AutoCodes – GMC – P2728 GMC

P2728 GMC 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 GMC 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 503

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

What does this mean?

What are the Possible Causes of the DTC P2728 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 P2728 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 P2728 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 P2728 GMC code?

Need more information on how to fix the P2728 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P2728 2014 GMC Sierra — Pressure Control Solenoid Valve Performance
P2728 2015 GMC Sierra — Pressure Control Solenoid Valve Performance
P2728 2016 GMC Sierra — Pressure Control Solenoid Valve Performance
P2728 2017 GMC Sierra — Pressure Control Solenoid Valve Performance
P2728 2018 GMC Sierra — Pressure Control Solenoid Valve Performance

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 GMC Code

1. What are common symptoms of OBDII code P2728 in a GMC vehicle?

- Common symptoms include harsh shifting, transmission slipping, poor fuel economy, and the transmission going into limp mode.

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

- The code P2728 is typically triggered by a malfunctioning pressure control solenoid valve, low transmission fluid levels, dirty transmission fluid, or a faulty transmission control module.

3. How serious is OBDII code P2728 in a GMC vehicle?

- OBDII code P2728 should be addressed promptly as it can lead to further damage to the transmission if left unchecked.

4. Can I continue driving my GMC vehicle with OBDII code P2728?

- It is not recommended to drive the vehicle with code P2728 as it can result in further transmission issues and potential safety hazards.

5. How can I repair OBDII code P2728 in my GMC vehicle?

- Repairing code P2728 involves diagnosing the root cause, which may involve replacing the pressure control solenoid valve, checking and refilling transmission fluid, or addressing any other related issues.

6. Can a DIY enthusiast fix OBDII code P2728 in a GMC vehicle?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing code P2728 may require specialized tools and expertise best left to a professional mechanic.

7. How much does it cost to repair OBDII code P2728 in a GMC vehicle?

- The cost of repairing code P2728 can vary depending on the root cause of the issue, the labor rates in your area, and the cost of parts. It is recommended to obtain quotes from different mechanics.

8. How can I prevent OBDII code P2728 from occurring in my GMC vehicle?

- Regular maintenance of the transmission system, including checking and changing the transmission fluid at recommended intervals, can help prevent code P2728 from occurring.

9. Will resetting the OBDII code P2728 in my GMC vehicle make it go away permanently?

- Resetting the code may temporarily clear the error code, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven again.

10. Is it safe to clear the OBDII code P2728 using an OBDII scanner without fixing the issue?

- It is not recommended to clear the code without addressing the underlying problem, as this may lead to further damage to the vehicle's transmission system.