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P0785 is a diagnostic trouble code (DTC) for "Shift/Timing Solenoid Malfunction/ 3-2 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 for $69.99. 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.
The appearance of the P0785 code means that the PCM detected an abnormal malfunction in the shift/time solenoid.
The transmission control module, or TCM, uses data from the shift/timing solenoids to manage hydraulic fluid transfers between circuits, and to perform changes in transmission gear ratios in order to accelerate, decelerate, optimize fuel efficiency, and maximize engine performance. If the data from the shift/timing solenoid does not match the manufacturer’s specifications for the particular situation or command, the TCM will assume that there is a malfunction, and alert the PCM to store the P0785 code.
The most likely causes of the P0785 code include:
The symptoms of the P0785 code can vary significantly. In some cases, the only symptom will be the illumination of the Check Engine Light. In other cases, the transmission may fail to shift into or out of certain gears, [shifting may be harsh], the transmission may slip or overheat, and the vehicle’s fuel efficiency may suffer. It is also likely that the PCM will store other shift solenoid codes along with the P0785 code.
In repairs where the transmission fluid could be causing an inaccurate data reading, the first step a mechanic should take is to inspect the transmission fluid. Low transmission fluid should be remedied. Dirty transmission fluid should be drained and replaced. The code should then be cleared from the PCM, and the system should be retested. If the code returns, the mechanic has successfully diagnosed a problem within the shift/timing solenoid or related components.
In many cases, shift solenoids are replaced when the malfunction actually lied in the shift solenoid circuitry. It is important to test all electrical components before replacing any parts in order to ensure that this code will not return shortly after repairs.
If the P0785 code is detected by an OBD-II scanner, the issue needs to be addressed right away. While in some cases, there may be no noticeable symptoms, the transmission may still experience malfunctions. If this issue is left unaddressed, the vehicle could become inoperable.
There are many ways that a technician can address a P0785 code. These methods may include:
After each repair is performed, it is important to clear the code from the PCM and retest the system. If the code does not return, it may mean that the mechanic has performed the right repair to fix the issue. If it does return, it indicates that the problem is ongoing. This procedure helps narrow down the true cause behind the P0785 code.
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