P0112 Saturn Code - Intake Air Temperature Sensor Circuit Low Voltage
Quick Answer
The Intake Air Temperature (IAT) sensor contains a semiconductor device which changes the resistance based on the temperature (a thermistor). Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted. 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
- P0112 Saturn indicates Intake Air Temperature Sensor Circuit Low Voltage.
- Common causes
- Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted.
- 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 P0112 Saturn Description
When the intake air is cold, the sensor (thermistor) resistance is high. The PCMs signal voltage is only pulled down a small amount through the sensor to a ground; therefore, the PCM senses a high signal voltage (low temperature). When the intake air is warm, the sensor resistance is low. The signal voltage is pulled down a greater amount; therefore, the PCM senses a low signal voltage (high temperature).
When the PCM senses a signal voltage lower than the normal operating range of the sensor, this Diagnostic Trouble Code (DTC) sets.
What are the Possible Causes of the DTC P0112 Saturn?
- Dirty air filter
- Faulty Intake Air Temperature (IAT) Sensor
- Intake Air Temperature Sensor harness is open or shorted
- Intake Air Temperature Sensor circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P0112 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 P0112 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 P0112 Saturn Code
1. What are the common symptoms of OBDII code P0112 in a Saturn related to the intake air temperature sensor circuit low voltage?
- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.
2. What are the possible causes of OBDII code P0112 in a Saturn indicating a low voltage condition in the intake air temperature sensor circuit?
- Potential causes may include a faulty intake air temperature sensor, damaged wiring or connectors, a failed engine control module (ECM), or issues with the sensor ground.
3. How can I diagnose the intake air temperature sensor circuit low voltage issue in my Saturn triggering OBDII code P0112?
- You can use a multimeter to test the intake air temperature sensor for proper resistance values, check the sensor's wiring and connectors for damage, and inspect the ECM for any faults.
4. Can a dirty air filter or intake system cause OBDII code P0112 to appear in a Saturn?
- Yes, a dirty air filter or blocked intake system can disrupt the airflow and affect the intake air temperature sensor readings, potentially triggering code P0112.
5. Is it safe to continue driving my Saturn with OBDII code P0112 indicating a low voltage in the intake air temperature sensor circuit?
- It is not recommended to drive your vehicle for an extended period with this issue, as it can lead to further engine problems and potential damage if left unresolved.
6. How do I reset the OBDII code P0112 in my Saturn after repairing the intake air temperature sensor circuit low voltage problem?
- You can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the ECM's memory.
7. Can a DIY enthusiast repair the intake air temperature sensor circuit low voltage issue causing OBDII code P0112 in a Saturn?
- Depending on your skills and experience, you may be able to replace the intake air temperature sensor, check and repair wiring issues, and reset the code yourself.
8. Will a mechanic charge a lot to fix OBDII code P0112 related to the intake air temperature sensor circuit low voltage in my Saturn?
- The cost of repair can vary depending on the specific cause of the issue, but it is generally a relatively straightforward and affordable repair for a professional mechanic.
9. Can extreme weather conditions, such as very high or low temperatures, trigger OBDII code P0112 in a Saturn?
- Yes, extreme temperatures can affect the intake air temperature sensor readings and potentially lead to a low voltage condition, triggering code P0112.
10. How often should the intake air temperature sensor be inspected and replaced in a Saturn to prevent OBDII code P0112 from occurring?
- It is recommended to include the intake air temperature sensor in your regular vehicle maintenance schedule and replace it as needed based on the manufacturer's recommendations to prevent issues like code P0112.
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