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
OEM Procedures for P0112
Intake Air Temperature Sensor 1 Circuit Low Input Found 2 OEM service manual procedures.
Intake Air Temperature Sensor - Intake Air Temperature Sensor Replacement
Intake Air Temperature Sensor - Intake Air Temperature Sensor Replacement
Intake Air Temperature Sensor - Intake Air Temperature Sensor Replacement
Intake Air Temperature Sensor - Intake Air Temperature Sensor Replacement
Intake Air Temperature Sensor - Intake Air Temperature Sensor Replacement
Intake Air Temperature Sensor - Intake Air Temperature Sensor Replacement
Intake Air Temperature Sensor - Intake Air Temperature Sensor Replacement
Intake Air Temperature Sensor - Intake Air Temperature Sensor Replacement
OEM Diagnostic Flowchart
Scroll to load technician if/then branches.
Read live data and freeze frame for P0112 to pinpoint the cause before buying parts.
TopScan
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ArtiLink600
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DIYers working on ABS/airbag systems
View on TOPDONGot a repair estimate for P0112? Check if the quote is fair before ordering parts.
Parts & Tools for This Job
Common parts shoppers buy for P0112 Intake Air Temperature Sensor Circuit Low.
Thermostat
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Engine Coolant
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Radiator
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Water Pump
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Coolant Temp Sensor
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Turn This Into a Confident Next Step
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OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0112.
OEM Manual Evidence
Browse →PGM-FI DTCS — 2013 Acura MDX 3.7L Eng VIN 2 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >> Acura >> 2013...
PGM-FI DTCS — 2013 Acura MDX 3.7L Eng VIN YD2 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >> Acura >> 20...
Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Related Symptoms
Browse →Exact Vehicle Hubs
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Open the exact vehicle hub grounded by OEM manual evidence related to P0112.
Open the exact vehicle hub grounded by OEM manual evidence 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
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29