AutoCodes – GMC – P2720 GMC

P2720 GMC 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 GMC 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 514

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

What does this mean?

What are the Possible Causes of the DTC P2720 GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the P2720 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P2720 2014 GMC Sierra — Pressure Control Solenoid 4 Control Circuit Low Voltage
P2720 2015 GMC Sierra — Pressure Control Solenoid 4 Control Circuit Low Voltage
P2720 2016 GMC Sierra — Pressure Control Solenoid 4 Control Circuit Low Voltage
P2720 2017 GMC Sierra — Pressure Control Solenoid 4 Control Circuit Low Voltage
P2720 2018 GMC Sierra — Pressure Control Solenoid 4 Control Circuit Low 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 P2720 GMC Code

What does the OBDII code P2720 mean for my GMC vehicle?

The OBDII code P2720 indicates a problem with the Pressure Control Solenoid 4 control circuit, specifically a low voltage issue affecting the transmission's ability to shift properly.

What are the common symptoms associated with the P2720 code?

Common symptoms include harsh or erratic shifting, slipping transmission, increased engine RPMs without corresponding vehicle speed, and potential warning lights on the dashboard.

What could cause the P2720 code to trigger?

Causes for the P2720 code may include a faulty pressure control solenoid, damaged wiring or connectors in the control circuit, low transmission fluid levels, or issues with the transmission control module (TCM).

How can I diagnose the P2720 code?

To diagnose the P2720 code, check the transmission fluid level and condition, inspect the wiring and connectors for damage, use a multimeter to test voltage at the solenoid, and consider scanning for additional trouble codes that may indicate related issues.

What repairs might be needed to resolve the P2720 code?

Repairs could involve replacing the pressure control solenoid, repairing or replacing damaged wiring or connectors, topping up or replacing low-quality transmission fluid, or in some cases, reprogramming or replacing the transmission control module.

Can I drive my vehicle with the P2720 code?

While it may be possible to drive with the P2720 code, it is not recommended, as it can lead to further transmission damage or failure. Itâ€™s best to address the issue as soon as possible.

How can I prevent the P2720 code from recurring in the future?

To prevent recurrence, ensure regular maintenance of the transmission, including fluid changes, and promptly address any warning signs of transmission issues. Additionally, keep an eye on the electrical connections for wear or corrosion.

Is the P2720 code serious?

Yes, the P2720 code can be serious as it affects the transmission's operation, potentially leading to significant performance issues and costly repairs if not addressed promptly.

Will clearing the P2720 code fix the problem?

Clearing the P2720 code may temporarily turn off the check engine light, but it wonâ€™t fix the underlying issue. The code will likely return if the root cause is not addressed.