P0116 – ECT Sensor Range/Performance

Description

The ECM detects an ECT signal outside expected range.

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Symptoms

  • Long warm-up
  • Poor heater output
  • High idle

Causes

  • Faulty ECT sensor
  • Low coolant
  • Thermostat issues

Diagnosis

  • Monitor ECT data
  • Check coolant
  • Inspect thermostat

Repair

  • Replace ECT sensor
  • Refill coolant
  • Replace thermostat

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