AutoCodes – Chevrolet – P0974 2018 Chevrolet Silverado

P0974 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 314

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Shift Solenoid Valve 1 Control Circuit High Voltage - AutoCodes.com — P0974 2018 Chevrolet Silverado Code - Shift Solenoid Valve 1 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0974 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P0974 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What does OBDII code P0974 mean on a 2018 Chevrolet Silverado?

P0974 indicates a high voltage issue in the Shift Solenoid Valve 1 Control Circuit, which is responsible for controlling gear shifting in the transmission.

2. What are the common symptoms of a P0974 code in a 2018 Chevrolet Silverado?

Symptoms may include difficulty shifting gears, the transmission stuck in one gear, reduced fuel efficiency, and the check engine light turning on.

3. What causes the P0974 code to appear on a 2018 Chevrolet Silverado?

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

4. Can I drive my 2018 Chevrolet Silverado with a P0974 code?

Driving with a P0974 code is not recommended, as it can lead to further transmission damage and unsafe driving conditions due to shifting issues.

5. How is a P0974 code diagnosed on a 2018 Chevrolet Silverado?

A mechanic will use a scan tool to confirm the code, inspect the wiring and connectors for damage, and test the shift solenoid and related circuits for proper function.

6. How do I fix the P0974 code on my 2018 Chevrolet Silverado?

Repairs may include replacing the shift solenoid, repairing or replacing damaged wiring, cleaning or reconnecting loose connectors, or reprogramming the TCM if needed.

7. Is a faulty shift solenoid the only cause of a P0974 code in a 2018 Chevrolet Silverado?

No, other potential causes include corroded or loose electrical connections, short circuits, or a failing transmission control module.

8. How much does it cost to repair a P0974 code on a 2018 Chevrolet Silverado?

Repair costs vary but may range from $150 to $400 for parts and labor, depending on the exact issue, such as replacing a shift solenoid or repairing wiring.

9. Can I clear the P0974 code without fixing the issue on my 2018 Chevrolet Silverado?

You can clear the code temporarily with a scan tool, but the underlying issue will cause it to return unless properly resolved.

10. How can I prevent a P0974 code from occurring in my 2018 Chevrolet Silverado?

Regular maintenance, such as inspecting transmission wiring, keeping connectors clean, and addressing transmission issues promptly, can help prevent this code.