P0750 - OBD Trouble Code

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Error Code P0750 is defined as Shift Solenoid ‘A’ Malfunction. This is a generic transmission diagnostic trouble code (DTC) and typically applies to OBD-II vehicles equipped with an automatic transmission. The P0750 OBD-II trouble code is associated with a general malfunction with the transmission Shift Solenoid "A" Circuit. This code may be seen with other shift solenoid or transmission codes. This fault will display a Check Engine Light on the dashboard and put the vehicle into a failsafe mode

P0750 is a diagnostic trouble code (DTC) for "Shift Solenoid 'A' Malfunction". 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. This process maximizes the performance level of the engine at the lowest RPM possible. This code means the PCM is not seeing the specified RPM change that happens during the shift from Gear 1 to Gear 2. The PCM controls the shift solenoid by commanding it when to engage or disengage.

What causes this problem with the Shift Solenoid A Malfunction?

• Inadequate transmission fuel level
• Flawed shift solenoid A
• Polluted or dirty transmission fluid
• Open or shorted shift solenoid circuit
• Dirty or clogged transmission filter
• Hydraulic fluid passage blockages inside transmission
• Damaged or fallacious wiring
• 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 P0750 should be rectified at earliest else it could develop into something much more serious fairly quickly. Symptoms which specify error code OBD P0750 may comprise:

• Transmission controller may enter into limp mode
• Reduced fuel efficiency
• Overheated Transmission
• Transmission slippage
• Failure of transmission to shift from any particular gear
• Illuminated check engine light

Trouble code P0750 is a first sign of serious transmission issue. Due to this trouble code you might face problem of failure of shifting gears, and in such case the vehicle should not be driven. This issue should be addressed immediately to avoid further transmission damage. To fix this issue following repairs or replacements may help:

• 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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Here are some steps which you should follow in order to diagnose this P0750 fault code:

• 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 P0750 Code

Technicians report that more frequently than not, faulty shift solenoid circuit malfunctions cause this code, and shift solenoid malfunctions are diagnosed and replaced in error.