The P0968 trouble code is a diagnostic trouble code (DTC) that indicates an issue with the Pressure Control Solenoid “C” control circuit in an automatic transmission. This code is triggered when the Powertrain Control Module (PCM) detects an open circuit or malfunction in the solenoid’s control circuit, which is crucial for regulating hydraulic pressure within the transmission. A malfunctioning solenoid can lead to various transmission issues, including erratic shifting, overheating, and potential damage to the transmission system itself.
P0968 Code Meaning | P0968 Code Common Causes |
---|---|
Pressure Control Solenoid “C” Control Circuit/Open | Defective pressure control solenoid |
Transmission fluid pressure regulation failure | Contaminated or low transmission fluid |
Transmission shifting problems | Damaged wiring or connectors |
Potential transmission overheating | Faulty transmission pump |
Check Engine Light activation | Blocked hydraulic passages |
Limp mode activation by PCM | Faulty PCM or TCM (Transmission Control Module) |
Symptoms of P0968 Trouble Code
When the P0968 code is triggered, vehicle owners may experience a range of symptoms that indicate a problem with their transmission system. These symptoms can vary in severity but often include:
- Increased fuel consumption: The vehicle may consume more fuel than usual due to inefficient shifting.
- Check Engine Light illuminated: The PCM will trigger the Check Engine Light as a warning of the detected issue.
- Transmission overheating: The transmission may run hotter than normal, potentially leading to further damage.
- Harsh or erratic shifting: Drivers may notice that the transmission shifts hard or slips during gear changes.
- Limp mode activation: The PCM may limit vehicle performance to prevent further damage, resulting in reduced power and speed.
- Misfire-like symptoms: The vehicle may exhibit symptoms similar to engine misfires due to improper gear engagement.
Technical Explanation of P0968
The P0968 trouble code is associated with the electronic control of the automatic transmission’s hydraulic system. The Pressure Control Solenoid “C” is responsible for regulating fluid pressure within the transmission, which is essential for smooth gear shifts. When the PCM detects an open circuit in this solenoid’s control line, it triggers the P0968 code.
Function of Pressure Control Solenoids
Automatic transmissions typically utilize multiple pressure control solenoids (A, B, C, etc.) to manage fluid pressure effectively. These solenoids receive signals from the PCM based on various inputs such as throttle position and vehicle speed. A malfunction in any of these solenoids can lead to improper hydraulic pressure regulation, resulting in poor transmission performance.
Importance of Proper Diagnosis
Diagnosing the P0968 code requires a systematic approach. It is crucial to check not only the solenoid itself but also related components such as wiring harnesses and connectors. A thorough inspection can help identify issues like corrosion, frayed wires, or faulty connectors that could be causing the open circuit condition.
Step-by-Step Diagnosis of P0968
Diagnosing a P0968 trouble code involves several key steps:
- Initial Inspection: Begin with a visual inspection of the wiring and connectors associated with the Pressure Control Solenoid “C”. Look for signs of damage, corrosion, or loose connections.
- Check Transmission Fluid: Inspect the transmission fluid level and condition. Contaminated or low fluid can cause various transmission issues. If necessary, change the fluid and filter before proceeding.
- Use Diagnostic Tools: Connect an OBD-II scanner to retrieve trouble codes and freeze frame data. This information can provide insights into when and why the code was triggered.
- Test Solenoid Resistance: With a multimeter, check the resistance of the Pressure Control Solenoid “C”. Compare your findings against manufacturer specifications to determine if it is functioning correctly.
- Inspect Related Components: If no issues are found with the solenoid itself, proceed to check other components such as the transmission pump, valve body, and PCM for faults.
- Perform Road Test: After addressing any identified issues, clear the codes and take the vehicle for a test drive to see if the P0968 code reappears.
Solution Methods for P0968
To resolve a P0968 trouble code effectively, consider implementing one or more of the following solutions:
- Replace Defective Pressure Control Solenoid: If testing reveals that the solenoid is faulty, replacing it is essential for restoring proper function.
- Repair Wiring and Connectors: Any damaged wiring or corroded connectors should be repaired or replaced to ensure proper electrical connectivity.
- Change Transmission Fluid and Filter: If fluid contamination is detected, changing both can help prevent further issues related to hydraulic pressure regulation.
- Inspect and Repair Transmission Pump: If the pump is found to be defective during diagnosis, it may need repair or replacement.
- Check and Replace PCM/TCM if Necessary: In rare cases where all other components are functioning correctly but issues persist, it may be necessary to inspect or replace the PCM/TCM.
Cost Estimates for Repairs
The cost of repairs related to a P0968 trouble code can vary significantly based on several factors:
- Pressure Control Solenoid Replacement: $150 – $500 (parts and labor)
- Wiring Repairs/Connector Replacement: $100 – $300 depending on extent of damage
- Transmission Fluid Change: $80 – $150 for fluid and filter replacement
- Transmission Pump Replacement: $300 – $800 depending on make/model
- PCM Replacement: $500 – $1500 depending on vehicle type
It’s advisable to obtain quotes from multiple repair shops to ensure competitive pricing.
Warnings and Recommendations
When dealing with a P0968 trouble code:
- Always refer to your vehicle’s service manual for specific diagnostic procedures related to your make and model.
- If you are not comfortable performing these diagnostics or repairs yourself, seek professional assistance from a certified mechanic.
- Ignoring this trouble code can lead to severe transmission damage over time; addressing it promptly can save significant repair costs down the line.
Closing Paragraph
The P0968 trouble code signifies an important issue within your vehicle’s automatic transmission system that requires prompt attention. Understanding its symptoms, causes, and diagnostic procedures empowers vehicle owners and DIY mechanics alike to address this issue effectively. By following systematic diagnostic steps and implementing appropriate solutions, you can restore your vehicle’s performance while avoiding costly repairs in the future.
Frequently Asked Questions About P0968
- What does error code P0968 mean?
P0968 indicates an open circuit in Pressure Control Solenoid “C,” affecting hydraulic pressure regulation in automatic transmissions. - What are common symptoms associated with P0968?
Symptoms include harsh shifting, increased fuel consumption, overheating transmission, and activation of limp mode. - Can I drive my car with a P0968 code?
While it may be possible temporarily, driving with this code can lead to more serious transmission damage. - How do I diagnose a P0968 trouble code?
Start with visual inspections of wiring/connectors, check fluid levels/condition, use an OBD-II scanner for codes, and test solenoids. - What repairs are typically needed for P0968?
Common repairs include replacing defective solenoids, repairing wiring/connectors, changing fluid/filter, or replacing faulty pumps. - Is it safe to ignore a P0968 code?
No; ignoring this code can lead to severe transmission issues that require costly repairs. - How much does it cost to fix a P0968 issue?
The total cost can range from $150 for minor repairs up to $1500 for major component replacements. - When should I seek professional help for a P0968 code?
If you lack experience with automotive repairs or if issues persist after DIY attempts, consult a certified mechanic.