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Engine-Codes – GMC – P112B GMC

P112B GMC Code - Intake Air Temperature Sensor 3 Performance

Quick Answer

The P112B GMC diagnostic trouble code refers to the Intake Air Temperature Sensor 3 Performance. Common causes include Faulty sensor: The most common cause of this code is a faulty intake air temperature sensor that needs to be replaced, Wiring issues: Damaged or corroded wiring leading to the sensor can also trigger this code, Poor electrical connection: A poor electrical connection between the sensor and the engine control module can lead to performance issues. 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
P112B GMC indicates Intake Air Temperature Sensor 3 Performance.
Common causes
Common causes include Faulty sensor: The most common cause of this code is a faulty intake air temperature sensor that needs to be replaced, Wiring issues: Damaged or corroded wiring leading to the sensor can also trigger this code, Poor electrical connection: A poor electrical connection between the sensor and the engine control module can lead to performance issues.
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 Sep 10, 2024
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Code P112B GMC Description

The P112B GMC diagnostic trouble code refers to the Intake Air Temperature Sensor 3 Performance. This code indicates that there is a performance issue with the intake air temperature sensor, which is responsible for measuring the temperature of the air entering the engine. The information provided by this sensor is crucial for the engine control unit to adjust the air-fuel mixture for optimal combustion. When the intake air temperature sensor is not functioning properly, it can lead to a variety of performance issues in the vehicle.

OBDII Code P112B GMC - Intake Air Temperature Sensor 3 Performance
P112B GMC Code - Intake Air Temperature Sensor 3 Performance

Common Causes of P112B GMC

  1. Faulty sensor: The most common cause of this code is a faulty intake air temperature sensor that needs to be replaced.
  2. Wiring issues: Damaged or corroded wiring leading to the sensor can also trigger this code.
  3. Poor electrical connection: A poor electrical connection between the sensor and the engine control module can lead to performance issues.
  4. Intake air leaks: Leaks in the intake system can affect the sensor's readings and trigger this code.
  5. Engine overheating: If the engine is running too hot, it can affect the accuracy of the intake air temperature sensor readings.

Symptoms of P112B GMC

  1. Decreased fuel efficiency: A faulty intake air temperature sensor can cause the engine control module to incorrectly adjust the air-fuel mixture, resulting in decreased fuel efficiency.
  2. Rough idling: The engine may idle roughly or inconsistently if the intake air temperature sensor is not functioning correctly.
  3. Hesitation: The vehicle may hesitate or have delayed throttle response when accelerating if the sensor is providing inaccurate readings.
  4. Engine stalling: In severe cases, a malfunctioning intake air temperature sensor can cause the engine to stall unexpectedly.

How to Fix P112B GMC

  1. Diagnose the issue: Use a diagnostic scanner to read the code and confirm that the intake air temperature sensor is the culprit.
  2. Locate the sensor: Locate the intake air temperature sensor, typically near the air filter housing or intake manifold.
  3. Replace the sensor: Remove the old sensor and install a new one, ensuring it is properly connected and secured.
  4. Clear the code: Use the diagnostic scanner to clear the trouble code from the engine control module's memory.
  5. Test drive: After the repair, test drive the vehicle to ensure that the performance issues have been resolved.

Cost to Fix P112B GMC

The cost of repairing the intake air temperature sensor can vary depending on the make and model of the vehicle, as well as the location and labor rates of the auto repair shop. On average, the cost of replacing an intake air temperature sensor ranges from $100 to $200 for the part. The total cost, including parts and labor, could range from $150 to $300. It's important to note that additional diagnostic time and labor costs may apply, so it's recommended to get a detailed estimate from a qualified mechanic before proceeding with the repair.

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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 P112B GMC Code

1. What are the common symptoms of OBDII code P112B GMC (Intake Air Temperature Sensor 3 Performance)?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and potential stalling.

2. What can cause the OBDII code P112B GMC to trigger?

- The code may trigger due to a faulty intake air temperature sensor, wiring issues, or a problem with the sensor circuit.

3. How can I diagnose the issue related to OBDII code P112B GMC?

- To diagnose the problem, you can use a scan tool to read the code, visually inspect the sensor and wiring for damage, and perform resistance tests on the sensor.

4. Is it safe to drive with the OBDII code P112B GMC active?

- It is not recommended to drive with the code active, as it can lead to poor engine performance and potential further damage if left unresolved.

5. Can I reset the OBDII code P112B GMC without fixing the underlying issue?

- While you can reset the code temporarily, it will likely reappear if the root cause of the problem is not addressed.

6. What are some repair tips for fixing OBDII code P112B GMC?

- Repair tips include replacing the intake air temperature sensor, repairing or replacing damaged wiring, and ensuring a proper connection to the sensor.

7. How much does it typically cost to fix OBDII code P112B GMC?

- The cost of fixing the issue can vary depending on the root cause, but it may involve replacing the sensor, which can range from $50 to $200 including parts and labor.

8. Can a DIY enthusiast fix OBDII code P112B GMC?

- DIY enthusiasts with some mechanical knowledge can potentially fix the issue by following repair guides and using the necessary tools for sensor replacement or wiring repairs.

9. Does the OBDII code P112B GMC affect emissions or vehicle safety?

- While the code itself may not directly impact emissions or safety, addressing the underlying issue promptly is important to maintain optimal engine performance and efficiency.

10. How often does the OBDII code P112B GMC occur in GMC vehicles?

- The occurrence of this specific code may vary, but it is not uncommon in GMC vehicles with intake air temperature sensor issues. Regular maintenance and inspections can help prevent such codes from appearing.

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