AutoCodes – GMC – P2721 2016 GMC Sierra

P2721 2016 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 2016 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.

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Code Popularity 195

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 P2721 2016 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 2016 GMC Sierra - Pressure Control Solenoid 4 Control Circuit High Voltage - AutoCodes.com — P2721 2016 GMC Sierra Code - Pressure Control Solenoid 4 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2721 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the P2721 2016 GMC Sierra code? Get Access to Factory Service Manuals

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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 P2721 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2721 in a 2016 GMC Sierra?

The common symptoms of OBDII code P2721, Pressure Control Solenoid 4 Control Circuit High Voltage, in a 2016 GMC Sierra may include harsh shifting, transmission slipping, and decreased fuel efficiency.

2. What are the possible causes of OBDII code P2721 in a 2016 GMC Sierra?

Possible causes of OBDII code P2721 in a 2016 GMC Sierra include a faulty pressure control solenoid 4, damaged wiring or connectors in the solenoid circuit, low transmission fluid level, or a malfunctioning transmission control module.

3. How can I diagnose the Pressure Control Solenoid 4 Control Circuit High Voltage issue in a 2016 GMC Sierra?

To diagnose the P2721 code in a 2016 GMC Sierra, you can use an OBDII scanner to read the trouble codes and perform a visual inspection of the pressure control solenoid 4 and its wiring. Testing the solenoid's resistance and checking transmission fluid level are also recommended diagnostic steps.

4. Can I continue driving my 2016 GMC Sierra with OBDII code P2721?

It is not advisable to continue driving your 2016 GMC Sierra with OBDII code P2721, as it can lead to further damage to the transmission system. It is recommended to address the issue promptly to prevent potential costly repairs.

5. How can I repair OBDII code P2721 in my 2016 GMC Sierra?

Repairing OBDII code P2721 in a 2016 GMC Sierra involves replacing the faulty pressure control solenoid 4, repairing any damaged wiring or connectors in the circuit, ensuring the transmission fluid is at the correct level, and resetting the trouble codes with an OBDII scanner.

6. Will resetting the trouble codes fix OBDII code P2721 in my 2016 GMC Sierra?

Simply resetting the trouble codes may temporarily clear the warning light associated with OBDII code P2721, but it will not fix the underlying issue causing the code. Proper diagnosis and repair of the problem are necessary to prevent the code from reoccurring.

7. How much does it cost to repair OBDII code P2721 in a 2016 GMC Sierra?

The cost of repairing OBDII code P2721 in a 2016 GMC Sierra can vary depending on the cause of the issue, the extent of the repairs needed, and the labor rates of the repair shop. It is recommended to obtain quotes from different mechanics to compare prices.

8. Are there any preventive measures to avoid OBDII code P2721 in a 2016 GMC Sierra?

To prevent OBDII code P2721 in a 2016 GMC Sierra, regular maintenance of the transmission system, such as checking and changing the transmission fluid at recommended intervals, can help prevent issues with the pressure control solenoid and related components.

9. Can a DIY enthusiast repair OBDII code P2721 in a 2016 GMC Sierra?

While some DIY enthusiasts may have the skills and tools to repair OBDII code P2721 in a 2016 GMC Sierra, it is a complex issue related to the transmission system. It is recommended to have a professional mechanic diagnose and repair the problem to ensure it is properly fixed.

10. How long does it take to repair OBDII code P2721 in a 2016 GMC Sierra?

The time it takes to repair OBDII code P2721 in a 2016 GMC Sierra can vary depending on the specific cause of the issue, the availability of parts, and the workload of the repair shop. In general, it may take a few hours to a day to complete the repairs.