DTC codes / P07xx · Transmission / P0785
P0785 sets when the transmission control module (TCM) detects an electrical fault in the shift/timing solenoid circuit, which controls hydraulic pressure timing during gear changes. The computer monitors the solenoid's voltage and current and flags the code when the signal falls outside the expected range.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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