Code Definition

P0720 — Output Speed Sensor Circuit Malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0720

P0720 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0720 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0720 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0720 code is set when the Engine Control Module (ECM) or Transmission Control Module (TCM) detects a malfunction in the output speed sensor circuit. This sensor measures the speed of the transmission output shaft, providing crucial data for the control of gear shifting, torque converter operation, and overall transmission performance. A malfunction in this circuit can be due to issues such as a faulty sensor, wiring problems, or bad connections. It can lead to incorrect speed readings, affecting the transmission's ability to shift correctly, potentially causing issues like erratic shiftin...

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