To activate gear changes in an automatic transmission, the ECU or TCM uses small plungers called shift solenoids. The code P0753 indicates that there is an electrical fault with solenoid 1-2, which does not allow correct operation of the transmission.
Given the fault code, P0753 indicates a problem with the 1-2 shift solenoid, that gear shift will eventually not be able to occur. This disables your car from driving, or at best, driving it in one gear.
Transmission Shift Solenoid Operation
most of automatic transmissions They have at least three valves, which are labeled A, B, and C. The set of codes is based on a specific fault that alerts the PCM and turns on the check engine light.
The shift solenoid valve circuit is designed to control the operation of the shift solenoids. To control the movement of fluids between the different hydraulic circuits and change the transmission ratio at the appropriate time.
This process maximizes engine performance levels at the lowest possible RPM. Transmission solenoids are responsible for opening or closing the valves, allowing transmission fluid to flow to the clutches.
This ensures smooth shifting of the transmission when the engine accelerates.
When the powertrain control module (PCM) detects an electrical fault in the shift solenoid valve “A” circuit, fault code P0753 will be written to memory and an error message will appear on the control panel.
What Is Code P0753?
Error code P0753 is defined as: Shift Solenoid A Electrical/Shift Solenoid Electrical Circuit 1-2. This means that there is an electrical abnormality detected by the PCM in the transmission shift solenoid A,
This is usually caused by a faulty shift solenoid, although there are other possible causes.
This code is a generic trouble code. It means you can detect it in almost any current car that has an automatic transmission.
The automatic transmission is what controls the gear changes necessary for your vehicle. To do this, it uses shift solenoids, which are activated according to the speed and internal pressure requirements in the component.
If one of the solenoids does not work, in this case 1-2, it will not be able to execute the corresponding gear change from first gear to second, or from second gear to first.
When the PCM detects that the gear does not match the actual gear when the vehicle is being driven, it may trigger the P0753 error code and activate the Check Engine light.
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Symptoms of Code P0753
Symptoms of a P0753 code activated, vary in intensity and quantity. You can find one or more of these combinations:
- The malfunction indicator light activates on your dashboard.
- Sudden and erratic changes.
- Gears 1 and 2 are not executed.
- Gears 1 and 2 slide.
- The engine stops while stopped in gear.
- Higher fuel consumption.
- The transmission overheats.
- Safe mode activated.
Causes of Code P0753
The code P0753 may be caused by one of the following factors:
- Insufficient transmission fluid.
- Dirty and contaminated transmission fluid/filter.
- Damaged wiring and connectors.
- Solenoids 1-2 are defective.
- Defective transmission pump.
- Internal pressure problems.
- problem with the valve body.
- ECU or TCM failure.
This code P0753 greatly affects the performance of your car. You must carry out the repair immediately.
How to Diagnose Code P0753?
As with other error codes, diagnosing this code requires the use of an OBD-II scanner and a digital multimeter.
The first thing you should look at when diagnosing a fault code related to the shift solenoid is the level and condition of the transmission fluid.
If the fluid smells burnt or is abnormal in any way, if it is excessively dirty or there are metal chips, then the transmission could have serious internal damage. Regular maintenance is an easy way to extend the life of your transmission.
In this case, you should remove the transmission pan and look for debris that may indicate transmission damage. This debris could be the clutch material.
If your transmission is not serviced on time, catastrophic wear will occur to internal components, which can include solenoids.
It is possible to flush the transmission and clear blocked hydraulic lines. However, this may only be a temporary solution if the valve body, clutches, or seals have already been damaged.
If the transmission fluid is clean and there are no leaks, then the wiring harness and connectors should be carefully examined for signs of damage and corrosion.
If no problems are found, then the 1-2 shift solenoid should be tested directly, following the manufacturer’s recommended test procedure.
If the solenoid is working properly, then other components such as the valve body, pressure regulating valve, or transmission pump could be faulty.
Proceed to check the pump pressure using a hand pump gauge, along with a hydraulic pressure diagram so the vehicle can see if the problem is with the pump, the electronic governor, or a faulty shift solenoid.
Next, proceed to check the reference voltage and ground signals at the affected shift solenoid. This means that you will have to disconnect all related control modules to avoid damage and memory loss.
Then test the system again to see if the code returns. If the problem persists, consider checking the PCM. Once all necessary repairs have been made, and before clearing the codes again, test the system one more time.
If the fault remains, in this case, you must dismantle the transmission and do the complete work of checking for damage, rebuilding, and repair.
How to Fix Code P0753
Repairing this code will depend on the results of the tests and diagnoses you perform. Never replace a part without checking that it is really damaged.
Common repairs to code P0753 are as follows:
- Change the transmission fluid and filter. This is usually sufficient for most cases.
- Replace defective 1-2 solenoid.
- Repair or replace faulty transmission pump.
- Transmission valve body repair or replacement.
- Transmission flush to clean the passages.
- Cleaning corrosion of connectors.
- Repair or replacement of wiring.
- Rebuild the transmission or replace it completely.
Common Errors When Diagnosing Code P0753
Many times, the shift solenoid can be blamed for the failure, when in reality it could be dirty transmission fluid or a clogged hydraulic line.
The solenoid may also need to be tested in a specific way, such as while the engine is running or in a particular gear.
If the correct procedures are not followed, the solenoid could appear defective when in fact it is not. Perform the diagnosis corresponding to the transmission of your car brand.
Is Code P0753 Serious?
Yeah, the code P0753 It is high severity. Its symptoms affect the car’s performance, and driving, and can activate fail-safe mode.
It will be very difficult to drive the car in these conditions, and there is a risk that the transmission will be neutralized and you will not be able to drive. It can leave you stranded in the middle of the road.
We do not recommend driving the car with the P0753 code activated, and you should take it for repair immediately.
How Can I Avoid Code P0753?
Internal failures that the transmission may have are easily detectable and avoidable by routinely checking the ATF transmission fluid.
If the fluid level in the system is low or has lost its properties due to excess temperature, dirt or chips, it will cause the internal systems to not function properly and wear out.
The ATF transmission fluid is very important for its proper functioning and must be in optimal condition. In general, this oil should be changed every 60 thousand kilometers, according to the manufacturer’s recommendations.
Another important point to take into account is the type of ATF oil. The one recommended by the manufacturer should be used, and combining brands should be avoided as much as possible.
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There is no doubt that this code is extremely serious. And although repairing it can be relatively easy and cheap, in some cases it can be very expensive.
You should also keep in mind that, if you drive the car in these conditions, you can affect many other components of the transmission, further aggravating the failure and greatly affecting your pocketbook.
If you want to know other articles similar to Code P0753. Shift Solenoid To Electric/Shift Solenoid Electrical Circuit 1-2 you can visit the category Fault Codes.