Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage

Category

Powertrain - Computer and Auxiliary Controls

Severity

Check Engine Light

Applies to

Silverado, Sierra, Equinox, Malibu, Traverse

Related

No single generic twin. See OBD Codes List

Findings, check these first

• Failing IAT sensor with intermittent internal open
• IAT signal wire rubbed through near the airbox
• Loose terminals in the MAF/IAT combo connector
• rodent-chewed wiring at the intake duct
• Corroded PCM connector pins on the IAT circuit

Standard procedure

1. Monitor IAT on a Tech2 or GDS2 and watch for sudden -40 degree dropouts
2. Wiggle-test the intake harness while watching live IAT data
3. Inspect the MAF/IAT connector terminals for spread or corrosion
4. Measure IAT sensor resistance across a temperature swing versus spec
5. Replace the IAT or MAF assembly only if resistance is out of range, then clear and road test

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