AutoCodes – GMC – P2721 2017 GMC Sierra

P2721 2017 GMC Sierra Code - Pressure Control Solenoid 4 Control Circuit High 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: P2721 2017 GMC Sierra indicates Pressure Control Solenoid 4 Control Circuit High 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.

Save to My Repairs My Repairs

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

Code Popularity 236

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 P2721 2017 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 an open or short to voltage on the pressure control solenoid 4 control circuit for 1 s.

OBDII Code P2721 2017 GMC Sierra - Pressure Control Solenoid 4 Control Circuit High Voltage - AutoCodes.com — P2721 2017 GMC Sierra Code - Pressure Control Solenoid 4 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2721 2017 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 P2721 2017 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 P2721 2017 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 P2721 2017 GMC Sierra code?

Need more information on how to fix the P2721 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2721 2017 GMC Sierra 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 P2721 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P2721 in a 2017 GMC Sierra related to Pressure Control Solenoid 4 Control Circuit High Voltage?

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

2. What are the possible causes of OBDII code P2721 in a 2017 GMC Sierra?

- Potential causes may include a faulty pressure control solenoid, damaged wiring or connectors in the solenoid circuit, low transmission fluid levels, or internal transmission issues.

3. How can I diagnose the Pressure Control Solenoid 4 Control Circuit High Voltage issue in my 2017 GMC Sierra?

- Diagnosis involves using an OBDII scanner to retrieve the trouble code, inspecting the transmission fluid level and condition, and performing a thorough visual inspection of the solenoid and its circuitry.

4. Is it safe to continue driving my 2017 GMC Sierra with OBDII code P2721 active?

- It is not recommended to continue driving with this code active, as it can lead to further damage to the transmission and potentially result in costly repairs.

5. Can I reset the OBDII code P2721 in my 2017 GMC Sierra without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the problem to prevent it from reoccurring and causing potential transmission damage.

6. How much does it typically cost to repair OBDII code P2721 in a 2017 GMC Sierra?

- The cost of repair can vary depending on the extent of the issue, but it may involve replacing the pressure control solenoid, repairing damaged wiring, or addressing other transmission-related issues.

7. Are there any DIY repair tips for fixing OBDII code P2721 in a 2017 GMC Sierra?

- DIY repair may involve checking and replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and cleaning or replacing the pressure control solenoid if necessary.

8. Can a mechanic easily fix OBDII code P2721 in a 2017 GMC Sierra?

- A qualified mechanic should be able to diagnose and repair the issue efficiently, especially if they have experience working on GMC Sierra transmissions.

9. How long does it typically take to repair OBDII code P2721 in a 2017 GMC Sierra?

- The repair time can vary based on the specific cause of the code, but it may take anywhere from a few hours to a full day, depending on the complexity of the repair needed.

10. Is OBDII code P2721 a common issue in 2017 GMC Sierra vehicles?

- While it may not be the most common issue, occurrences of this code can happen due to various factors affecting the pressure control solenoid and its circuitry.