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2012 CHEVROLET EXPRESS

4.3L V6 VortecRWDAUTOMATICgas
6 active safety recalls on this vehicle — view recalls
Repairs0Labor506Torque4947Fluid7DTC952Battery1Maintenance0Recalls6
P1111low severityPowertrain

IAT Sensor Circuit Intermittent High Voltage

on 2012 Chevrolet Express 4.3L V6 Vortec · RWD

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.

Other Powertrain codes on this vehicle

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