AutoCodes – GMC – P2738 2017 GMC Sierra

P2738 2017 GMC Sierra Code - Transmission Control Solenoid Valve 6 Control Circuit Low Voltage

Quick Answer

The Transmission Control Solenoid Valve Solenoid Valve is an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve. 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: P2738 2017 GMC Sierra indicates Transmission Control Solenoid Valve 6 Control Circuit Low Voltage.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 234

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2738 2017 GMC Sierra Description

The Transmission Control Solenoid Valve Solenoid Valve is an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. As current flow is increased, the magnetic field produced by the coil moves the solenoid’s plunger further away from the exhaust port. Opening the exhaust port decreases the output fluid pressure regulated by the Transmission Control Solenoid Valve, which ultimately decreases line pressure. The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM). The Diagnostic Trouble Code (DTC) is set when the Transmission Control Solenoid Valve Control Circuit commanded state does not match the actual state for greater than 1 s.

OBDII Code P2738 2017 GMC Sierra - Transmission Control Solenoid Valve 6 Control Circuit Low Voltage - AutoCodes.com — P2738 2017 GMC Sierra Code - Transmission Control Solenoid Valve 6 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2738 2017 GMC Sierra?

Low transmission fluid level
Dirty transmission fluid
Faulty Transmission Control Solenoid Valve
Transmission Control Solenoid Valve harness is open or shorted
Transmission Control Solenoid Valve circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P2738 2017 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 P2738 2017 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 P2738 2017 GMC Sierra code?

Need more information on how to fix the P2738 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2738 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P2738 2017 GMC Sierra Code

1. What does the OBDII code P2738 mean on a 2017 GMC Sierra?

P2738 indicates a low voltage issue in the control circuit for Transmission Control Solenoid Valve 6, which helps regulate transmission fluid flow for proper gear shifting.

2. What are the common symptoms of a P2738 code?

Symptoms may include harsh or delayed shifting, transmission slipping, poor fuel efficiency, or the Check Engine Light being illuminated.

3. What causes the P2738 code on a GMC Sierra?

Common causes include a faulty transmission control solenoid, damaged wiring, corroded electrical connections, low transmission fluid levels, or a failing transmission control module (TCM).

4. Can I still drive my 2017 GMC Sierra with a P2738 code?

You may be able to drive the vehicle, but it is not recommended as it can lead to further transmission damage and unsafe driving conditions.

5. How is the P2738 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the wiring and connections for damage, test the solenoid's resistance, and check the transmission fluid level and quality.

6. How can I fix the P2738 code on my GMC Sierra?

Repairs may involve replacing the faulty solenoid, repairing or replacing damaged wiring, cleaning corroded connections, or updating/replacing the TCM if needed.

7. Could low transmission fluid cause the P2738 code?

Yes, low or contaminated transmission fluid can cause pressure issues that affect the solenoid's operation and trigger the code.

8. How much does it cost to repair a P2738 code?

Repair costs vary but could range from $150 to $400 for solenoid replacement and wiring repairs. If the TCM needs replacement, costs may exceed $1,000.

9. Can a bad battery cause the P2738 code?

A weak or failing battery can cause voltage drops, potentially affecting the solenoid circuit and triggering the code.

10. How can I prevent the P2738 code from recurring?

Regularly maintain your transmission by checking fluid levels, addressing wiring issues promptly, and ensuring the TCM and electrical system are functioning properly.