AutoCodes – Chevrolet – P0990 2014 Chevrolet Silverado

P0990 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado 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 309

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
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Code P0990 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado - Transmission Fluid Pressure Switch 5 Circuit High Voltage - AutoCodes.com — P0990 2014 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 5 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0990 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P0990 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2014 Chevrolet Silverado Code

What does the OBDII code P0990 mean on a 2014 Chevrolet Silverado?

The P0990 code indicates a high voltage issue in the Transmission Fluid Pressure Switch 5 Circuit, which helps monitor and regulate transmission fluid pressure.

What are the common symptoms of the P0990 code?

Symptoms may include harsh or delayed shifting, the transmission stuck in one gear, poor fuel efficiency, and the Check Engine Light being illuminated.

What causes the P0990 code to appear on a 2014 Chevrolet Silverado?

Common causes include faulty pressure switches, damaged wiring or connectors in the circuit, a failing transmission control module (TCM), or low transmission fluid levels.

Can I continue driving my Silverado with the P0990 code?

Driving with this code is not recommended, as it may lead to further transmission damage or unsafe driving conditions due to shifting issues.

How do I diagnose the P0990 code in my truck?

Start by checking the transmission fluid level and condition, inspecting wiring and connectors for damage, and testing the pressure switch and circuit for proper voltage and resistance.

What should I check first if my Silverado shows the P0990 code?

Begin by checking the transmission fluid for proper level and cleanliness, as low or dirty fluid can contribute to sensor malfunctions.

How much does it cost to repair the P0990 code?

Repair costs vary depending on the issue, ranging from $100 for simple wiring repairs to $300 or more for replacing the pressure switch or related components.

Is the P0990 code related to transmission failure?

While the P0990 code itself doesnâ€™t indicate total transmission failure, ignoring it can lead to further damage and expensive repairs if not addressed promptly.

Can a software update fix the P0990 code?

In some cases, a TCM software update from the dealer may resolve the issue if the problem is related to the control module's programming.

Do I need a professional mechanic to fix the P0990 code?

While basic checks like inspecting fluid or wiring can be done at home, diagnosing and repairing transmission circuits often requires specialized tools and expertise.