P0112
Low SeverityIntake Air Temperature Sensor Circuit Low
Fuel System
P0112 — Instant Answer
Intake Air Temperature Sensor Circuit Low
Severity: LOW SEVERITY
Meaning: IAT sensor voltage is too low, indicating impossibly high air temperature. Usually a short circuit in the sensor or wiring.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $10 - $30
Most common causes:
- 1. Shorted IAT sensor (35-45% of cases)
- 2. Short in wiring (10-25% of cases)
- 3. Corroded connector (10-25% of cases)
Symptoms
- ⚠️Check engine light
- ⚠️Slightly rich running
- ⚠️Decreased fuel economy
Related Symptoms
Common Causes
How to Diagnose P0112
- 1Disconnect sensor — if code changes to P0113, sensor is bad
- 2Check wiring for shorts to ground
- 3Measure sensor resistance
- 4Replace sensor
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Repair guides, symptom pages, and wiring diagrams related to P0112.
Related Codes
The IAT sensor circuit has a fault. This sensor measures incoming air temperature for fuel calculations.
IAT sensor voltage is above maximum range, reading as extremely cold air. Usually an open circuit.
Frequently Asked Questions
- What does low IAT reading mean?
- Low voltage means the ECM thinks the air is very hot, so it trims fuel delivery. Usually a sensor fault.
- How to test IAT sensor?
- Measure resistance — should be ~2-3K ohms at 70°F. Much lower indicates a short.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07