DTC codes / P08xx · Transmission / P0846
P0846 indicates that the transmission control module has detected an out-of-range or erratic signal from the 'B' circuit of the transmission fluid pressure sensor or switch, which is typically used to monitor line pressure or a specific clutch circuit. The computer compares the sensor's voltage or switch state against expected values for the current gear and load, and it sets this code when the signal falls outside the acceptable performance window for a calibrated period.
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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