, transmission slipping, or an illuminated check engine light.
What causes code P0990 to appear on a 2018 Chevrolet Silverado?
Possible causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the circuit, or issues with the transmission control module (TCM).
Can driving with code P0990 damage my 2018 Chevrolet Silverado?
Yes, driving with this code can lead to further damage to the transmission, reduced performance, or unsafe driving conditions. Addressing the issue promptly is recommended.
How do I diagnose code P0990 on a 2018 Chevrolet Silverado?
Diagnosis typically involves using an OBDII scanner, inspecting the pressure switch and its wiring for damage, and testing the circuit for high voltage signals.
Can a faulty transmission fluid pressure switch cause code P0990?
Yes, a malfunctioning or stuck pressure switch is a common cause of this code and should be inspected during diagnostics.
How can I fix code P0990 on a 2018 Chevrolet Silverado?
Repairs may include replacing the pressure switch, repairing or replacing damaged wiring, or reprogramming the transmission control module if necessary.
Does code P0990 always require replacing the transmission fluid pressure switch?
Not always. The issue could also stem from wiring problems, connector issues, or a malfunctioning TCM, so proper diagnostics are essential.
What tools are needed to fix code P0990 on a 2018 Chevrolet Silverado?
You may need an OBDII scanner, a multimeter for testing voltage, and basic tools for inspecting and repairing wiring or connectors.
Can a low transmission fluid level cause code P0990?
Low transmission fluid typically causes different codes, but ensuring proper fluid levels is always a good first step in diagnosing transmission-related issues.
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