P0739 OBD II Trouble Code TCM Engine Speed Output Circuit High

How to quickly diagnose, repair, and info on causes and symptoms of a P0739 high TCM engine speed output circuit malfunction trouble code.

Symptoms of P0739 OBD II Trouble Code

  • Hard shift
  • Fuel mileage drop
  • No start
  • Low speed
  • Engine stalling/bucking
  • Inaccurate speedometer
  • Less throttle response

Common Causes of P0739 OBD II Trouble Code

  • Defective Engine Speed Sensor (ESS)
  • Defective ECM (Engine Control Module)
  • Defective TCM (Transmission Control Module)
  • Wiring issue
  • Dirty pickup on the ESS
  • Connector problem

Severity of P0739 OBD II Trouble Code

I would say severity here would be low. Obviously, this depends on the specific situation but in general, this fault will only cause drivability issues. That being said, prolonged use with this fault may cost you in the long run so make sure to keep an eye on it.