Intake Air Temperature (IAT) Sensor Circuit Intermittent Low 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

• Shorted IAT sensor element pulling voltage low
• IAT signal wire shorted to ground in the intake harness
• Oil-contaminated MAF/IAT combo connector
• Failed MAF assembly with internal IAT short
• PCM 5V reference pulled low by another sensor

Standard procedure

1. Watch live IAT data on a Tech2 or GDS2 for sudden implausible heat spikes
2. Disconnect the MAF/IAT connector and check whether voltage returns to bias level
3. Inspect the intake harness for melted or pinched sections near the exhaust
4. Test IAT resistance versus temperature chart before replacing anything
5. Replace the MAF/IAT assembly only on failed resistance tests, then clear and road test

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