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P0782 is a diagnostic trouble code (DTC) for "2-3 Shift Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0782 trouble code means that the Powertrain Control Module (PCM) has detected a problem with the shift function between gears 2 and 3. Some other transmission related trouble codes that can also occur alongside this code include P0780, P0781, P0783, P0784, P0785, P0786, P0787, P0788, and P0789.
When there is a discrepancy between the desired gear ration and what is actually produced, the PCM stores a P0782 trouble code and illuminates the Check Engine Light. Mechanics should keep in mind that certain makes and models might require multiple failure cycles before the Check Engine Light illuminates.
Some of the issues that can cause the storage of a P0782 trouble code include faulty solenoids, blockage in the hydraulics inside of the transmission, transmission failure, and a low or contaminated transmission fluid condition. A fault in the PCM or Transmission Control Unit (TCM) can also cause the storage of this code.
Symptoms range from no signs at all, to a failure on the part of the transmission, to shift into specific gears. More far-ranging effects include decreased fuel efficiency, slippage, overheating, or harsh shifting of the transmission.
To successfully diagnose the problems that can cause a P0782 trouble code, a mechanic should have an advanced scanner, a manual pressure gauge, hydraulic pressure diagram, and a digital volt/ohmmeter. Once they have these tools, the mechanic should diagnose the trouble code by completing the following steps:
Inspect the transmission fluid by removing the dipstick.
If the fluid smells burnt or looks abnormal, remove the transmission pan and check it for debris.
After the transmission is rebuilt, if needed, fill it with fluid enough to fix any leaks.
Once repaired, fill the transmission fluid to its normal level.
In addition to the fluid, check all the wiring, connectors, and components for any damage.
Download all of the stored codes and freeze-frame data using the advanced scanner, and then clear the P0782 trouble code.
Start the vehicle and allow it to reach a normal operating temperature before test driving it to see if the code returns.
If the code is still present, check the pressure of the hydraulic pump using a manual pressure gauge.
With the aid of a hydraulic pressure diagram, determine the operating pressure of the pump and compare it to the manufacturer's specifications.
If the code returns upon clearing, check the reference voltage and ground circuits to see if any are open using the digital volt/ohmmeter.
Using a manual wiring diagram, the mechanic should test all of the related circuits and the solenoid if they think a shift solenoid is at fault.
After solenoid replacement, clear the code and retest the system.
Check the PCM if everything checks out and the code persists.
Upon replacing the PCM, if needed, clear the code and retest the system again to see if the code returns.
A common misdiagnosis is for a mechanic to attribute the problem to a faulty shift solenoid circuit. Subsequent replacement of the shift solenoid does not fix the problem and the code returns.
A P0782 trouble code if left unfixed could result in trouble shifting, reduced fuel efficiency, and transmission overheating. If the transmission is left in a low-fluid condition for too long, damage could occur to the transmission requiring a mechanic to have to rebuild it.
To fix a P0782 trouble code is a multi-step process and includes the following repairs. The mechanic must:
Rebuild the transmission if damaged by a low fluid condition. The mechanic also needs to replace the torque converter in this instance.
Replace the hydraulic pump if it is found faulty. Replacing the pump requires the mechanic to remove the transmission and partially disassemble the component.
Replace any faulty circuits, shift solenoid or shift solenoids packs.
Replace the PCM or TCM if either is found to be defective.
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