P0115 – Engine Coolant Temperature Circuit Malfunction

Description

The ECM detects an incorrect or implausible signal from the ECT sensor.

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Symptoms

  • Hard starting
  • Poor fuel economy
  • Cooling fan issues

Causes

  • Faulty ECT sensor
  • Wiring issues
  • Low coolant

Diagnosis

  • Monitor ECT data
  • Inspect wiring
  • Check coolant

Repair

  • Replace ECT sensor
  • Repair wiring
  • Refill coolant

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