AutoCodes – Toyota – P0974 Toyota

P0974 Toyota 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 Toyota 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 20,447

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 May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0974 Toyota 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 Toyota - Shift Solenoid 'A' Control Circuit High - AutoCodes.com — P0974 Toyota Code - Shift Solenoid 'A' Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0974 Toyota?

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 Toyota?

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 Toyota 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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Need more information on how to fix the P0974 Toyota 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 Toyota Code

1. What are the common symptoms of OBDII code P0974 in a Toyota?

- Common symptoms include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission staying in limp mode.

2. What could cause the Shift Solenoid 'A' Control Circuit High code (P0974) in a Toyota?

- Possible causes include a faulty shift solenoid, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

3. How can I diagnose the Shift Solenoid 'A' Control Circuit High code in my Toyota?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the transmission fluid level and condition, inspecting the wiring and connectors, and testing the shift solenoid for proper operation.

4. Can I continue driving my Toyota with OBDII code P0974 present?

- It is not recommended to continue driving with this code as it can lead to further damage to the transmission. It is best to address the issue promptly.

5. How do I repair OBDII code P0974 in my Toyota?

- Repair options may include replacing the faulty shift solenoid, repairing damaged wiring or connectors, topping up transmission fluid, or reprogramming the transmission control module.

6. Will resetting the OBDII code P0974 in my Toyota make the issue go away permanently?

- Simply resetting the code may temporarily clear the warning light, but the underlying issue causing the code will likely persist until properly diagnosed and repaired.

7. Is it possible for a DIY enthusiast to fix OBDII code P0974 in a Toyota?

- While some aspects of diagnosing and repairing this code can be done by DIY enthusiasts, working on the transmission system can be complex and may require specialized tools and expertise.

8. How much does it typically cost to repair OBDII code P0974 in a Toyota?

- The cost of repairing this code can vary depending on the underlying issue, parts needed, labor costs, and whether the repair is done at a dealership or an independent mechanic. It's best to get a few quotes for an accurate estimate.

9. Can a mechanic clear the OBDII code P0974 without fixing the issue in my Toyota?

- Yes, a mechanic can clear the code, but if the underlying problem is not addressed, the code is likely to return, and the transmission issues may persist.

10. How can I prevent OBDII code P0974 from recurring in my Toyota?

- Regular maintenance, such as checking and changing transmission fluid as recommended, inspecting wiring for damage, and addressing any transmission-related issues promptly, can help prevent the recurrence of this code.