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P0990 Chevrolet Code - Transmission Fluid Pressure Switch 5 Circuit High Voltage

Quick Answer

The P0990 Chevrolet diagnostic trouble code (DTC) specifically relates to the Transmission Fluid Pressure Switch 5 Circuit High Voltage. Common causes include Faulty transmission fluid pressure switch: The switch itself may be malfunctioning, sending incorrect voltage signals to the TCM, Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electrical signals between the pressure switch and the TCM, Transmission fluid contamination: Contaminated or degraded transmission fluid can affect the pressure switch's operation. 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 Chevrolet 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 signals to the TCM, Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electrical signals between the pressure switch and the TCM, Transmission fluid contamination: Contaminated or degraded transmission fluid can affect the pressure switch's operation.
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 07, 2024
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Code P0990 Chevrolet Description

The P0990 Chevrolet diagnostic trouble code (DTC) specifically relates to the Transmission Fluid Pressure Switch 5 Circuit High Voltage. This code indicates that the transmission control module (TCM) has detected an abnormally high voltage signal from the transmission fluid pressure switch 5. The transmission fluid pressure switch is responsible for monitoring the hydraulic pressure within the transmission system and sending the appropriate signals to the TCM. When the voltage signal is higher than expected, it can indicate a malfunction or issue with the switch, wiring, or related components.

OBDII Code P0990 Chevrolet - Transmission Fluid Pressure Switch 5 Circuit High Voltage
P0990 Chevrolet Code - Transmission Fluid Pressure Switch 5 Circuit High Voltage

Common Causes of P0990 Chevrolet

  1. Faulty transmission fluid pressure switch: The switch itself may be malfunctioning, sending incorrect voltage signals to the TCM.
  2. Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electrical signals between the pressure switch and the TCM.
  3. Transmission fluid contamination: Contaminated or degraded transmission fluid can affect the pressure switch's operation.
  4. Internal transmission problems: Issues within the transmission system, such as a failing solenoid or valve body, can impact pressure levels.
  5. TCM malfunction: A malfunctioning TCM can misinterpret voltage signals from the pressure switch, triggering the code.

Symptoms of P0990 Chevrolet

  1. Harsh or delayed shifting: The vehicle may experience abrupt or delayed gear shifts, impacting the overall driving experience.
  2. Transmission slipping: The transmission may slip out of gear or struggle to maintain consistent power delivery.
  3. Illuminated warning light: The check engine light or transmission warning light may illuminate on the dashboard.
  4. Decreased fuel efficiency: The vehicle may consume more fuel than usual due to inefficient transmission operation.
  5. Transmission overheating: The transmission system may overheat due to abnormal pressure levels, leading to potential damage.

How to Fix P0990 Chevrolet

  1. Diagnostic scan: Use a diagnostic scanner to retrieve the specific DTC and confirm the presence of code P0990 Chevrolet.
  2. Inspect pressure switch: Inspect the transmission fluid pressure switch 5 for any signs of damage or malfunction.
  3. Check wiring: Inspect the wiring harness and connections related to the pressure switch for any damage or corrosion.
  4. Replace pressure switch: If the pressure switch is faulty, replace it with a new, OEM-quality component.
  5. Clear codes and test drive: Clear the DTC from the TCM's memory, then test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0990 Chevrolet

The typical repair costs for addressing the P0990 Chevrolet code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair costs for this problem can range from $200 to $500, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can fluctuate based on location, vehicle make and model, and engine type. Therefore, it's recommended to obtain quotes from local auto repair shops to get a more accurate estimate for your specific situation.

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Information for Specific Chevrolet Models

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 P0990 Chevrolet Code

1. What are the common symptoms of OBDII code P0990 in a Chevrolet related to Transmission Fluid Pressure Switch 5 Circuit High Voltage?

Common symptoms include harsh shifting, transmission slipping, illuminated Check Engine Light, and decreased fuel efficiency.

2. What are the potential causes of OBDII code P0990 in a Chevrolet indicating Transmission Fluid Pressure Switch 5 Circuit High Voltage?

Potential causes may include a faulty transmission fluid pressure switch, damaged wiring or connectors, low transmission fluid levels, or internal transmission issues.

3. How can I diagnose OBDII code P0990 in my Chevrolet indicating Transmission Fluid Pressure Switch 5 Circuit High Voltage?

Diagnosis typically involves using a scan tool to read the code, inspecting the transmission fluid pressure switch and related components, checking for wiring issues, and performing a thorough transmission fluid level and condition check.

4. Can I continue driving my Chevrolet with OBDII code P0990 related to Transmission Fluid Pressure Switch 5 Circuit High Voltage?

It is not recommended to continue driving with this code, as it can lead to further transmission damage and potential safety risks. It is advisable to address the issue promptly.

5. How can I repair OBDII code P0990 in my Chevrolet indicating Transmission Fluid Pressure Switch 5 Circuit High Voltage?

Repair methods may include replacing the transmission fluid pressure switch, repairing or replacing damaged wiring or connectors, addressing low transmission fluid levels, or seeking professional help for internal transmission repairs.

6. Are there any DIY tips for troubleshooting OBDII code P0990 in a Chevrolet related to Transmission Fluid Pressure Switch 5 Circuit High Voltage?

DIY tips may include checking for visible wiring issues, ensuring proper transmission fluid levels and condition, and consulting the vehicle's service manual for specific diagnostic and repair procedures.

7. Is it necessary to reset the Check Engine Light after repairing OBDII code P0990 in a Chevrolet?

Yes, it is recommended to reset the Check Engine Light using a scan tool after repairing the underlying issue causing OBDII code P0990 to ensure proper functioning and monitoring of the vehicle's systems.

8. Can a faulty transmission fluid pressure switch cause other transmission-related issues in a Chevrolet besides triggering OBDII code P0990?

Yes, a faulty transmission fluid pressure switch can cause various transmission-related issues such as erratic shifting, transmission slipping, and improper torque converter lockup, in addition to triggering specific trouble codes like P0990.

9. How much does it typically cost to repair OBDII code P0990 related to Transmission Fluid Pressure Switch 5 Circuit High Voltage in a Chevrolet?

The cost of repair can vary depending on the underlying cause, parts needed, labor rates, and whether the repair is done at a dealership or an independent repair shop. It is advisable to get estimates from multiple sources.

10. Is it possible for OBDII code P0990 in a Chevrolet to reoccur after repair?

If the underlying issue causing the code is not fully addressed or if there are other related problems present, OBDII code P0990 may reoccur. It is crucial to ensure proper diagnosis and repair to prevent recurrence.

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