P0796 Performance or jamming of the automatic transmission pressure control solenoid valve “C” when turned off

P0796 – OBD-II Trouble Code Technical Description

P0796 indicates that the PCM has detected a problem with the performance or sticking of the pressure control solenoid valve "C" or its circuit.

What does the fault code mean P0796?

Trouble code P0796 indicates a problem with the pressure control solenoid valve “C” or its circuit in the automatic transmission system. This valve regulates the transmission fluid pressure required for correct gear shifting. When the pressure value does not meet the specified parameters, the P0796 error code appears, indicating a malfunction in the operation of this valve or its electrical circuit.

Possible reasons

Some of the possible causes of the P0796 trouble code are:

• Pressure control solenoid valve “C” malfunction: The valve itself may be damaged or stuck, resulting in improper pressure regulation in the transmission system.
• Problems with the electrical circuit of the valve: Opens, shorts, or other problems in the electrical circuit associated with solenoid valve “C” may cause the valve to operate poorly or incorrectly.
• Problems with pressure sensors: Malfunctions or incorrect calibration of pressure sensors in the automatic transmission system can also cause the P0796 code.
• Problems with the automatic transmission hydraulic system: Leaks, blockages or other problems in the transmission hydraulic system may cause incorrect pressure and therefore this error.
• Malfunctioning PCM: Problems with the engine control module (PCM), which controls the pressure control valve and processes signals from sensors, can also cause P0796.

These are just some of the possible reasons. To accurately determine the cause, it is necessary to conduct a more in-depth diagnosis of the automatic transmission system using appropriate equipment and tools.

What are the symptoms of a fault code? P0796?

Symptoms for DTC P0796 may include the following:

• Gear shifting problems: The vehicle may shift between gears in an unusual manner, such as hesitating or jerking.
• Unusual sounds or vibrations: If the automatic transmission system pressure is incorrect, unusual noises or vibrations may occur, especially when changing gears.
• Increased fuel consumption: Incorrect transmission pressure can result in increased fuel consumption due to inefficient transmission operation.
• Check Engine Light Illuminates: The appearance of the P0796 code is usually accompanied by the Check Engine light on the dashboard.
• Emergency mode: In some cases, the vehicle may go into limp mode to protect the engine and transmission from further damage.

These symptoms may occur to varying degrees depending on the specific problem in the transmission control system. If these symptoms occur, it is recommended that you contact a qualified auto mechanic for diagnosis and repair.

How to diagnose a fault code P0796?

The following approach is recommended to diagnose DTC P0796:

1. Reading fault codes: Use a diagnostic scanner to read trouble codes in the engine management system. Verify that code P0796 is present and make a note of other codes if they are also displayed.
2. Checking electrical connections and wiring: Check the condition of the electrical connections and wires associated with the pressure control solenoid valve “C”. Make sure all connections are secure and not damaged.
3. Checking Pressure Control Solenoid Valve “C”: Test the valve for malfunction or sticking. If the valve is not working properly, it should be replaced.
4. Diagnostics of the automatic transmission hydraulic system: Check the transmission hydraulic system for leaks, blockages, or other problems that may affect the operation of the pressure control solenoid valve.
5. Checking pressure sensors: Check the pressure sensors in the automatic transmission system for correct operation and compliance with manufacturer specifications.
6. Check PCM: If necessary, check the condition of the engine control module (PCM) and its software. Problems with the PCM can also be the cause of the P0796 code.
7. Real world testing: After diagnostics are completed, it is recommended that you test drive the vehicle to check the operation of the transmission and ensure that the problem has been successfully resolved.

When conducting diagnostics, you should take into account all possible causes that could lead to error P0796 and systematically eliminate them. If you are unsure of your skills or experience, it is recommended that you contact a professional auto mechanic or service center.

