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Code P0117 - Engine Coolant Temperature Sensor Low

  1. Connect and operate scan tester, following manufacturer's instructions. Read engine coolant temperature. If indicated coolant temperature is greater than 230°F (110°C), go to next step. If indicated coolant temperature is not greater than 230°F (110°C), problem is intermittent. Inspect for poor connections or loose wires associated with ECT sensor and ECM, then repair as necessary.
  2. Turn ignition off. Unplug ECT connector. Turn ignition on. Read engine coolant temperature. If indicated coolant temperature is greater than 230°F (110°C), go to next step. If indicated coolant temperature is not greater than 230°F (110°C), replace ECT sensor.
  3. Turn ignition off. Unplug 22-pin connector "D" from ECM. Test for continuity between ECT sensor connector Red/White wire and ground. If continuity does not exist, temporarily substitute known good ECM, then retest system. If continuity exists, repair Red/White wire.
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