P0117 OBD-II Trouble Code: Engine Coolant Temperature (ECT) Sensor Circuit Low Output Problem

today we learn in this post what is p0117 OBD-II trouble code:

what will happend when come this code p0117 OBD-II trouble code: on your car dashboard

how you can resolve this problem of code p0117 OBD-II trouble code

what is the symptoms of p0177 OBD-II trouble code


P0117 OBD-II Trouble Code: Engine Coolant Temperature (ECT) Sensor Circuit Low Output Problem

What is the P0117 error code

P0117 is the OBD-II generic code that indicates the engine control module (ECM) has seen the ECT sensor output go less than 0.14 Volts or more than 140°C (284°F).

What is the symptoms of the P0117 error code?

  • ECM turns on the Check Engine Light
  • The engine may have a hard start when engine is cold.
  • The engine may run rough and hesitate until the engine warms up.
  • The engine should run close to normal once the engine warms up.


How does a mechanic diagnose the P0117 code?

  •  inspection to check for any electrical connector, wiring or sensor issues.
  • The electrician  will scan and remamber  the codes received and view the freeze frame data to see when the code was set.
  • The codes should then be reset to clear the OBD-II fault codes and retest the vehicle to see if the code comes back.
  • Disconnect ECT sensor, observe live data to see if readings go from over 284°F to -40°F.
  • If readings go to -40° F then replace the ECT sensor if not then look for shorted harness, connector or ECM.

      How tachnation can fix the P0117 code?

  • Resetting the fault codes and perform a road test
  • Repairing or replacing the ECT connector
  • Repairing or replacing the wiring as necessary
  • Replacing the ECT with a new sensor


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