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Engine-Codes – Generic – P0979

P0979 Code - Shift Solenoid 'C' Control Circuit Low

Quick Answer

The P0979 diagnostic trouble code indicates that there is an issue with the Shift Solenoid 'C' control circuit being detected as low. Common causes include Faulty shift solenoid 'C', Wiring or connector issues in the control circuit, Low transmission fluid levels. 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 indicates Shift Solenoid 'C' Control Circuit Low.
Common causes
Common causes include Faulty shift solenoid 'C', Wiring or connector issues in the control circuit, Low transmission fluid levels.
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 06, 2024
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Code P0979 Description

The P0979 diagnostic trouble code indicates that there is an issue with the Shift Solenoid 'C' control circuit being detected as low. The shift solenoid is responsible for controlling the flow of transmission fluid to engage the appropriate gear for smooth shifting. When the control circuit is reading as low, it means that there is a problem with the electrical signal being sent to the solenoid, which can lead to issues with shifting gears properly. This can result in harsh shifting, delayed shifting, or even the transmission getting stuck in a specific gear.

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

Common Causes of P0979

  1. Faulty shift solenoid 'C'
  2. Wiring or connector issues in the control circuit
  3. Low transmission fluid levels
  4. Internal transmission damage
  5. Faulty transmission control module

Symptoms of P0979

  1. Harsh or delayed shifting
  2. Transmission slipping
  3. Transmission getting stuck in a specific gear
  4. Decreased fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix P0979

  1. Begin by checking the transmission fluid level and condition. Top off or replace the fluid if necessary.
  2. Inspect the wiring and connectors in the shift solenoid 'C' control circuit for any signs of damage or corrosion. Repair or replace as needed.
  3. Test the shift solenoid 'C' for proper operation. Replace if it is found to be faulty.
  4. If the issue persists, have the transmission control module tested and potentially replaced.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0979

The cost of repairing a Shift Solenoid 'C' Control Circuit Low issue can vary depending on the root cause of the problem. Typically, the cost of replacing a shift solenoid can range from $150 to $400, including parts and labor. If the issue is related to wiring or the transmission control module, the cost may be higher. It's recommended to consult with a professional mechanic to get an accurate estimate based on your specific vehicle make and model. Labor rates can vary between $80 and $150 per hour, so it's advisable to inquire about local rates before proceeding with repairs.

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Code P0979 Information for Specific Makes

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.

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  • Lincoln mkt code p0979 I replaced transmission but still problem

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