The P0725 code in your 2023 Ram 1500 indicates a malfunction in the engine speed input circuit to the transmission control module. The TCM needs engine RPM data to properly control shifting, torque converter operation, and other functions. This signal typically comes from the PCM or crankshaft position sensor and is shared with the transmission system.
Engine Speed Signal Importance
Your Ram 1500's 8-speed TorqueFlite transmission uses engine speed data for numerous calculations. Shift points depend on knowing engine RPM versus vehicle speed. Torque converter clutch engagement timing requires accurate engine speed. Without this data, the TCM cannot operate the transmission correctly.
Signal Path and Potential Failures
Engine speed data typically originates from the crankshaft position sensor, processed by the PCM, then shared with the TCM via the CAN bus network. P0725 can indicate issues anywhere in this chain: the original sensor, the PCM's processing, the CAN bus communication, or the TCM's reception of the data.
Common Causes
CAN bus communication errors between the PCM and TCM are common. Crankshaft position sensor issues that affect the original signal source cause downstream problems. Wiring issues in the communication network disrupt data sharing. Module configuration problems after service can affect which data the TCM expects to receive.
Symptoms in Your Ram
Shift timing may be erratic or inappropriate for current driving conditions. The transmission may feel like it doesn't know when to shift. Torque converter clutch operation may be incorrect. The check engine light illuminates, and additional codes may be present related to communication or the crankshaft sensor.