AutoCodes – GMC – P2728 2018 GMC Sierra

P2728 2018 GMC Sierra Code - Pressure Control Solenoid Valve Performance

Quick Answer

The pressure control solenoid 5 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: P2728 2018 GMC Sierra indicates Pressure Control Solenoid Valve Performance.
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 164

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 P2728 2018 GMC Sierra Description

The pressure control solenoid 5 is part of the control solenoid valve assembly which has no serviceable parts. The normally low-pressure control solenoid 5 regulates and directs oil pressure to the 1-2-3-4 clutch regulator valve and 1-2-3-4 clutch boost valve. Increasing pressure control solenoid 5 pressure increases pressure to the 1-2-3-4 clutch. The Transmission Control Module varies the current to the pressure control solenoid 5 through a low-side driver. Increasing the current to pressure control solenoid 5 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to pressure control solenoid 5 decreases oil pressure by opening the exhaust port. Pressure control solenoid 5 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 internal electrical performance malfunction of the clutch pressure control solenoid valve 5 control circuit where the measured clutch pressure control solenoid valve 5 current does not equal the commanded clutch pressure control solenoid valve 5 current for 5 s.

OBDII Code P2728 2018 GMC Sierra - Pressure Control Solenoid Valve Performance - AutoCodes.com — P2728 2018 GMC Sierra Code - Pressure Control Solenoid Valve Performance

What does this mean?

What are the Possible Causes of the DTC P2728 2018 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 P2728 2018 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 P2728 2018 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 P2728 2018 GMC Sierra 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 P2728 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2728 in a 2018 GMC Sierra?

- Common symptoms include rough shifting, transmission slipping, decreased fuel efficiency, and an illuminated Check Engine light.

2. What can cause the OBDII code P2728 in a 2018 GMC Sierra?

- The code P2728 is typically triggered by issues with the pressure control solenoid valve, such as a faulty solenoid, low transmission fluid level, or a clogged transmission filter.

3. How serious is the OBDII code P2728 in a 2018 GMC Sierra?

- Ignoring the P2728 code can lead to further damage to the transmission system, potentially resulting in costly repairs if left unresolved.

4. Can I continue driving my 2018 GMC Sierra with the OBDII code P2728?

- It is not recommended to continue driving the vehicle with the P2728 code present, as it can cause further damage to the transmission.

5. How can I repair the OBDII code P2728 in my 2018 GMC Sierra?

- Repairing the P2728 code involves diagnosing the root cause of the issue with the pressure control solenoid valve and addressing any related problems, such as low fluid levels or clogged filters.

6. Is it possible to clear the OBDII code P2728 in a 2018 GMC Sierra without repairs?

- Clearing the code without addressing the underlying issue will only temporarily turn off the Check Engine light, but the problem will likely resurface.

7. Can a DIY enthusiast fix the OBDII code P2728 in a 2018 GMC Sierra?

- While some basic diagnostics can be done at home, resolving the P2728 code may require specialized tools and expertise, so it's recommended to consult a professional mechanic.

8. How much does it cost to repair the OBDII code P2728 in a 2018 GMC Sierra?

- The cost of repairing the P2728 code can vary depending on the exact cause of the issue, but it's advisable to budget for potential solenoid replacement or transmission fluid service.

9. Will the OBDII code P2728 cause my 2018 GMC Sierra to fail an emissions test?

- A vehicle with the P2728 code illuminated may fail an emissions test due to the impact on the transmission system's performance.

10. How long does it typically take to repair the OBDII code P2728 in a 2018 GMC Sierra?

- The repair time for the P2728 code can vary depending on the specific issue, but it's advisable to plan for a day or two for diagnostics and potential repairs.