P0746 OBD Error Code: Problem & Solutions

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The OBD error P0746 is set when the required fluid pressure in your vehicle is not matching the amount that is detected by the Powertrain Control Module. The Check Engine light will hence come up too. However, this will differ based on the make and models of different vehicles, in some the error has to occur several times before the check engine light lights up.

In an automatic transmission vehicle, torque converter lockup and shift actuation require varying amounts of hydraulic pressure. The pump pressure requirement varies from vehicle to vehicle. This is so because the amount of pressure required is based on some specifications like vehicle speed, engine load and speed and throttle position.

What causes this problem with the Pressure Control Solenoid A Performance or Stuck Off?

• A fault in the electronic pressure control solenoid
• Mechanical issues present in the transmission
• The internal transmission fuel passages show blockages
• Transmission fluid levels are low
• Transmission fluid has become contaminated
• A fault in the transmission control module
• Malfunction of the Powertrain Control Module (rare)

1. Pressure Control Solenoid - Repair it first, if that’s not solving the problem you will have to replace it.
2. Transmission Filter - Choose from a vast range of OEM car parts at Parts Avatar. Shop Online 24x7. Don’t compromise on quality, your car deserves the best.
3. Transmission Pump - Test and see if repairs can fix the issue, or you can order a new one and replace it. Check if the P0746 error returns after replacement and clearing the code.
4. Transmission Valve - Repair or replace from Parts Avatar. You can order from the comfort of your home, and track the shipment till it reaches you safely right at your doorstep.
5. Pressure Control Solenoid Connector - Replacing may be the only option if repairing isn’t helping the situation. Don’t hesitate from fitting new connectors, it will help resolve the P0746 error.
6. Hydraulic Pipes - Repair or replace as requirement. Only go for the best quality for long term solution.
7. Powertrain Control Module - Replace your PCM with us, we value quality and our prices are unbeatable. We ship across Canada and offer free shipping on orders over CAD $99.

It is vital 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 P0746 here:

Common Symptoms

• Check Engine Light On
• Vehicle will not shift from gears properly
• Vehicle may show issues with drivability
• Lowered fuel economy
• No adverse conditions noticed by the driver in some rare situations
• Performance problems may come up in some cases

Want to correct the Trouble Code P0746? Read these points mentioned below:

• The defective pump will have to either be repaired or replaced
• Adjust the transmission fluid level to the right one
• Replace all the contaminated transmission fluid properly
• The faulty line pressure solenoid valve will need replacement
• The line pressure solenoid valve circuit electrical connections should be fixed.

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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 P0746 code to be stored:

• Start off your diagnosis of transmission with a careful inspection of the transmission fluid dipstick. Ensure that the fluid level is as per the requirement mentioned by your specific vehicle’s manufacturer. Also, take time out to see if the fluid is in good condition, there should not be any burned smell or any such abnormal characteristics to it. If they are present, then you will have to consider the fluid inadequate.
• If you have found that the fluid was burned, then it’s a sign that the transmission was operating when the fluid level was too low. Unfortunately, it may also have caused major internal mechanical failure to the transmission. This burned fluid will have to be sorted out by first removing the transmission pan and checking for any clutch material or debris present.
• Now, proceed to checking the wiring and circuitry and connectors, any damaged or burned ones will have to be replaced.
• If upon inspection you have found that all the system wiring, connectors as well as components are normal and working well you will need to retrieve all the codes set. For this simply connect the scanner to the diagnostic port of your vehicle and freeze frame the data. Also make note of them in order, so that you can refer them in future if there’s an intermittent code present.
• Operate your vehicle, and see if the code is reset. The PCM may get into readiness mode, this is a sign that you most probably have an intermittent condition. These intermittent conditions are complex and, in most cases, will need the problem to worsen before correct diagnosis can be made.
• Compare your findings with your manufacturers specifications and accordingly proceed with repairs. Low pump pressure could also be due to clogged hydraulic passages, defect in the pump, fault in the shift solenoids or electronic pressure regulator. In order to have the pump replaced, you will have to remove the transmission and partial disassembly will also be needed.
• When on test drive, the code immediately reset, and the transmission is functioning as normal, proceed to check reference voltage and ground signals present at the electronic pressure control solenoid
• Make sure you retest the system every time a repair or replacement of connectors is done. This is to ensure that the repair/replacement was successful. You can use the manufacturers wiring diagram and other material if unsure about the components and their locations. Once you have located the electronic pressure control solenoid, test all the circuits relate as well as the solenoid itself for resistance. Also, check for continuity, all these findings will have to be compared to the ones your manufacturer is stating as requirement for your vehicle.
• If the electronic pressure control solenoid has failed to get activated manually, then replace it and retest the transmission control system to check for installation success.
• If you have concluded that all the system circuits are intact and working perfectly fine, then move on to manually activating the electronic pressure solenoid by connecting the scanner to the diagnostic connector.
• Upon testing if the solenoid is functioning perfectly fine, and all the circuits are also in sync with the specifications set by your vehicle manufacturer, then you have few suspects left to consider. It could be a malfunctioning high-pressure pump, torque converter, or PCM. However, the PCM failure is a rarity, replacing the PCM will also require reprogramming.

Common Mistakes When Diagnosing the P0746 Code

The high-pressure pump is mostly seen as the culprit for the code, hence leading to be replaced. The more likely falters of this OBD error P0746 are the wiring malfunctions and faulty electronic pressure control solenoids. Being mindful of this can help in thorough diagnosis and reduce unnecessary expenditure on replacing parts that aren’t faulty.