AutoCodes – Cadillac – P0990 Cadillac

P0990 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 592

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P0990 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

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

Need Help with the Code?

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

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 Cadillac Code

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

- Common symptoms include harsh shifting, transmission slippage, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P0990 in a Cadillac?

- The code P0990 can be triggered by issues such as a faulty transmission fluid pressure switch, wiring or connector issues, low transmission fluid levels, or a malfunctioning transmission control module.

3. How can I diagnose OBDII code P0990 in a Cadillac related to the Transmission Fluid Pressure Switch 5 Circuit High Voltage?

- Diagnosis typically involves using an OBDII scanner to read the code, inspecting the transmission fluid pressure switch and related components, and testing the electrical circuit for proper voltage and continuity.

4. Can I still drive my Cadillac with OBDII code P0990 present?

- It is not recommended to continue driving the vehicle with code P0990 present, as it can lead to further transmission damage and potentially unsafe driving conditions.

5. What are the repair options for resolving OBDII code P0990 in a Cadillac?

- Repair options may include replacing the faulty transmission fluid pressure switch, repairing any damaged wiring or connectors, topping up or replacing transmission fluid, or reprogramming the transmission control module.

6. How much does it typically cost to repair OBDII code P0990 in a Cadillac?

- The cost of repairing OBDII code P0990 can vary depending on the specific issue causing the code. Costs may range from a few hundred dollars for minor repairs to over a thousand dollars for more extensive transmission repairs.

7. Can I clear OBDII code P0990 in a Cadillac myself?

- While you can clear the code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Is OBDII code P0990 a common issue in Cadillac vehicles?

- OBDII code P0990 related to the Transmission Fluid Pressure Switch 5 Circuit High Voltage is not as common as some other codes, but it can still occur in Cadillac vehicles, especially in older models or those with high mileage.

9. Are there any preventative maintenance steps to avoid OBDII code P0990 in a Cadillac?

- Regularly checking and maintaining proper transmission fluid levels, addressing any leaks promptly, and conducting routine transmission inspections can help prevent issues that may trigger code P0990.

10. Can a DIY enthusiast with automotive knowledge repair OBDII code P0990 in a Cadillac?

- Depending on the specific issue causing the code, a DIY enthusiast with adequate automotive knowledge and tools may be able to diagnose and repair OBDII code P0990. However, more complex transmission problems may require professional assistance.