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2001 GMC SAVANA
4.3L V6•RWD•gas•L35
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Repairs0Labor505Torque139Fluid8DTC1765Battery1Maintenance0Recalls0
P1140low severityPowertrain

Intake Air Temperature Rationality

on 2001 GMC Savana 4.3L V6 · RWD

What this code means

The intake air temperature reading does not make sense compared to other sensors. The PCM sees an implausible IAT value.

Symptoms

  • Check engine light on
  • Hard cold starts
  • Poor fuel economy

Common causes

  • Faulty IAT sensor
  • Wiring or connector fault
  • Sensor out of range vs coolant temp
  • Bad PCM input

Diagnostic steps

  1. Scan and compare IAT to ECT at cold start
  2. Inspect IAT sensor wiring
  3. Test sensor resistance
  4. Replace IAT sensor if faulty
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