P1112 Pontiac Code - Intake Air Temperature Sensor Circuit Intermittent Low Voltage
Quick Answer
The Intake Air Temperature (IAT) sensor contains a semiconductor device which changes resistance based on temperature (a thermistor). Common causes include Faulty Intake Air Temperature Sensor, Intake Air Temperature Sensor harness is open or shorted, Intake Air Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1112 Pontiac indicates Intake Air Temperature Sensor Circuit Intermittent Low Voltage.
- Common causes
- Common causes include Faulty Intake Air Temperature Sensor, Intake Air Temperature Sensor harness is open or shorted, Intake Air Temperature Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1112 Pontiac Description
When the intake air is cold, the sensor (thermistor) resistance is high, and the PCMs signal voltage is only pulled down a small amount through the sensor to ground. The PCM senses a high signal voltage (low temperature). When the intake air is warm, the sensor resistance is low, and the signal voltage is pulled down a greater amount. This causes the PCM to sense a low signal voltage (high temperature).
What are the Possible Causes of the DTC P1112 Pontiac?
- Faulty Intake Air Temperature Sensor
- Intake Air Temperature Sensor harness is open or shorted
- Intake Air Temperature Sensor circuit poor electrical connection
How to Fix the DTC P1112 Pontiac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1112 Pontiac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1112 Pontiac Code
What does the OBDII code P1112 mean for a Pontiac?
P1112 indicates an intermittent low voltage in the intake air temperature (IAT) sensor circuit, which can affect engine performance and fuel efficiency.
What are the symptoms of code P1112 in a Pontiac?
Common symptoms include poor fuel economy, rough idling, reduced engine power, and the check engine light illuminating.
What causes code P1112 to appear in a Pontiac?
Likely causes include a faulty IAT sensor, damaged wiring or connectors, corrosion, or issues with the engine control module (ECM).
How do I diagnose code P1112 in a Pontiac?
Start by inspecting the IAT sensor and its wiring for visible damage or corrosion. Use a multimeter to check voltage and continuity in the circuit.
Can a bad intake air temperature sensor cause code P1112?
Yes, a faulty or failing IAT sensor is one of the most common causes of this code.
Can I drive my Pontiac with code P1112?
While the vehicle may still run, driving with this code can lead to reduced performance and fuel efficiency. Prompt repairs are recommended.
How do I fix code P1112 on a Pontiac?
Repairs may include replacing the IAT sensor, repairing or replacing damaged wiring, cleaning connectors, or updating the ECM software.
How much does it cost to repair code P1112 in a Pontiac?
Costs can vary, but replacing the IAT sensor typically costs $50-$150, while wiring repairs may cost more depending on complexity.
Can a dirty air filter trigger code P1112 on a Pontiac?
No, a dirty air filter is unlikely to cause this code. It’s specific to the IAT sensor circuit and its components.
Do I need special tools to fix code P1112 in a Pontiac?
A multimeter is often required to test electrical connections, and basic tools like screwdrivers may be needed for sensor replacement.
Discuss the causes and fixes for P1112 Pontiac OBDII Code
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