AutoCodes – Buick – P2720 Buick

P2720 Buick 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 Buick 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 575

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 Buick 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 Buick - Pressure Control Solenoid 4 Control Circuit Low Voltage - AutoCodes.com — P2720 Buick Code - Pressure Control Solenoid 4 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2720 Buick?

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 Buick?

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 Buick 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.

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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 Buick Code

1. What are common symptoms of OBDII code P2720 in a Buick related to Pressure Control Solenoid 4?

- Common symptoms include harsh shifting, delayed shifting, transmission slipping, and decreased fuel efficiency.

2. What are the potential causes of OBDII code P2720 in a Buick?

- The code may be triggered by issues such as a faulty pressure control solenoid, wiring or connector problems, low transmission fluid, or internal transmission issues.

3. How can I diagnose the cause of OBDII code P2720 in my Buick?

- To diagnose the issue, you can start by checking the transmission fluid level and condition, inspecting the wiring and connectors related to the pressure control solenoid, and using a scan tool to monitor transmission data.

4. Can I continue driving my Buick with OBDII code P2720 present?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission and potentially leave you stranded.

5. How can I repair OBDII code P2720 in my Buick at home?

- Repairing this code may involve replacing the pressure control solenoid, repairing any damaged wiring or connectors, and ensuring the transmission fluid is at the correct level and condition.

6. Will resetting the OBDII code P2720 in my Buick make it go away permanently?

- Simply resetting the code may not fix the underlying issue causing P2720. It is important to diagnose and address the root cause of the problem to prevent the code from reappearing.

7. How much does it typically cost to repair OBDII code P2720 in a Buick at a professional mechanic or dealership?

- The cost of repairing this code can vary depending on the specific cause, but it may range from $200 to $800 or more, including parts and labor.

8. Can a faulty pressure control solenoid cause other transmission-related issues in my Buick besides triggering OBDII code P2720?

- Yes, a faulty pressure control solenoid can cause a range of transmission issues such as erratic shifting, harsh engagement, and transmission slippage.

9. Is it possible for DIY enthusiasts to replace the pressure control solenoid to address OBDII code P2720 in a Buick?

- Yes, replacing the pressure control solenoid is a repair that some DIY enthusiasts may be able to tackle with the right tools, knowledge, and precautions.

10. How can regular maintenance help prevent OBDII code P2720 from occurring in my Buick?

- Regularly checking and maintaining your transmission fluid, addressing any leaks promptly, and following the manufacturer's recommended maintenance schedule can help prevent issues that trigger this code.