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P2739 2018 GMC Sierra Code - Transmission Control Solenoid Valve 6 Control Circuit High Voltage

Quick Answer

The P2739 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Transmission Control Solenoid Valve 6 Control Circuit High Voltage. Common causes include Faulty transmission control solenoid valve, Damaged wiring or connectors in the circuit, Malfunctioning transmission control module. 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
P2739 2018 GMC Sierra indicates Transmission Control Solenoid Valve 6 Control Circuit High Voltage.
Common causes
Common causes include Faulty transmission control solenoid valve, Damaged wiring or connectors in the circuit, Malfunctioning transmission control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P2739 2018 GMC Sierra Description

The P2739 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Transmission Control Solenoid Valve 6 Control Circuit High Voltage. This code indicates that there is a problem with the electrical circuit that controls the transmission solenoid valve number 6, causing it to have a higher voltage than normal. The transmission control solenoid valves play a crucial role in regulating the flow of transmission fluid within the transmission system, which is essential for smooth gear shifting and overall transmission performance.

OBDII Code P2739 2018 GMC Sierra - Transmission Control Solenoid Valve 6 Control Circuit High Voltage
P2739 2018 GMC Sierra Code - Transmission Control Solenoid Valve 6 Control Circuit High Voltage

Common Causes of P2739 2018 GMC Sierra

  1. Faulty transmission control solenoid valve
  2. Damaged wiring or connectors in the circuit
  3. Malfunctioning transmission control module
  4. Issues with the vehicle's battery or charging system

Symptoms of P2739 2018 GMC Sierra

  1. Erratic or harsh shifting
  2. Transmission slipping or getting stuck in a gear
  3. Poor acceleration
  4. Reduced fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix P2739 2018 GMC Sierra

  1. Begin by conducting a thorough diagnostic scan to confirm the P2739 code and identify the specific issue with the Transmission Control Solenoid Valve 6 Control Circuit.
  2. Inspect the wiring and connectors associated with the solenoid valve circuit for any damage or corrosion. Repair or replace any damaged components as needed.
  3. Test the transmission control solenoid valve number 6 to ensure it is functioning correctly. Replace the solenoid valve if it is found to be faulty.
  4. Check the transmission control module for any signs of malfunction. If necessary, reprogram or replace the module to resolve the high voltage issue.
  5. Clear the DTC and perform a test drive to verify that the transmission is shifting smoothly and the issue has been successfully resolved.

Cost to Fix P2739 2018 GMC Sierra

The typical repair costs for addressing a P2739 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a transmission control solenoid valve can range from $150 to $300, while addressing wiring or connector issues may cost between $100 and $200. If the transmission control module needs to be replaced, the cost can be higher, typically ranging from $500 to $1000. Labor costs at auto repair shops can vary between $80 and $150 per hour, so it's advisable to check local rates for a more accurate estimate.

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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 P2739 2018 GMC Sierra Code

1. What does the OBDII code P2739 mean on a 2018 GMC Sierra?

P2739 indicates a high voltage issue in the Transmission Control Solenoid Valve 6 control circuit, which may affect the transmission's ability to shift properly.

2. What are the common symptoms of a P2739 code in a GMC Sierra?

Symptoms may include harsh or delayed shifting, transmission stuck in one gear, decreased fuel efficiency, or illumination of the check engine light.

3. What causes the P2739 code to appear?

Common causes include a faulty solenoid valve, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or an electrical short in the solenoid circuit.

4. Can I drive my 2018 GMC Sierra with a P2739 code?

It is not recommended to drive with this code for an extended period, as it can lead to further transmission damage and unsafe driving conditions.

5. How do I diagnose the P2739 code in a GMC Sierra?

Diagnosis may involve using a scan tool to check for related codes, inspecting the solenoid valve wiring and connectors, and testing the solenoid circuit for proper voltage and resistance.

6. How can I fix the P2739 code on my GMC Sierra?

Repairs may include replacing the faulty solenoid valve, repairing or replacing damaged wiring, or reprogramming or replacing the TCM if necessary.

7. What tools are needed to repair a P2739 code?

Tools may include an OBDII scan tool, multimeter, wiring diagram, and basic hand tools for accessing the transmission components.

8. How much does it cost to fix a P2739 code on a 2018 GMC Sierra?

Repair costs vary but can range from $150 to $500 depending on whether the issue is with wiring, the solenoid itself, or the TCM.

9. Can a low transmission fluid level cause the P2739 code?

While low fluid levels don’t directly cause this code, they can lead to overheating or mechanical issues that may indirectly affect solenoid performance.

10. Does the P2739 code require reprogramming the TCM?

In some cases, reprogramming or updating the transmission control module may be necessary if the issue is related to a software glitch.

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