AutoCodes – Ford – P0979 Ford

P0979 Ford Code - Shift Solenoid 'C' Control Circuit Low

Quick Answer

The Engine Control Module (ECM) commands gear shifts by turning the shift solenoid valves "ON/OFF". Common causes include Faulty Shift Solenoid 'C', Shift Solenoid 'C' harness is open or shorted, Shift Solenoid 'C' 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: P0979 Ford indicates Shift Solenoid 'C' Control Circuit Low.
Common causes: Common causes include Faulty Shift Solenoid 'C', Shift Solenoid 'C' harness is open or shorted, Shift Solenoid 'C' 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 7,296

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 P0979 Ford 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 P0979 Ford - Shift Solenoid 'C' Control Circuit Low - AutoCodes.com — P0979 Ford Code - Shift Solenoid 'C' Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0979 Ford?

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

How to Fix the DTC P0979 Ford?

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 P0979 Ford 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 P0979 Ford Code

1. What are the common symptoms of OBDII code P0979 in a Ford vehicle?

- Common symptoms include harsh or delayed shifting, transmission slipping, and illuminated Check Engine Light.

2. What does the OBDII code P0979 Shift Solenoid 'C' Control Circuit Low mean for a Ford vehicle?

- The code indicates that there is a low voltage condition in the control circuit of shift solenoid 'C' in the transmission.

3. What are the possible causes of the P0979 code in a Ford vehicle?

- Potential causes include a faulty shift solenoid 'C', damaged wiring or connectors in the solenoid circuit, low transmission fluid level, or a malfunctioning transmission control module.

4. How can I diagnose the P0979 code in my Ford vehicle?

- Diagnosing involves checking the transmission fluid level, inspecting the wiring and connectors for damage, testing the shift solenoid 'C' for proper operation, and scanning the vehicle's computer for related trouble codes.

5. Can I continue driving my Ford with the P0979 code present?

- It is not recommended to continue driving with the P0979 code as it can lead to further transmission damage and potential safety hazards. It's best to address the issue promptly.

6. How can I repair the Shift Solenoid 'C' Control Circuit Low issue in my Ford vehicle?

- Repair steps may include replacing the faulty shift solenoid 'C', repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and resetting the trouble codes.

7. Is it possible to clear the P0979 code in a Ford vehicle without fixing the underlying issue?

- Clearing the code without addressing the root cause is not recommended, as the problem will likely persist and trigger the Check Engine Light again. It's best to fix the issue first.

8. How much does it typically cost to repair the P0979 code in a Ford vehicle?

- The cost of repairs can vary depending on the exact cause of the issue, but it may range from $200 to $600, including parts and labor.

9. Can I fix the P0979 code in my Ford vehicle myself, or do I need a professional mechanic?

- Depending on your skill level and access to tools, you may be able to address the issue yourself by following repair guides or consulting with professional help for more complex repairs.

10. How long does it usually take to repair the P0979 code in a Ford vehicle?

- The repair time can vary based on the specific cause of the issue and your experience level. Simple fixes like checking the fluid level may take minutes, while replacing a shift solenoid could take a few hours.