The P0979 OBD-II code indicates an issue with the shift solenoid “C” control circuit, which is crucial for the proper functioning of the transmission in your vehicle.
What Does the P0979 Code Mean?
The P0979 code is triggered when the Transmission Control Module (TCM) detects that the shift solenoid “C” is not operating as it should. This solenoid plays a vital role in managing hydraulic pressure within the transmission, which in turn controls the application of various clutch packs necessary for shifting gears.
What Causes the P0979 Code?
Several factors can lead to the P0979 code being set:
- Failure of the Transmission Control Module (TCM)
- Low transmission fluid level
- Failure of the transmission shift solenoid
- Wiring issues affecting the solenoid circuit
What Are the Symptoms of the P0979 Code?
Drivers experiencing the P0979 code may notice the following symptoms:
- Transmission may not shift properly
- Increased fuel consumption due to improper transmission operation
How Serious Is the P0979 Code?
The P0979 code signifies an urgent issue that requires immediate attention. If left unaddressed, it can lead to significant damage to the transmission system, potentially resulting in costly repairs and unsafe driving conditions.
How to Diagnose the P0979 Code
To accurately diagnose the P0979 code, a mechanic will typically perform the following steps:
- Use an OBD-II scanner to confirm the presence of the P0979 code and check for any other related codes.
- Inspect the transmission fluid level and quality.
- Examine the wiring and connectors associated with the shift solenoid.
- Test the function of the TCM and the shift solenoid to determine if they are operating correctly.
Common Repairs for the P0979 Code
Depending on the diagnosis, the following repairs may be necessary:
- Replacing the shift solenoid “C” if it is found to be faulty
- Refilling or replacing low or contaminated transmission fluid
- Repairing or replacing damaged wiring and connectors
- Replacing the Transmission Control Module (TCM) if it is malfunctioning
How Much Does It Cost to Fix the P0979 Code?
The cost of repairs for the P0979 code can vary widely based on the specific issue and labor rates in your area. Typical costs can range from $150 to $1,000, depending on whether the shift solenoid, wiring, or TCM needs to be replaced.
Can I Fix the P0979 Code Myself?
While some DIY enthusiasts may be able to address simple issues like checking fluid levels or replacing a shift solenoid, diagnosing and repairing the P0979 code often requires specialized knowledge and tools. If you’re not confident in your ability to perform these repairs, it’s advisable to consult a professional mechanic.
