P1111low severityPowertrain
IAT Sensor Circuit Intermittent High Voltage
on 2008 Cadillac STS 3.6L V6 · FWD
What this code means
The PCM detected intermittent high voltage on the Intake Air Temperature sensor circuit, indicating a sporadic open circuit or connection issue.
Symptoms
- Check Engine Light (intermittent)
- Incorrect fueling in cold weather
- Poor fuel economy
- Intermittent performance issues
Common causes
- Loose IAT sensor connector
- Intermittent open in wiring
- Faulty IAT sensor
- Corroded terminals
Diagnostic steps
- Wiggle test IAT connector while monitoring signal
- Inspect wiring for damage
- Test IAT sensor resistance
- Check connector terminals
Repair notes
Clean and secure IAT sensor connector. Replace sensor if resistance is out of spec.
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