AutoCodes – GMC – P2720 2018 GMC Sierra

P2720 2018 GMC Sierra Code - Pressure Control Solenoid 4 Control Circuit Low Voltage

Quick Answer

The pressure control solenoid 4 is part of the control solenoid valve assembly which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty 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: P2720 2018 GMC Sierra indicates Pressure Control Solenoid 4 Control Circuit Low Voltage.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty 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 180

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 P2720 2018 GMC Sierra Description

The pressure control solenoid 4 is part of the control solenoid valve assembly which has no serviceable parts. The normally low-pressure control solenoid 4 regulates and directs oil pressure to the 2-6 clutch regulator valve. Increasing pressure control solenoid 4 pressure increases pressure to the 2-6 clutch regulator valve. The Transmission Control Module (TCM) varies the current to the pressure control solenoid 4 through a low-side driver. Increasing the current to pressure control solenoid 4 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to pressure control solenoid 4 decreases oil pressure by opening the exhaust port. Pressure control solenoid 4 power is supplied by the Transmission Control Module through a high side driver. The high-side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected the high-side driver will reset.
The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module detects a short to ground on the pressure control solenoid 4 control circuit for 1 s.

OBDII Code P2720 2018 GMC Sierra - Pressure Control Solenoid 4 Control Circuit Low Voltage - AutoCodes.com — P2720 2018 GMC Sierra Code - Pressure Control Solenoid 4 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2720 2018 GMC Sierra?

Low transmission fluid level
Dirty transmission fluid
Faulty Control Solenoid Valve Assembly
Control Solenoid Valve Assembly harness or connectors
Control Solenoid Valve Assembly circuit is open or shorted

How to Fix the DTC P2720 2018 GMC Sierra?

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 P2720 2018 GMC Sierra 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 P2720 2018 GMC Sierra 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 P2720 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2720 in a 2018 GMC Sierra?

- Common symptoms include transmission shifting issues, decreased fuel efficiency, and the illumination of the Check Engine light.

2. What does the OBDII code P2720 on a 2018 GMC Sierra indicate?

- The code P2720 indicates a low voltage condition in the Pressure Control Solenoid 4 Control Circuit.

3. What are some possible causes of OBDII code P2720 in a 2018 GMC Sierra?

- Potential causes include a faulty pressure control solenoid, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

4. How can I diagnose the cause of OBDII code P2720 in my 2018 GMC Sierra?

- Diagnosis typically involves using a scan tool to check for the specific code, inspecting the transmission wiring and connectors, testing the pressure control solenoid, and ensuring proper transmission fluid levels.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P2720?

- It is not recommended to drive the vehicle with this code present, as it can lead to further transmission damage and potential safety issues.

6. How can I repair OBDII code P2720 in my 2018 GMC Sierra?

- Repair may involve replacing the pressure control solenoid, repairing damaged wiring or connectors, refilling transmission fluid, or reprogramming the transmission control module.

7. Will resetting the Check Engine light resolve OBDII code P2720 in my 2018 GMC Sierra?

- Simply clearing the code without addressing the underlying issue will not fix the problem. It is important to diagnose and repair the root cause of the code.

8. Is it possible to prevent OBDII code P2720 in a 2018 GMC Sierra?

- Regular maintenance, such as checking transmission fluid levels, inspecting wiring, and addressing any transmission issues promptly, can help prevent this code from occurring.

9. How much does it typically cost to repair OBDII code P2720 in a 2018 GMC Sierra?

- The cost of repair can vary depending on the specific cause of the code and the labor rates in your area. It is recommended to obtain quotes from reputable mechanics or dealerships.

10. Can a DIY enthusiast fix OBDII code P2720 in a 2018 GMC Sierra?

- While some aspects of the repair, such as checking wiring or connectors, may be tackled by DIY enthusiasts, diagnosing and replacing components like the pressure control solenoid may require specialized tools and expertise, making it advisable to consult a professional mechanic.