P0797 OBD Error Code: Problem & Solutions

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This OBD error code P0797 is set by the PCM when it notices an incongruence between the pressure applied and the pressure desired. These calculations are based on the load on the engine, or engine speed, vehicle speed, and throttle position

The hydraulic pressure in the transmission is controlled by the transmission by using the pressure control solenoid. This pressure is needed to apply various clutch packs in the transmission. These in turn provide the different gear ratios required to propel the vehicle efficiently on the road. When the Transmission Control Module is able to detect that the pressure control solenoid isn’t performing as it should, it will proceed to setting P0797 error code in the vehicle.

What causes this problem with the Pressure Control Solenoid C Stuck On?

Here’s a simple list of some common causes of a P0797 trouble code:

• Poor electronic pressure control solenoid
• Low level of automatic transmission fluid or dirty transmission fluid
• Failure of the transmission
• Malfunctioning PCM or Auto transmission control module
• Improper hydraulic pump or hydraulic line is blocked within the transmission

1. Pressure Control Solenoid - Get rid of your P0797 code check for repairs in the PCS and fix them. If that’s not solving the issue, then simply replace it.
2. Transmission Filter - The filter has to be in perfect condition so make sure you only go for the best parts. Parts Avatar has a wide range of brands compatible with a variety of vehicles. Order online and receive your order in few days.
3. Transmission Pump - Try to solve the problems otherwise find a replacement and resolve the P0797 error code.
4. Transmission Valve - Depending on the severity of damage you can try to repair or go for replacement with us. We also offer free shipping across Canada on orders over $99.
5. Transmission Connector - Find the best quality connectors for your car. It’s easy to order online with us, simply find the ones best for your vehicle, our customer service agent is available online 24/7 to assist you in the process. Track your shipment till it reaches your doorstep in just few days!

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0797 here:

Common Symptoms

Here are some common symptoms associated with error P0797:

• Disabled functioning of the shift
• Torque converter unable to engage
• Harsh shifting of the transmission
• Transmission slipping and overheating
• Decreased fuel efficiency

Here are some ways with the help of which you will be able to correct the OBD Code P0797

To repair a P0797 trouble code, take the following steps:

• Rebuild the damaged transmission and install a new torque converter
• Flush the fluid once transmission is rebuilt
• Repair any leaks
• Replace any wiring, connectors and components that may be damaged, burnt, or faulty
• Replacing the faulty hydraulic pump (requires removal and partially disassembly of the transmission)
• Replace the electronic pressure control solenoid and replace wiring, connectors, or components that are malfunctioning
• Replace the PCM if it is faulty

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0797 code to be stored:

• Start off by Procuring all the tools; a code reader, manual pressure gauge, hydraulic pressure diagram and a DVOM.
• Pull the transmission dipstick and check the level of the fluid and also the condition of it. Look for any abnormal looking or burnt smell coming from the fluid. If the it smells strange and or looks contaminated, drop the pan and look for evidence of debris that may be present. If the fluid level has been low, then that’s a sign the transmission has suffered, there may be a need to rebuild it.
• Follow the transmission level to detect any leaks. When they are found they should repaired and the transmission should be rebuilt too if it’s damaged.
• After fixing all those issues, start fill the transmission fluid to the right level and start it, wait till the engine reaches the normal operating temperature.
• Clear the trouble code P0797 and test drive the vehicle and note if it resets.
• It’s not time to examine the wiring, connectors and components for any malfunctions or damages. This may require a replacement of the entire internal transmission harness also.
• If the trouble code returns, connect the scanner to your vehicle's diagnostic port and download all the trouble codes and freeze frame the data.
• Now refer the hydraulic pressure diagram for your specific vehicle and hook a manual pressure pump to the transmission. Check the pressure produced by the pump in relation to that specified for your vehicle.
• If the OBD code was restored, use the DVOM (digital volt/ohmmeter) to check reference voltage and ground signal of the electronic pressure control solenoid which is the reason for the trouble code. If you find that the voltage or ground signal is open, you will have to check the continuity and the resistance of all the related circuits. Ensure that you disconnect any control modules on the circuit in-order to avoid the damage and memory loss.
• If you still find the code returning after sorting out all the issues, then you will have to check the PCM.
• Clear the P0797 trouble code again and see if the code returns

Common Mistakes When Diagnosing the P0797 Code

Replacing the high-pressure pump instead of checking the electronic pressure control solenoid or faulty wiring