Guide To P0753 OBD Error Code Solutions

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P0753 is a diagnostic trouble code (DTC) for "Shift Solenoid A Electrical/1-2 Shift Solenoid Circuit Electrical". The purpose of the Shift Solenoid Circuit is for the PCM to monitor the shift solenoids to manage the movement of fluid between various hydraulic circuits and change the transmission gear ratio at the appropriate time. When the Powertrain Control Module (PCM) detects a malfunction within the Shift Solenoid "A" Shift Circuit a variety of codes can be triggered depending on the specific vehicle. In this case, the P0753 OBD-II trouble code is associated with an electrical malfunction with the transmission Shift Solenoid "A" Circuit.

Error Code P0753 suggests an abnormality in the transmission shift solenoid A detected by the PCM. This is a generic transmission diagnostic trouble code (DTC) and typically applies to OBD-II vehicles equipped with an automatic transmission. This means there’s an electrical abnormality detected by the PCM in the transmission shift solenoid A, which is usually caused by a faulty shift solenoid. The computer controlled automatic transmission uses shift solenoids to manage the transfer of fluid between hydraulic circuits and actuate a change in transmission gear ratio. If the desired gear ratio fails to coincide with the actual gear ratio detected, a code will be stored and a malfunction indicator lamp may be illuminated.

What causes this problem with the Shift Solenoid A Electrical?

• Defective shift solenoid
• Hydraulic blockages inside the internal transmission fluid passages
• Clogged transmission filter
• Internal transmission failures
• Insufficient transmission fluid
• Dirty or contaminated transmission fluid
• Faulty PCM

1. Shift Solenoid - A shift solenoid is a computer controlled, electronically activated component of an automatic transmission system. There are multiple shift solenoids in a transmission. They are responsible to open/close certain valves in the transmission to regulate the flow of the transmission fluid, which causes the transmission to actually shift gears. If you discover it faulty replace it immediately.
2. Shift Valves - The shift valves are simple balance- type spool valves that select between low and high gear when the manual valve is in drive. Using control pressure, they operate the bands, servos, and gear sets. Oil pressure from the other transmission valves acts on each end of the shift valve. Replace the fallacious shift valves in no time else can create serious problems.
3. Transmission Filter - The transmission filter is there to keep contaminating particles out of the transmission fluid. However, if the filter fails to keep particles out, the transmission fluid will quickly reach a point where it is too dirty to do its job efficiently.
4. Transmission Valve Body - The valve body contains many of the hydraulic valves, such as the pressure regulator, shift valves, manual valve, and others used in an automatic transmission. The valve body bolts to the bottom of the transmission case and is housed in the transmission pan. It should be inspecting thoroughly and replace or repair as required.

Error Code P0753 should be rectified at earliest else it could develop into something much more serious fairly quickly. Symptoms which specify error code OBD P0753 may comprise:

• Transmission may overheat
• Transmission may enter into Limp mode
• Other transmission error codes may store as well
• Transmission slippage
• Decreased fuel efficiency
• Illuminated check engine light

To correct or fix this code one should seek assistance from a trained automotive diagnostician but if you want to do it by yourself, please follow the below mentioned steps:

• Transmission fluid should be checked properly and if you discover it dirty or contaminated replace it.
• Level of transmission fluid should also be checked and need to be rectified.
• Electrical connections should be checked thoroughly and repaired as necessary.
• Valve body should also be replaced if found faulty.
• If in case Shift solenoid A is faulty then should be replaced as well.

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This trouble code is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model. Keep the below mentioned points in mind while fixing this code but it’s always good to have a qualified technician to look after your vehicle when this error code arises.

• Research the Technical Service Bulletins (TSB's) for the specific vehicle by year, model and transmission.
• You should also check the vehicle records to verify the last time that the filter and fluid was changed if possible.
• Make sure the fluid level is correct and inspect the condition of the fluid for contamination.
• Visual inspection to check the associated wiring for obvious defects such as scraping, rubbing, bare wires, or burn spots should be performed.
• Check the connectors and connections for security, corrosion and damaged pins. This process must include all wiring and connectors to the transmission solenoids, transmission pump and the PCM.
• Continuity checks should always be performed with the power removed from the circuit and the normal readings for wiring and connections should be 0 ohms of resistance unless otherwise specified by the technical data. Resistance or no continuity is an indication of faulty wiring that is open or shorted and must be repaired or replaced.

Common Mistakes When Diagnosing the P0753 Code

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.

P0758 - Shift Solenoid B Electrical

P0763 - Shift Solenoid C Electrical

P0768 - Shift Solenoid D Electrical

P076D - Shift Solenoid H Electrical

P0773 - Shift Solenoid E Electrical