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You will not usually see any drivability issues with this other than the check engine light (CEL).

You may find one or more of the following issues:

  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Continuously running coolant fan
  • Faulty coolant temperature sensor
  • Faulty air inlet temperature (IAT) sensor

Possible fixes:

  • Verify coolant level and strength
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat
  • If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code

Other ECT sensor and circuit related DTCs: P0115, P0116, P0117, P0118, P0119, P0125

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