Error code

OBD2 P0112

OBD2P0112
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Intake Air Temperature Sensor 1 Circuit Low.

Severity

moderateCan drive, but may experience reduced fuel efficiency and potential drivability issues.

Summary

P0112 indicates that the Intake Air Temperature Sensor 1 is sending an abnormally low voltage signal to the Engine Control Module (ECM), suggesting a malfunction or wiring issue.

Symptoms

  • Check engine light (CEL) illuminated
  • Potential hesitation when cold, pinging when hot

Common Causes

  • Defective Intake Air Temperature Sensor
  • Contaminated sensor due to poor air filter installation or excessive PCV blow-by
  • Improper installation of the IAT sensor
  • Rodent damage to wiring harness

Diagnosis

  1. Check resistance across terminals of the IAT sensor with a DVOM.
  2. Verify voltage at the connector when disconnected from the ECU.
  3. Inspect wiring for corrosion or damage between the ECU and IAT sensor.
  4. Use a scan tool to read live data if available.

Fixes

  • Replace the Intake Air Temperature Sensor

FAQ

What does P0112 mean?

P0112 indicates that the IAT sensor is sending an abnormally low voltage signal to the ECM.

How do I diagnose P0112?

Use a DVOM or scan tool to check resistance and voltage at the IAT sensor connector, inspect wiring for damage, and verify proper installation of the sensor.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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