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P0112 Cadillac Code - Intake Air Temperature Sensor Circuit Low Voltage

Quick Answer

The P0112 code for Cadillac vehicles indicates a problem with the Intake Air Temperature (IAT) sensor circuit, specifically showing low voltage. Common causes include Faulty IAT Sensor: The sensor itself may be malfunctioning, providing incorrect voltage readings to the ECU, Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECU can disrupt the voltage signal, Poor Electrical Connection: Loose or poor electrical connections at the sensor or ECU can cause voltage fluctuations. 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 Cadillac indicates Intake Air Temperature Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty IAT Sensor: The sensor itself may be malfunctioning, providing incorrect voltage readings to the ECU, Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECU can disrupt the voltage signal, Poor Electrical Connection: Loose or poor electrical connections at the sensor or ECU can cause voltage fluctuations.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P0112 Cadillac Description

The P0112 code for Cadillac vehicles indicates a problem with the Intake Air Temperature (IAT) sensor circuit, specifically showing low voltage. The IAT sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for the engine control unit (ECU) to adjust the air-fuel mixture for optimal combustion. When the voltage from the IAT sensor is too low, it can lead to incorrect air-fuel ratios, affecting the engine's performance and fuel efficiency.

OBDII Code P0112 Cadillac - Intake Air Temperature Sensor Circuit Low Voltage
P0112 Cadillac Code - Intake Air Temperature Sensor Circuit Low Voltage

Common Causes of P0112 Cadillac

  1. Faulty IAT Sensor: The sensor itself may be malfunctioning, providing incorrect voltage readings to the ECU.
  2. Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECU can disrupt the voltage signal.
  3. Poor Electrical Connection: Loose or poor electrical connections at the sensor or ECU can cause voltage fluctuations.
  4. Intake Air Leak: Any leaks in the intake system can affect the air temperature readings, triggering the code.
  5. ECU Malfunction: In rare cases, a malfunctioning ECU could also be the cause of the low voltage reading.

Symptoms of P0112 Cadillac

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine Light on the dashboard.
  2. Rough Idle: The engine may exhibit a rough idle or hesitation during acceleration due to incorrect air-fuel mixture.
  3. Poor Fuel Economy: A decrease in fuel efficiency can be noticed as the engine struggles to operate efficiently.
  4. Engine Stalling: In severe cases, the engine may stall while driving, especially during sudden acceleration or deceleration.

How to Fix P0112 Cadillac

  1. Diagnose the Issue: Use a diagnostic scanner to read the code and confirm the low voltage reading from the IAT sensor.
  2. Inspect Wiring and Connections: Check the wiring harness and connectors for any damage or corrosion, repairing or replacing as needed.
  3. Test the IAT Sensor: Test the sensor itself using a multimeter to ensure it is providing the correct voltage readings.
  4. Check for Intake Leaks: Inspect the intake system for any leaks that could be affecting the sensor's readings.
  5. Clear the Code: After making necessary repairs, clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0112 Cadillac

The cost of repairing a P0112 code can vary depending on the specific cause of the issue. Typically, the cost of a new IAT sensor ranges from $20 to $100, while the labor cost for diagnosis and repair can be between $100 and $300. Overall, the total repair cost for this issue may range from $120 to $400, but it's advisable to check with local auto repair shops for accurate pricing based on your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0112 Cadillac Code

1. What does the OBDII code P0112 mean on a Cadillac?

P0112 indicates that the Intake Air Temperature (IAT) sensor circuit is reporting a low voltage signal to the Engine Control Module (ECM), suggesting the sensor is detecting an unusually low air temperature.

2. What are common symptoms of the P0112 code on a Cadillac?

Symptoms may include poor fuel economy, rough idling, reduced engine performance, difficulty starting the vehicle, and the Check Engine Light being illuminated.

3. What causes the P0112 code on a Cadillac?

Common causes include a faulty IAT sensor, damaged or corroded wiring, a short circuit, a loose connection, or issues with the ECM.

4. Can I drive my Cadillac with the P0112 code active?

While you may still be able to drive, operating the vehicle with this code can result in poor performance and could potentially lead to further engine issues if not addressed promptly.

5. How do I diagnose the P0112 code on a Cadillac?

Diagnosis typically involves using an OBDII scanner to confirm the code, visually inspecting the IAT sensor and wiring, testing the sensor's resistance with a multimeter, and checking for proper voltage at the sensor connector.

6. How do I fix the P0112 code on my Cadillac?

Possible fixes include replacing the IAT sensor, repairing damaged wiring or connectors, cleaning corroded connections, or, in rare cases, replacing the ECM.

7. Where is the IAT sensor located on a Cadillac?

The IAT sensor is usually located near the air intake system, often inside or attached to the air filter housing or intake manifold.

8. Can a dirty air filter cause the P0112 code on a Cadillac?

A dirty air filter itself is unlikely to trigger the code, but it can contribute to reduced airflow and potentially affect the accuracy of the IAT sensor readings.

9. How much does it cost to fix the P0112 code on a Cadillac?

Repairs can range from $50 to $200, depending on whether the issue is a simple wiring repair or requires replacing the IAT sensor.

10. Will clearing the P0112 code fix the problem on my Cadillac?

Clearing the code will turn off the Check Engine Light temporarily, but if the underlying issue isn’t fixed, the code will return.

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