![]() ![]() You may also notice that the speedometer isn’t reading correctly. The code is generally accompanied by the Check Engine Light. A malfunctioning output shaft speed sensor.A malfunctioning transmission fluid temperature sensor. ![]() Problems with the electric wiring or connections.However, it may still be able to work by substituting values from other sensors to determine torque converter operation, shift timing, and EPC pressure. If the PCM/ECM (powertrain control module/engine control module) has determined that the OSS sensor is malfunctioning, the P0721 code will be triggered. This is done primarily to determine when to shift, the schedule for torque converter engagement and EPC (electronic pressure control) inside the transmission. It’s right before the drive axles so that it can take readings of the shaft’s speed. On vehicles with electronically-controlled transmissions, the OSS (output shaft speed sensor) is positioned at the end of the output shaft. The P0721 code is a sign that the TCM (transmission control module) isn’t properly converting incoming pulse signals.
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