Guide To P0971 OBD Error Code Solutions

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How does the control circuit of pressure control solenoid “C” turn high? What does P0971 error code mean? Are there any symptoms? The hydraulic fluid is generally used by the transmission control module (TCM) to engage with the clutch so that it remains smooth while driving. If there are any faults in the electrical circuit or if the solenoid is faulty, the P0971 error code will be stored in the vehicle.

This is a general type of error code which has a problem in the pressure control solenoid. It is an integral part of the automatic transmission. The hydraulic shift pressure is calculated by the powertrain control module (PCM) which mainly focuses on engine load, engine speed, vehicle speed, and throttle position. As the PCM controls the hydraulic pressure, the pressure control solenoid will regulate them. If the voltage is high and if it is detected by the PCM, then the P0971 error code will be stored.

What causes this problem with the Pressure Control Solenoid "C" Control Circuit High?

• Malfunctioning of pressure control solenoid.
• Muddy transmission fluid.
• Constrained transmission filter.
• Transmission pump has issues.
• Damaged transmission valve body.
• Clogged hydraulic passages.
• Stained connectors.
• Broken wires.
• Problematic PCM.

1. Pressure control solenoid – A faulty pressure control solenoid needs an immediate replacement for the system to function normally.
2. Pressure control solenoid wiring harness – The damaged pressure control solenoid wiring harness needs immediate fixation to avoid P0971 error code.
3. Transmission control module - A faulty TCM needs to be replaced quickly so that you can skip P0971 error code.
4. Transmission filter – Do you find any blocks or damages in the transmission filter? Remove them as soon as possible.
5. Transmission pump – Replacing the defective transmission pump is always the best idea to avoid troubles in the system.
6. Transmission valve body - Visually inspect this component. If you find them damaged, replace them with a new transmission valve body from Parts Avatar.
7. Pressure control solenoid valve – This defective component must be changed quickly so as to avoid P0971 error code.
8. Powertrain control module - Do you find this component to be broken or damaged? Fix the issue soon.
9. Engine control module - A defective ECM have to be changed immediately to avoid system malfunctioning.
10. Transmission fluid – Fill the fluid up to the necessary level so that the system functions correctly.

Willing to know some common symptoms of OBD Code P0971? Your wish is our demand. Have a look at them below:

Common Symptoms:

• Higher fuel consumption.
  
• Check engine light is initiated.
• Overheating of transmission.
• Transmission slips when it is unstable.
• Rough shift by transmission.
• Symptoms of a misfire.
• Transmission reaches limp mode by the PCM.

We have listed out some ways which would help you to correct the occurrence of OBD Code P0971. They are mentioned here as follows:

• Fluid and filter must be changed.
• The pressure control solenoid needs replacement.
• Replacing the broken transmission pump.
• Transmission valve body must be repaired.
• Flushing of transmission to clear blocks.
• Damaged connectors have to be altered.
• Electrical wire replacement.
• Changing the PCM.

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of pressure control solenoid, pressure control solenoid wiring harness, transmission control module, transmission fluid, transmission filter, transmission pump, transmission valve body, pressure control solenoid valve assembly, and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

• You have to carefully research for the technical service bulletin for your vehicle on the basis of the year, model and transmission before you proceed with any diagnostic process. This is highly essential as it can save plenty of time by guiding you on the right path.
• The initial step is to check the level and condition of the fluid as they can be contaminated. Before you proceed with this step, it is best to check your record as to when the fluid and filter was previously changed.
• Carefully inspect the condition of the wires, connectors, electrical connections, and pins for any damages or corrosions. This inspection must also include other components like transmission pressure control solenoids, transmission pump, and PCM. You can drive the transmission pump mechanically depending on the specific arrangement.
• Advanced tools are needed to perform advanced steps which is specific to your vehicle. To perform this diagnosis, you need a digital voltmeter and technical references which is specific to your vehicle. Before proceeding with advanced step gather the specific troubleshoot data for your vehicle. For specific models, the voltage and fluid pressure requirement will change in response to design and alignment.
• If it is not mentioned specifically, the resistance must be set to 0 ohms for wires and connections. Frequent continuity check must be carried out by removing power so that there is no damage to the circuit. If there is no proper continuity, then there will be an open or short circuit which needs a quick replacement.

Common Mistakes When Diagnosing the P0971 Code

• Problems of misfire by the engine.
• The improper functioning of the transmission pump.
• Transmission faces internal issues.
• Driveline problem.

P0970 - Pressure Control Solenoid "C" Control Circuit Low