DTC P0721 Output Speed Sensor Range/Performance

DTC P0721 points to a problem with the Output Speed Sensor (OSS) Range/Performance. This code occurs when the Powertrain Control Module (PCM) detects that the signal from the output speed sensor falls outside the expected range or doesn’t match the vehicle’s speed.

1. What does P0721 code mean?

DTC P0721 signifies an anomaly in the output speed sensor’s signal range, either being too high or too low compared to the expected vehicle speed.

2. What are the causes of DTC P0721?

Several potential causes of DTC P0721 include:

  • Faulty Output Speed Sensor: A malfunctioning or failed output speed sensor could provide inaccurate readings.
  • Damaged Wiring or Connectors: Worn, corroded, or broken wiring/connectors between the sensor and the PCM.
  • Sensor Alignment or Installation: An improperly installed or misaligned output speed sensor.
  • Transmission Issues: Problems within the transmission or related components affecting sensor readings.
  • PCM or Module Problems: Rarely, issues within the PCM or other related modules could cause this fault.

3. What are the symptoms of DTC P0721?

Signs commonly associated with DTC P0721 might include:

  • Check Engine Light: Illumination of the Check Engine Light due to the detected fault.
  • Transmission Problems: Abnormal shifting patterns, delayed or harsh shifting, or failure to shift gears properly.
  • Speedometer Issues: Incorrect or erratic speedometer readings due to inconsistent speed sensor data.

4. How to diagnose DTC P0721?

Diagnosing DTC P0721 may involve these steps:

  • OBD-II Scanner: Retrieving the code and checking related codes stored in the PCM for further insights.
  • Visual Inspection: Examining the output speed sensor, wiring, and connectors for physical damage or wear.
  • Sensor Testing: Testing the output speed sensor’s functionality, alignment, and signal output.
  • Circuit Testing: Checking the circuit integrity, including continuity, resistance, and voltage testing along the sensor circuit.

5. How to fix DTC P0721 problem?

Addressing DTC P0721 might require these steps:


Resolving DTC P0721 involves rectifying issues within the Output Speed Sensor Range/Performance, ensuring accurate speed readings crucial for proper transmission function and overall vehicle performance. Swift diagnosis and addressing the root cause are essential to prevent potential transmission-related complications.