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2002 CHEVROLET IMPALA
3.8L V6•FWD•AUTOMATIC•gas
7 active safety recalls on this vehicle — view recalls
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Repairs0Labor494Torque4212Fluid7DTC1027Battery1Maintenance0Recalls7
P1111low severityPowertrain

IAT Sensor Circuit Intermittent High Voltage

on 2002 Chevrolet Impala 3.8L 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

  1. Wiggle test IAT connector while monitoring signal
  2. Inspect wiring for damage
  3. Test IAT sensor resistance
  4. Check connector terminals

Repair notes

Clean and secure IAT sensor connector. Replace sensor if resistance is out of spec.

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