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P0753 is a diagnostic trouble code (DTC) for "Shift Solenoid A Electrical/1-2 Shift Solenoid Circuit Electrical". 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 P0753 code indicates that the Powertrain Control Module (PCM) has detected an electrical abnormality in transmission shift solenoid A. Other associated codes include P0750, P0751, P0752, and P0754 trouble codes.
While the vehicle computer controls the shifting in an automatic transmission utilizing the shift solenoids, any variation in the gear ratio of the gears can cause the storage of a P0753 trouble code and the illumination of the Check Engine Light.
A common cause of the storage of a P0753 trouble code in the PCM is a faulty shift solenoid. Some other causes include blockage in the hydraulic system inside of the transmission, a mechanical failure in the transmission, a low transmission fluid level, and dirty or contaminated transmission fluid. The code could also derive from a faulty transmission control module or PCM.
Some common symptoms of a P0753 trouble code can range from a failure to shift into or out of gear to no detectable symptoms. Additional symptoms include the transmission control module entering Limp-in mode, slippage or overheating in the transmission, harsh shifting, and decreased fuel efficiency.
Diagnosing a P0753 trouble code requires a mechanic to use an OBD-II advanced scanner and a digital volt/ohmmeter and to follow specific steps, including:
The mechanic should begin by checking the transmission fluid level and condition. If the transmission fluid smells burnt, or otherwise abnormal, the mechanic should consider changing the fluid.
In addition, if the transmission smells or appears burnt, the mechanic should remove the transmission pan and look for debris that could indicate transmission damage, such as material from the clutch.
The mechanic should also inspect any wiring, connectors, or other components, looking for damage or fault there.
The mechanic should also fill the transmission to a high enough level to check for and repair any leaks.
If everything appears in proper working order, the mechanic should connect the advanced scanner to the diagnostic connector to download any freeze frame data or stored trouble codes.
Once all repairs have been made by the mechanic, start the vehicle and allow it to reach normal operating temperature before test driving the vehicle to make sure it runs properly.
The mechanic should then clear the code and test the system to see if the trouble code returns.
If the code returns, they need to check the pump pressure by using a manual pump gauge along with a hydraulic pressure diagram for the vehicle in question to see if the problem lies with the pump, electronic pressure regulator, or a faulty shift solenoid.
The mechanic can also check the reference voltage and ground signals at the affected shift solenoid. This requires the mechanic to disconnect all related control modules to prevent damage and memory loss.
Their next step is to retest the system before clearing the code and see if it returns.
If the problem still persists, they should consider checking the PCM to see if it is at fault.
Once the necessary repairs have been made, and before clearing the code again, the mechanic should retest the system.
A common mistake made by mechanics when diagnosing a P0753 trouble code is to replace a shift solenoid because they believe it has caused the problem, when in actuality the problem lies somewhere else.
If not dealt with, a P0753 trouble code can lead to problems with shifting gears, decreased fuel efficiency, and an overheating transmission, which can lead to further problems with the transmission if left untreated.
To repair and clear a P0753 trouble code, a mechanic can attempt the following repairs:
Fill the transmission fluid if low in an attempt to fix any leaks.
Once any leaks are repaired, fill the transmission to capacity with fluid.
If the transmission fluid has a burnt or abnormal smell or has debris from the clutch or transmission in it, the mechanic might have to rebuild the transmission due to excessive damage suffered from a low fluid condition.
This process also requires a fluid flush and replacement and the installation of a new torque converter.
The mechanic should likewise replace any burnt, faulty, or otherwise damaged wiring, connectors, and other components.
Replace the transmission pump if the problem lies there. This requires the mechanic to remove the transmission and partially disassemble.
Replace the shifter solenoid or solenoid pack if that part is damaged.
Replace the PCM if ultimately that component turns out to be the problem.
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