P0112
Intake Air Temperature Sensor Low Input
The IAT signal voltage is below threshold, which the ECU interprets as an implausibly hot intake (low NTC resistance). Usually a wiring short to ground or a failed sensor.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to groundCommon
- Sensor failed shorted internallyPossible
Parts involved
- Intake Air Temperature Sensor
- Intake Air Temperature Sensor Wiring
P0112 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.