P011B OBD II Trouble Code Engine Coolant Temperature/Intake Air Temperature Correlation

How to quickly diagnose, repair, and info on symptoms and causes of a P011B code which is a correlation problem between the engine coolant and air intake temperature sensors.

Symptoms of P011B OBD II Trouble Code

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

Common Causes of P011B OBD II Trouble Code

  • Defective ECT/IAT sensor
  • Open or shorted ECT/IAT 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 P011B OBD II Trouble Code

Engine drivability, electronic cooling fan operation, and/or temperature gauge accuracy may be effected by the conditions which contribute to a code P011B being stored, it should addressed with urgency.