DTC codes / P28xx · Transmission / P2804
P2804 indicates that the transmission control module (TCM) has detected an intermittent fault in the signal circuit for Transmission Range Sensor B, which is often the output speed or range confirmation sensor inside the transmission. The TCM sets this code when the sensor signal drops out or becomes erratic for a brief period, even if the fault does not persist long enough to trigger a hard failure.
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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