Diagnostic errors

When diagnosing DTC P0796, the following errors may occur:

• Insufficient checking of electrical connections: Make sure to thoroughly check all electrical connections and wiring associated with the pressure control solenoid valve “C”. Incorrect or incomplete connections may result in insufficient diagnosis.
• Replacement of components without prior testing: Sometimes mechanics may be tempted to replace components such as the pressure control solenoid valve without first doing a full diagnosis, which can be unnecessary and ineffective.
• Insufficient diagnostics of the hydraulic system: Problems in the automatic transmission hydraulic system, such as leaks or blockages, may be missed during diagnosis, which may cause the P0796 code to reappear after components are replaced.
• Ignoring other fault codes: Sometimes other trouble codes can affect the transmission system and cause P0796 to appear, but they may be undiagnosed or ignored.
• Misinterpretation of symptoms: Some symptoms may be mistakenly interpreted as problems with the pressure control valve, when the root of the problem may lie in other components of the transmission system.

To avoid these errors, it is important to carry out a complete and systematic diagnosis, taking into account all possible causes and factors affecting the operation of the automatic transmission system. In case of doubt or lack of experience, it is recommended to contact a qualified auto mechanic or service center.

How serious is the fault code? P0796?

Trouble code P0796 indicates a problem with the pressure control solenoid valve “C” or its circuit in the automatic transmission system. While the P0796 code itself is not critical or alarming, if it goes unaddressed, it can cause serious consequences to your vehicle's transmission and engine.

Incorrect pressure in the automatic transmission system can lead to problems with shifting gears, which in turn can lead to wear and damage to the transmission. In addition, incorrect pressure can place additional stress on the engine and other vehicle systems, which can lead to additional problems and increased fuel consumption.

Overall, although the P0796 code is not critical in the sense that it does not indicate an immediate danger to the safety or operation of the engine, it does indicate a problem that should be addressed as soon as possible to avoid further damage and costly repairs.

What repair will help eliminate the code? P0796?

Troubleshooting DTC P0796 typically involves the following steps:

1. Replacing or Repairing Pressure Control Solenoid Valve “C”: If the valve is faulty or stuck, it should be replaced or repaired.
2. Checking and replacing electrical connections and wiring: Check the condition of the electrical connections and wiring related to the solenoid valve “C”. Replace or repair any damaged or broken wires.
3. Diagnostics and repair of automatic transmission hydraulic system: Inspect the transmission hydraulic system for leaks, blockages, or other problems. Correct any problems found.
4. Checking and reprogramming the PCM: In rare cases, the problem may be related to the engine control module (PCM). Perform further diagnostics on the PCM and, if necessary, reprogram or replace it.
5. Real world testing: After repair work is carried out, it is recommended to test drive the vehicle to check the operation of the transmission and ensure that the problem has been successfully fixed.

These steps will help eliminate the causes of the P0796 trouble code and restore normal transmission operation. If you are unsure of your skills or experience, it is recommended that you contact a professional auto mechanic or service center for repair work.

How to Diagnose and Fix P0796 Engine Code - OBD II Trouble Code Explain

P0796 – Brand-specific information

Trouble code P0796 may have a different interpretation depending on the vehicle manufacturer, decoding the P0796 code for some popular car brands:

1. Ford, Lincoln, Mercury: Pressure control solenoid valve “C” is working or stuck.
2. Chevrolet, GMC, Cadillac, Buick: Pressure control solenoid valve “C” - low resistance / open circuit.
3. Toyota, Lexus, Scion: Pressure control solenoid valve “C” is working or stuck.
4. Honda Acura: Pressure control solenoid valve “C” is working or stuck.
5. Volkswagen, Audi, BMW, Mercedes-Benz: Pressure control solenoid valve “C” – low signal/open circuit.
6. Subaru, Mazda, Hyundai, Kia: Pressure control solenoid valve “C” is working or stuck.
7. Nissan, Infiniti: Pressure control solenoid valve “C” - low resistance / open circuit.
8. Chrysler, Dodge, Jeep, Ram: Pressure control solenoid valve “C” is working or stuck.

Please note that these are general guidelines only and your specific model and year of vehicle may require more detailed diagnostics and trouble code interpretation. If you are experiencing a problem with a P0796 code, it is recommended that you consult the official repair manuals for your specific vehicle or take it to a qualified auto mechanic for further diagnosis and repair.