P0968 Pressure control solenoid valve “C” control circuit open

P0968 – OBD-II Trouble Code Technical Description

Trouble code P0968 indicates an open circuit in the transmission pressure control solenoid valve "C" control circuit.

What does the fault code mean P0968?

Trouble code P0968 indicates an open circuit in the transmission pressure control solenoid valve “C” control circuit. This means that the vehicle control module (PCM) has detected a problem with the valve control circuit, which may cause that valve to not operate properly. Solenoid valves are used to regulate pressure in the transmission, and their improper operation can result in irregular or incorrect transmission operation, which can affect transmission performance and reliability. Code P0968 is set by the PCM when the pressure control solenoid valve “C” is not functioning properly due to an open control circuit.

Possible reasons

Possible reasons for DTC P0968:

• Broken or damaged wiring: Wiring problems, including broken or damaged wires connecting the “C” solenoid valve to the control engine module (PCM), can cause this error message to appear.
• Damage to connectors: Incorrect connection or damage to the connectors connecting valve “C” to the PCM may result in an open circuit and an error message.
• Solenoid valve “C” malfunction: The valve itself may be faulty due to wear, corrosion, or other reasons, causing it to not function properly.
• Engine Control Module (PCM) Problems: A malfunction in the PCM, which controls the transmission and receives signals from the solenoid valves, can also cause the error.
• Short circuit in control circuit: Damage to the control circuit, for example due to a short circuit, can cause an open circuit and activate an error.
• Weight problems: Improper or insufficient grounding of the transmission system or electronics can also cause P0968.

These are just some of the possible causes of the P0968 code, and diagnostics are required to determine the exact cause.

What are the symptoms of a fault code? P0968?

Symptoms for DTC P0968 may include the following:

• Gearshift problems: Uneven or jerky gear shifting may be noticed. Gears may not shift smoothly or may be delayed.
• Increased fuel consumption: Changes in transmission operation may result in increased fuel consumption due to improper gear shifting and engine operation.
• Acceleration delays: When you press the accelerator pedal, there may be a delay in the vehicle's acceleration response due to problems with gear shifting.
• Appearance of the “Check Engine” indicator: Trouble P0968 can cause the Check Engine light to appear on your dashboard.
• Unusual sounds or vibrations: There may be unusual sounds or vibrations coming from the transmission due to the pressure control system not functioning properly.
• Speed ​​Limit: In some cases, the vehicle may go into limp mode or limit its top speed to prevent damage.

These symptoms may occur to varying degrees depending on the specific cause of the error and the overall condition of the vehicle. If you notice these symptoms and the P0968 code appears, it is recommended that you contact a professional auto mechanic for diagnosis and repair.

How to diagnose a fault code P0968?

To diagnose DTC P0968, follow these steps:

1. Error scanning: Use an OBD-II diagnostic scanner to read trouble codes. Verify that the P0968 code is indeed present in the system.
2. Visual inspection of wiring: Check the wiring and connectors connecting the “C” solenoid valve to the control engine module. Look for damage, corrosion, or broken wires.
3. Checking the solenoid valve “C”: Use a multimeter to check the resistance of solenoid valve “C”. Make sure the resistance meets the manufacturer's specifications.
4. Checking transmission pressure: Use diagnostic equipment to check transmission pressure. Make sure the pressure meets the manufacturer's specifications.
5. Engine Control Module (PCM) Diagnosis: Perform tests to identify problems with the engine control module, which controls the transmission.
6. Checking other components: Check other components such as ground, sensors and other valves that may affect the operation of solenoid valve “C”.
7. Checking the oil filter and transmission fluid level: Make sure the transmission oil filter is not clogged and the transmission fluid level is within the recommended range.
8. Check for other fault codes: Check for other error codes that may be related to problems with the transmission or other vehicle systems.

Once the diagnostics are completed, you can determine the exact cause of the P0968 code and begin the necessary repairs or replacement of faulty components. If you are unable to solve the problem yourself, it is recommended that you contact an experienced auto mechanic or service center.

