P0726 OBD II Trouble Code Engine Speed Input Circuit Range Performance

How to diagnose, repair, and info on causes of a P0726 engine code which pertains to an engine speed input range performance problem. Also includes links to relevant forum topics on the code.

Symptoms of P0726 OBD II Trouble Code

  • Transmission fails to shift or shifts erratically
  • Erratic or inoperative speedometer/odometer
  • Automatic transmissions may shift harshly (limp-in mode)
  • Inoperative or incorrect tachometer
  • Transmission slippage or delayed engagement
  • Additional transmission input/output speed codes may be stored

Common Causes of P0726 OBD II Trouble Code

  • Excessive metal deposits on the magnetic tip of the sensor in question
  • Defective engine speed input sensor or transmission output speed sensor
  • Damaged or worn engine speed sensor reluctor ring
  • Open or shorted wiring and/or connectors in the engine speed input circuit
  • Mechanical transmission failure which results in transmission/clutch slippage

Severity of P0726 OBD II Trouble Code

A stored code P0726 should be considered severe as the conditions which have caused it to be stored may result in damage to the transmission.