P0721 OBD II Trouble Code Output Speed Sensor Range/Performance

How to quickly diagnose, repair, and info on causes and symptoms of a diagnostic code P0721 which means there is an output speed output circuit performance problem.

Symptoms of P0721 OBD II Trouble Code

  • Poor fuel economy
  • Check Engine Light illuminated
  • Transmission does not shift
  • Transmission Shifts roughly
  • Possibly misfire-like symptoms
  • PCM puts the engine into limp mode
  • Speedometer shows incorrect or erratic reading

Common Causes of P0721 OBD II Trouble Code

  • Defective Output Speed Sensor
  • Dirty or contaminated fluid
  • Dirty or clogged transmission filter
  • Defective Coolant Temperature Sensor
  • Defective Transmission Valve Body
  • Restricted hydraulic passages
  • Faulty Shift Solenoid
  • Corroded or damaged connector
  • Faulty or damaged wiring
  • Faulty PCM

Severity of P0721 OBD II Trouble Code

The severity of this code normally starts as moderate, but it can progress to a more severe level rapidly when not corrected in a timely manner.