P0721 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0721 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0721 code.

What Does P0721 Code Mean?

OBD-II Code P0721 is defined as a Output Speed Sensor Circuit Range/Performance

The Output Speed Sensor tells the Transmission Control Module (TCM) how fast the output shaft of the transmission is spinning so it can verify the correct gear is engaged. When the TCM receives an inaccurate or irrational signal from this sensor, it is an indication that there is an issue inside the transmission. The engine control module (PCM) or TCM will set code P0721.

P0721 Symptoms

• Increased fuel consumption
• Transmission may not shift properly

Common Problems That Trigger the P0721 Code

• Output shaft speed sensor failure
• Powertrain Control Module (PCM) failure
• Transmission Control Module (TCM) failure
• Wiring issue