AutoCodes – GMC – P2729 2018 GMC Sierra

P2729 2018 GMC Sierra Code - Pressure Control Solenoid Valve 5 Control Circuit Low Voltage

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: P2729 2018 GMC Sierra indicates Pressure Control Solenoid Valve 5 Control Circuit Low 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 172

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 P2729 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 a short to ground on the clutch pressure control solenoid valve 5 control circuit for 1 s.

OBDII Code P2729 2018 GMC Sierra - Pressure Control Solenoid Valve 5 Control Circuit Low Voltage - AutoCodes.com — P2729 2018 GMC Sierra Code - Pressure Control Solenoid Valve 5 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2729 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 P2729 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 P2729 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 P2729 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 P2729 2018 GMC Sierra Code

1. What does OBDII code P2729 mean for my 2018 GMC Sierra?

- This code indicates a problem with Pressure Control Solenoid Valve 5 Control Circuit Low Voltage in your vehicle's transmission system.

2. What are the common symptoms of OBDII code P2729 in a 2018 GMC Sierra?

- Common symptoms may include harsh shifting, transmission slippage, poor acceleration, and the illumination of the Check Engine Light.

3. What are the possible causes of OBDII code P2729 in a 2018 GMC Sierra?

- The code P2729 can be triggered by issues such as a faulty pressure control solenoid, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

4. How can I diagnose the cause of OBDII code P2729 in my 2018 GMC Sierra?

- Proper diagnosis involves using a scan tool to retrieve the code, inspecting the transmission fluid level and condition, checking the wiring and connections related to the pressure control solenoid, and testing the solenoid itself.

5. Can I still drive my 2018 GMC Sierra with OBDII code P2729 present?

- It is not recommended to continue driving your vehicle with this code active, as it can lead to further damage to the transmission system. It's best to address the issue promptly.

6. How do I repair OBDII code P2729 in my 2018 GMC Sierra?

- Repairs may involve replacing the pressure control solenoid, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, or addressing any issues with the transmission control module.

7. Is it possible to clear OBDII code P2729 in a 2018 GMC Sierra without fixing the underlying issue?

- While clearing the code may temporarily turn off the Check Engine Light, the underlying problem causing the code will persist, leading to potential transmission issues. It's best to address the root cause of the code.

8. How much does it cost to fix OBDII code P2729 in a 2018 GMC Sierra?

- The cost of repairs for this code can vary depending on the specific cause of the issue, parts needed, and labor costs. It's advisable to consult a professional mechanic for an accurate estimate.

9. Can OBDII code P2729 in a 2018 GMC Sierra cause further damage if left untreated?

- Yes, ignoring this code can potentially lead to more severe transmission problems, increased repair costs, and even vehicle drivability issues. It is important to address the underlying cause promptly.

10. Is it possible to prevent OBDII code P2729 from occurring in my 2018 GMC Sierra?

- Regular maintenance, including checking transmission fluid levels, addressing any issues with the transmission promptly, and following the manufacturer's recommended service intervals can help prevent this code from appearing.