AutoCodes – Scion – P0974 Scion

P0974 Scion Code - Shift Solenoid 'A' Control Circuit High

Quick Answer

The Engine Control Module (ECM) commands gear shifts by turning the shift solenoid valves "ON/OFF". Common causes include Faulty Shift Solenoid 'A', Shift Solenoid 'A' harness is open or shorted, Shift Solenoid 'A' electrical circuit poor electrical connection. 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 Scion indicates Shift Solenoid 'A' Control Circuit High.
Common causes: Common causes include Faulty Shift Solenoid 'A', Shift Solenoid 'A' harness is open or shorted, Shift Solenoid 'A' electrical circuit poor electrical connection.
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 3,091

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0974 Scion Description

The Engine Control Module (ECM) commands gear shifts by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the engine light and stores the Diagnostic Trouble Code (DTC). And the ECM performs the fail-safe function and turns the other shift solenoids valves in good condition "ON/OFF".

OBDII Code P0974 Scion - Shift Solenoid 'A' Control Circuit High - AutoCodes.com — P0974 Scion Code - Shift Solenoid 'A' Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0974 Scion?

Faulty Shift Solenoid 'A'
Shift Solenoid 'A' harness is open or shorted
Shift Solenoid 'A' electrical circuit poor electrical connection

How to Fix the DTC P0974 Scion?

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 Scion 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.

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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 Scion Code

What does the OBDII code P0974 mean for a Scion?

P0974 indicates a high voltage issue in the shift solenoid 'A' control circuit, which is responsible for regulating transmission fluid flow to control gear shifts.

What are the common symptoms of code P0974 in a Scion?

Symptoms may include harsh or delayed shifting, inability to shift gears, transmission stuck in one gear, or the check engine light turning on.

What causes the P0974 code to appear in a Scion?

Possible causes include a faulty shift solenoid 'A', damaged wiring or connectors in the solenoid circuit, transmission fluid contamination, or a malfunctioning transmission control module (TCM).

Can driving with code P0974 damage my Scion?

Yes, driving with this code can cause further transmission damage or unsafe driving conditions, so it’s best to address the issue promptly.

How can I diagnose the P0974 code in my Scion?

Diagnosis involves checking the wiring and connectors for damage, testing the shift solenoid 'A' for proper function, and inspecting the transmission fluid for contamination.

Is replacing the shift solenoid 'A' always necessary to fix code P0974?

Not always. The issue could be due to damaged wiring, a loose connection, or a faulty TCM, so a thorough diagnosis is essential before replacing the solenoid.

Can low transmission fluid cause the P0974 code?

Low or contaminated transmission fluid can contribute to this issue as it affects the performance of the shift solenoid and transmission system.

How much does it cost to fix code P0974 in a Scion?

Repairs can range from $150 to $400 for replacing the solenoid, but costs may vary depending on the diagnosis and whether additional issues, like wiring damage, are found.

Can I fix the P0974 code on my Scion myself?

If you’re experienced with car repairs, you can inspect the wiring and solenoid, but professional diagnosis and repair are recommended for complex transmission issues.

Will clearing the code resolve the problem?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be fixed to prevent the code from returning.