DTC codes / P09xx · Transmission / P0923
P0923 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the electrical circuit that controls the forward gear shift actuator, which is typically a solenoid or motor responsible for engaging forward gears in an automated manual or dual-clutch transmission. The high voltage reading suggests an open circuit, a short to power, or a faulty actuator, preventing the PCM from properly commanding gear engagement.
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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