P1112 Saturn 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 Saturn 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 Saturn 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 Saturn?
- 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 Saturn?
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 Saturn 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 Saturn Code
What does the OBDII code P1112 mean for a Saturn vehicle?
P1112 indicates an intermittent low voltage issue in the Intake Air Temperature (IAT) sensor circuit, which can affect engine performance and fuel efficiency.
What are the common symptoms of code P1112 in a Saturn?
Symptoms may include poor fuel economy, rough idling, hesitation during acceleration, and possibly an illuminated check engine light.
What causes the P1112 code to appear in a Saturn?
Common causes include a faulty IAT sensor, damaged or corroded wiring, a bad electrical connection, or issues with the engine control module (ECM).
Can I drive my Saturn with the P1112 code active?
While the vehicle may still be drivable, it’s not recommended to ignore the issue as it can lead to decreased performance and increased fuel consumption over time.
How do I check the IAT sensor for problems?
Inspect the sensor and its wiring for visible damage or corrosion. You can also test the sensor’s resistance with a multimeter to ensure it’s within the manufacturer’s specifications.
How do I fix the P1112 code on my Saturn?
Repairs may include replacing the IAT sensor, fixing or replacing damaged wiring, cleaning corroded connectors, or addressing ECM-related issues.
Can a dirty air filter cause the P1112 code on a Saturn?
While unlikely, a severely clogged air filter could indirectly affect the IAT sensor by restricting airflow, leading to inaccurate readings.
Does the P1112 code require professional diagnosis?
If basic checks of the sensor and wiring don’t resolve the issue, professional diagnosis may be necessary to pinpoint the exact cause, especially if the ECM is involved.
How much does it cost to repair the P1112 code on a Saturn?
Repair costs can vary, but replacing the IAT sensor typically costs between $50 and $150, including parts and labor, depending on your location and vehicle model.
Can a bad IAT sensor affect emissions?
Yes, a malfunctioning IAT sensor can cause incorrect air-fuel mixture readings, potentially leading to increased emissions and failing an emissions test.
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