P011A OBD II Trouble Code Engine Coolant Temperature Sensor 1/2 Correlation

How to quickly diagnose, repair, and info on symptoms and causes of a P011A code which is a correlation problem between sensors 1 and 2 for the engine coolant temperature.

Symptoms of P011A OBD II Trouble Code

  • Excessive rich or lean exhaust
  • Rough engine idle (especially at cold start up)
  • Diminished fuel efficiency
  • Decreased engine performance

Common Causes of P011A OBD II Trouble Code

  • Defective ECT sensor
  • Open or shorted ECT sensor wiring or connector
  • Low engine coolant condition
  • Bad thermostat
  • Faulty water pump
  • Air pocket in engine cooling system
  • PCM or PCM programming error

Severity of P011A OBD II Trouble Code

Since engine drivability, electronic cooling fan operation, and/or temperature gauge accuracy may be effected by the conditions which contribute to a code P011A being stored, it should be considered severe.