P1112low severityPowertrain
IAT Sensor Circuit Intermittent Low Voltage
on 2011 GMC Terrain 2.4L I4 · FWD
What this code means
The PCM detected intermittent low voltage on the Intake Air Temperature sensor circuit, indicating a sporadic short to ground.
Symptoms
- Check Engine Light (intermittent)
- Incorrect fueling calculations
- Intermittent performance issues
Common causes
- Shorted IAT sensor wiring
- Faulty IAT sensor
- Water intrusion in connector
- Chafed wiring
Diagnostic steps
- Wiggle test IAT connector
- Inspect wiring for shorts to ground
- Test IAT sensor resistance
- Check for water in connector
Repair notes
Repair shorted wiring or replace IAT sensor.
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