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P0974 2018 Chevrolet Silverado Code - Shift Solenoid Valve 1 Control Circuit High Voltage

Quick Answer

The P0974 code in a 2018 Chevrolet Silverado indicates a problem with the Shift Solenoid Valve 1 Control Circuit, specifically detecting high voltage. Common causes include Faulty shift solenoid valve, Damaged wiring or connectors in the control circuit, Malfunctioning transmission control module (TCM). 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 Faulty shift solenoid valve, Damaged wiring or connectors in the control circuit, Malfunctioning transmission control module (TCM).
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 13, 2024
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Code P0974 2018 Chevrolet Silverado Description

The P0974 code in a 2018 Chevrolet Silverado indicates a problem with the Shift Solenoid Valve 1 Control Circuit, specifically detecting high voltage. The shift solenoid valve is a crucial component of the transmission system responsible for controlling the flow of transmission fluid to engage the appropriate gear. When the control circuit registers high voltage, it means that there is an electrical issue affecting the solenoid's operation.

OBDII Code P0974 2018 Chevrolet Silverado - Shift Solenoid Valve 1 Control Circuit High Voltage
P0974 2018 Chevrolet Silverado Code - Shift Solenoid Valve 1 Control Circuit High Voltage

Common Causes of P0974 2018 Chevrolet Silverado

  1. Faulty shift solenoid valve
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning transmission control module (TCM)
  4. Low transmission fluid level
  5. Electrical issues such as a short circuit or corrosion in the wiring

Symptoms of P0974 2018 Chevrolet Silverado

  1. Erratic shifting
  2. Transmission slipping
  3. Harsh shifting
  4. Transmission getting stuck in a single gear
  5. Illumination of the Check Engine Light

How to Fix P0974 2018 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the shift solenoid valve, wiring, and connectors to identify any visible damage or issues.
  2. Test the shift solenoid valve and control circuit using a multimeter to check for proper voltage and continuity.
  3. If the shift solenoid valve is faulty, replace it with a new one following the manufacturer's guidelines.
  4. Repair or replace any damaged wiring or connectors in the control circuit.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0974 2018 Chevrolet Silverado

The typical repair costs for addressing a P0974 code in a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. Generally, replacing a shift solenoid valve can range from $150 to $300, while addressing wiring or connector issues may cost between $100 and $200. Labor costs can add an additional $80 to $150 per hour, and the total repair bill could amount to $300 to $600 or more. It's advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs and location.

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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.

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