AutoCodes – Chevrolet – P0990 Chevrolet

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

Quick Answer

The Transmission Fluid Pressure (TFP) switch 5 is part of the Transmission Control Solenoid Valve Assembly, which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly. 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 Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly.
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 Popularity 1,579

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0990 Chevrolet Description

The Transmission Fluid Pressure (TFP) switch 5 is part of the Transmission Control Solenoid Valve Assembly, which has no serviceable parts. The Transmission Control Module (TCM) supplies a signal circuit to the TFP switch 5. The TFP switch 5 has an internal case ground. TFP switch 5 is normally closed or LOW. When oil pressure is present at the TFP switch 5, the switch is open or HIGH. The normally high-pressure control (PC) solenoid 3 controls pressure to the R1/4-5-6 clutch regular valve. The TCM monitors the TFP switch 5 signal circuit to determine the position of the R1/4-5-6 clutch regulator valve. When the low and reverse clutch and 4-5-6 clutch are commanded OFF, pressure is present on the TFP switch 5. When the low and reverse clutch or the 4-5-6 clutch is commanded ON, the R1/4-5-6 clutch regulator valve moves, and pressure to the TFP switch 5 is exhausted through the R1/4-5-6 clutch regulator valve. The Diagnostic Trouble Code (DTC) will be set when the TCM detects that the TFP switch 5 signal voltage remains HIGH after the 4-5-6 clutch transitions from a LOW pressure state to a HIGH pressure state. The TCM counts each incident. The DTC sets when 15 counts are accumulated.

OBDII Code P0990 Chevrolet - Transmission Fluid Pressure Switch 5 Circuit High Voltage - AutoCodes.com — P0990 Chevrolet Code - Transmission Fluid Pressure Switch 5 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0990 Chevrolet?

Low transmission fluid level
Dirty transmission fluid
Faulty Transmission Control Solenoid Valve Assembly
Transmission Control Solenoid Valve Assembly harness is open or shorted
Transmission Control Solenoid Valve Assembly circuit poor electrical connection

How to Fix the DTC P0990 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0990 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0990 Chevrolet code?

Need more information on how to fix the P0990 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0990 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P0990 2014 Chevrolet Silverado — Transmission Fluid Pressure Switch 5 Circuit High Voltage
P0990 2015 Chevrolet Silverado — Transmission Fluid Pressure Switch 5 Circuit High Voltage
P0990 2016 Chevrolet Silverado — Transmission Fluid Pressure Switch 5 Circuit High Voltage
P0990 2017 Chevrolet Silverado — Transmission Fluid Pressure Switch 5 Circuit High Voltage
P0990 2018 Chevrolet Silverado — Transmission Fluid Pressure Switch 5 Circuit High Voltage

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.