AutoCodes – Chevrolet – P2721 2018 Chevrolet Silverado

P2721 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 753

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Pressure Control Solenoid 4 Control Circuit High Voltage - AutoCodes.com — P2721 2018 Chevrolet Silverado Code - Pressure Control Solenoid 4 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2721 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 P2721 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P2721 on a 2018 Chevrolet Silverado?

- Common symptoms include harsh shifting, transmission slipping, poor fuel efficiency, and an illuminated Check Engine Light.

2. What could cause the Pressure Control Solenoid 4 Control Circuit High Voltage code (P2721) on a 2018 Chevrolet Silverado?

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

3. How do I diagnose the Pressure Control Solenoid 4 Control Circuit High Voltage code on my 2018 Chevrolet Silverado?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the transmission wiring and connectors, testing the pressure control solenoid, and checking the transmission fluid level and condition.

4. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P2721 present?

- It is recommended to address the issue promptly to prevent potential transmission damage. Continued driving with the code present may lead to further transmission problems.

5. What are the repair options for fixing OBDII code P2721 on a 2018 Chevrolet Silverado?

- Repair options may include replacing the pressure control solenoid, repairing or replacing damaged wiring, ensuring proper transmission fluid levels, and addressing any internal transmission issues.

6. How much does it typically cost to repair OBDII code P2721 on a 2018 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the code. Repairs may range from a few hundred dollars for simple fixes like wiring repairs to over a thousand dollars for more complex transmission repairs.

7. Can a DIY enthusiast fix OBDII code P2721 on a 2018 Chevrolet Silverado?

- While some DIY enthusiasts may have the skills to address simpler causes like wiring issues, diagnosing and repairing transmission-related problems may require specialized tools and expertise best left to professional mechanics.

8. How long does it take to repair OBDII code P2721 on a 2018 Chevrolet Silverado?

- The repair time can vary based on the specific cause of the code and the complexity of the fix. Simple repairs may be completed in a few hours, while more involved transmission repairs could take a day or more.

9. Are there any preventive measures to avoid OBDII code P2721 on a 2018 Chevrolet Silverado?

- Regular maintenance, such as checking and changing transmission fluid at recommended intervals, can help prevent issues that may trigger the P2721 code. Additionally, addressing any transmission-related symptoms promptly can prevent further damage.

10. Can resetting the Check Engine Light clear OBDII code P2721 on a 2018 Chevrolet Silverado?

- While resetting the Check Engine Light may temporarily turn it off, it will not fix the underlying issue causing the P2721 code. It is essential to diagnose and address the root cause of the problem to prevent further issues.