AutoCodes – GMC – P2729 2015 GMC Sierra

P2729 2015 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 2015 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 148

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 2015 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 2015 GMC Sierra - Pressure Control Solenoid Valve 5 Control Circuit Low Voltage - AutoCodes.com — P2729 2015 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 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P2729 mean on a 2015 GMC Sierra?

Code P2729 indicates a "Pressure Control Solenoid Valve 5 Control Circuit Low Voltage," meaning the transmission control module (TCM) has detected a low voltage issue in the circuit controlling solenoid 5.

2. What are the common symptoms of code P2729 in a 2015 GMC Sierra?

Common symptoms include harsh or delayed shifting, transmission slipping, reduced fuel efficiency, the check engine light turning on, or the vehicle entering limp mode.

3. What causes the P2729 code on a GMC Sierra?

Causes may include a faulty pressure control solenoid, damaged wiring or connectors in the solenoid circuit, low transmission fluid, a malfunctioning TCM, or internal transmission issues.

4. Can low transmission fluid cause the P2729 code?

Yes, low or contaminated transmission fluid can cause improper solenoid operation and lead to the P2729 code.

5. How do I diagnose the P2729 code on my 2015 GMC Sierra?

Diagnosis involves checking the transmission fluid level and condition, inspecting the wiring and connectors for damage or corrosion, testing the solenoid's resistance, and verifying proper voltage and ground signals to the solenoid.

6. Can I drive my GMC Sierra with the P2729 code?

Driving with this code is not recommended as it may lead to further transmission damage and unsafe driving conditions due to shifting issues.

7. How do I fix the P2729 code on a 2015 GMC Sierra?

Repairs may include replacing the faulty pressure control solenoid, repairing damaged wiring or connectors, topping off or replacing the transmission fluid, or reprogramming or replacing the TCM if needed.

8. How much does it cost to repair the P2729 code on a GMC Sierra?

Repair costs vary depending on the issue but can range from $150 for wiring repairs to $500â€“$1,500 for solenoid or TCM replacement, plus labor.

9. Can a bad TCM cause the P2729 code?

Yes, a malfunctioning transmission control module can cause low voltage in the solenoid circuit, triggering the P2729 code.

10. How can I prevent the P2729 code from occurring?

Regular transmission maintenance, including fluid checks and changes, inspecting wiring for wear, and addressing transmission issues promptly, can help prevent the P2729 code.