P0112 — Intake Air Temperature Sensor Circuit Low

P0112 means the intake air temperature sensor is reporting an implausibly low voltage — the ECM reads it as extremely hot air. Usually a shorted circuit or a failed sensor.

Cost range: $40–$250. Severity: low. Safe to drive? Yes. Expect slightly worse fuel economy and possible hard cold starts.

Most common causes of P0112

1. Short to ground in the IAT wiring — Chafed harness near the intake is common. ($80–$200)
2. Failed IAT sensor — Often integrated into the MAF assembly on modern cars. ($40–$200)
3. Corroded connector — Clean and re-seat before buying parts. ($0–$40)

Symptoms drivers report with P0112

• Check engine light
• Slightly rough cold start
• Minor fuel economy drop