AutoCodes – GMC – P0974 2014 GMC Sierra

P0974 2014 GMC Sierra Code - Shift Solenoid Valve 1 Control Circuit High Voltage

Quick Answer

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. 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: P0974 2014 GMC Sierra indicates Shift Solenoid Valve 1 Control Circuit High 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.

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Code Popularity 270

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 P0974 2014 GMC Sierra Description

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. The shift solenoid 1 is a normally closed ON/OFF solenoid and is controlled by the Transmission Control Module through a low side driver. When the shift solenoid 1 is energized, shift solenoid 1 fluid pressure is directed to the clutch select valve 2. Power to the shift solenoid 1 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 control solenoid valve assembly detects an internal high voltage electrical malfunction of the shift solenoid 1 control circuit when the shift solenoid 1 is commanded ON for 2 seconds.

OBDII Code P0974 2014 GMC Sierra - Shift Solenoid Valve 1 Control Circuit High Voltage - AutoCodes.com — P0974 2014 GMC Sierra Code - Shift Solenoid Valve 1 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0974 2014 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

How to Fix the DTC P0974 2014 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 P0974 2014 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 P0974 2014 GMC Sierra code?

Need more information on how to fix the P0974 2014 GMC Sierra code? Get Access to Factory Service Manuals

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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 P0974 2014 GMC Sierra Code

What are the common symptoms of OBDII code P0974 in a 2014 GMC Sierra?

Common symptoms include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission going into limp mode.

What are the possible causes of OBDII code P0974 in a 2014 GMC Sierra?

Possible causes include a faulty shift solenoid valve 1, damaged wiring or connectors in the shift solenoid circuit, low transmission fluid level, or a malfunctioning transmission control module.

How can I diagnose OBDII code P0974 in a 2014 GMC Sierra?

Diagnosis typically involves using a scan tool to check for the specific trouble code, inspecting the shift solenoid valve 1 and its wiring for any damage, and testing the transmission fluid level and quality.

What are some repair tips for fixing OBDII code P0974 in a 2014 GMC Sierra?

Repair tips may include replacing the shift solenoid valve 1 if it is found to be faulty, repairing any damaged wiring or connectors in the circuit, ensuring the transmission fluid level is correct, and resetting the trouble codes after repairs are completed.

Is it safe to continue driving a 2014 GMC Sierra with OBDII code P0974?

It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission. It is best to diagnose and repair the issue as soon as possible.

Can I fix OBDII code P0974 in a 2014 GMC Sierra by simply clearing the code?

Clearing the trouble code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the code. It is important to diagnose and repair the problem to prevent further issues.

How much does it typically cost to repair OBDII code P0974 in a 2014 GMC Sierra?

The cost of repairs can vary depending on the specific cause of the code and the labor rates in your area. It is recommended to get a diagnostic from a qualified mechanic to determine the exact cost.

Are there any recalls or technical service bulletins related to OBDII code P0974 in a 2014 GMC Sierra?

It is advisable to check with your local GMC dealership or online resources for any recalls or technical service bulletins related to this specific OBDII code in your vehicle.

What should I do if OBDII code P0974 keeps coming back in my 2014 GMC Sierra after repairs?

If the code keeps coming back after repairs, it may indicate that the underlying issue has not been fully resolved. It is recommended to recheck the repairs, ensure proper installation of components, and consider seeking further diagnosis from a professional mechanic.