Diagnostic errors

When diagnosing DTC P0968, the following errors may occur:

• Incomplete or incorrect error scanning: Incorrectly scanning the system for other trouble codes or misinterpreting scan results may result in missing important data about the vehicle's condition.
• Failed visual check: Not every type of damage or broken wiring can be noticed at first glance. Incorrect or insufficient attention to visual inspection may result in important problems being missed.
• Incorrect interpretation of test results: Misinterpretation of test results for resistance, pressure and other parameters can lead to incorrect diagnosis and the choice of the wrong solution.
• Failure to check the entire system: The problem is not always limited to just the “C” solenoid valve. Failure to check other components such as wiring, connectors, control engine module, and transmission pressure may result in missing the true cause of the problem.
• Hardware malfunction: Faulty or uncalibrated diagnostic equipment may produce inaccurate results, which can make diagnosis difficult.
• Insufficient knowledge or experience: Insufficient knowledge or experience of an auto mechanic in diagnosing the transmission or electrical systems of a vehicle can lead to errors in diagnosis and repair.

It is important to pay due attention to each stage of diagnosis and follow professional recommendations.

How serious is the fault code? P0968?

Trouble code P0968 is serious because it indicates an open problem with the transmission pressure control solenoid valve “C” control circuit. Solenoid valves play a key role in the proper functioning of the transmission by regulating the oil pressure to change gears. The consequences of this malfunction may be as follows:

• Irregular gear shifting: An open circuit in the “C” valve control circuit may result in rough or unpredictable gear shifting, which may affect performance and driving safety.
• Increased transmission wear: Improper valve operation can cause increased wear on transmission components, which can ultimately lead to costly transmission repairs or replacement.
• Limitation of vehicle functionality: In some cases, the vehicle may go into limp mode or limit its performance to prevent further damage.
• Potential loss of control: In extreme cases, if the problem is not corrected, there may be a complete loss of transmission control, which can pose a serious risk to road safety.

Therefore, if you experience a P0968 code, it is important to immediately contact a qualified auto mechanic or auto repair shop to diagnose and fix the problem.

What repair will help eliminate the code? P0968?

The repair that will resolve the P0968 trouble code will depend on the specific cause of this error, several possible actions that can be taken are:

1. Replacing or repairing solenoid valve “C”: If the problem is a problem with the valve itself due to wear, corrosion, or other reasons, it can be replaced or repaired.
2. Checking and replacing wiring and connectors: Check the wiring and connectors connecting the “C” solenoid valve to the control engine module. Damaged or broken wires or connectors should be replaced.
3. Checking and servicing transmission pressure: Make sure the transmission pressure meets the manufacturer's specifications. If necessary, the pressure can be adjusted or set to normal limits.
4. Engine Control Module (PCM) Diagnosis and Service: If the problem is due to a faulty PCM, you can try to repair or replace it.
5. Checking and replacing other components: If necessary, check and replace other transmission components, such as the oil pump filter or oil pump.
6. Check for other fault codes: Check for other error codes that may be related to problems with the transmission or other vehicle systems and begin troubleshooting them.

It is important to contact a qualified auto mechanic or service center to diagnose and determine the exact cause of the problem so that proper repairs can be made and further problems can be avoided.

How to Diagnose and Fix P0968 Engine Code - OBD II Trouble Code Explain

P0968 – Brand specific information

Trouble code P0968 can occur on various brands of cars, several examples of car brands and their interpretation:

1. Toyota / Lexus: Open circuit in the transmission pressure control solenoid valve “C” control circuit.
2. Honda/Acura: Pressure regulator (PC) solenoid “C” control circuit is open.
3. Nissan / Infiniti: Open circuit in the transmission pressure control solenoid valve “C” control circuit.
4. Ford: Open circuit in the transmission pressure control solenoid valve “C” control circuit.
5. Chevrolet / GMC: Pressure regulator (PC) solenoid “C” control circuit is open.
6. Volkswagen / Audi: Pressure regulator (PC) solenoid “C” control circuit is open.
7. BMW / Mercedes Benz: Open circuit in the transmission pressure control solenoid valve “C” control circuit.

Each manufacturer may have its own interpretation of fault codes and specific solutions to resolve them. Therefore, it is recommended that you consult the official repair manuals for your specific vehicle make and model for accurate information and repair recommendations.