P0111low severityPowertrain
IAT Sensor 1 Circuit Range/Performance
on 2004 GMC Yukon 5.3L V8 Vortec · RWD
What this code means
The IAT sensor reading is not within the expected range for current conditions.
Symptoms
- Check Engine Light
- Incorrect fueling
- Poor cold start
Common causes
- Sensor in wrong location
- Heat-soaked sensor
- Contaminated sensor element
Diagnostic steps
- Compare IAT to ambient temp at cold start
- Check sensor location
- Inspect for heat sources near sensor
Repair notes
Replace or relocate IAT sensor.
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