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Home/DTC Codes/Pontiac/Sunfire/1995-2005 2.2L I4/P1112
P1112

IAT Sensor Circuit Intermittent Low Voltage

1995-2005 Pontiac Sunfire 2.2L I4

Low SeverityPowertrain

Description

The PCM detected intermittent low voltage on the Intake Air Temperature sensor circuit, indicating a sporadic short to ground.

Symptoms

  • Check Engine Light (intermittent)
  • Incorrect fueling calculations
  • Intermittent performance issues

Common Causes

  • Shorted IAT sensor wiring
  • Faulty IAT sensor
  • Water intrusion in connector
  • Chafed wiring

Diagnostic Steps

  1. Wiggle test IAT connector
  2. Inspect wiring for shorts to ground
  3. Test IAT sensor resistance
  4. Check for water in connector

Repair Notes

Repair shorted wiring or replace IAT sensor.

Related Codes

P0110Intake Air Temperature (IAT) Sensor 1 CircuitP0112IAT Sensor 1 Circuit Low InputP1111IAT Sensor Circuit Intermittent High VoltageP1111IAT Sensor Circuit Intermittent High VoltageP1111IAT Sensor Circuit Intermittent High VoltageP1111IAT Sensor Circuit Intermittent High VoltageP1111IAT Sensor Circuit Intermittent High VoltageP1111IAT Sensor Circuit Intermittent High VoltageP1111IAT Sensor Circuit Intermittent High VoltageP1111IAT Sensor Circuit Intermittent High VoltageP1111Intake Air Temperature Sensor Circuit Low/IntermittentP1111Intake Air Temperature Sensor Circuit Low/IntermittentP1111Intake Air Temperature Sensor Circuit Low/Intermittent

Other Powertrain Codes

P1112 on Other Vehicles

Pontiac Aztek

2001-2005 3.4L V6

Pontiac Bonneville

1990-1999 3.8L V6

Pontiac Bonneville

2000-2005 3.8L V6

Pontiac Bonneville GXP

2000-2005 4.6L V8

Pontiac Bonneville GXP

2000-2005 4.6L V8 Northstar

Pontiac Bonneville SSEi

1992-1999 3.8L Supercharged V6

Pontiac Bonneville SSEi

1992-1999 3.8L V6 Supercharged

Pontiac Firebird

1993-1997 3.4L V6

Common Questions

What does code P1112 mean on a 1995-2005 Pontiac Sunfire?

P1112 stands for "IAT Sensor Circuit Intermittent Low Voltage". The PCM detected intermittent low voltage on the Intake Air Temperature sensor circuit, indicating a sporadic short to ground.

What are the symptoms of P1112 on a Pontiac Sunfire?

Common symptoms of P1112 include: Check Engine Light (intermittent), Incorrect fueling calculations, Intermittent performance issues.

What causes P1112 on a 1995-2005 Pontiac Sunfire?

Common causes of P1112 include: Shorted IAT sensor wiring, Faulty IAT sensor, Water intrusion in connector, Chafed wiring.

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