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Engine-Codes – GMC – P0099 GMC

P0099 GMC Code - Intake Air Temperature Sensor 2 Circuit Intermittent

Quick Answer

The P0099 diagnostic trouble code for GMC vehicles refers to the Intake Air Temperature Sensor 2 Circuit Intermittent. Common causes include Faulty intake air temperature sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor terminals. 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
P0099 GMC indicates Intake Air Temperature Sensor 2 Circuit Intermittent.
Common causes
Common causes include Faulty intake air temperature sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor terminals.
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 12, 2024
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Code P0099 GMC Description

The P0099 diagnostic trouble code for GMC vehicles refers to the Intake Air Temperature Sensor 2 Circuit Intermittent. This code indicates that there is a problem with the circuit that is responsible for monitoring the intake air temperature in the engine. The intake air temperature sensor plays a crucial role in ensuring the engine operates at optimal efficiency by providing data to the engine control module (ECM) to adjust the air-fuel mixture.

OBDII Code P0099 GMC - Intake Air Temperature Sensor 2 Circuit Intermittent
P0099 GMC Code - Intake Air Temperature Sensor 2 Circuit Intermittent

Common Causes of P0099 GMC

  1. Faulty intake air temperature sensor
  2. Wiring or connector issues in the sensor circuit
  3. Corrosion or damage to sensor terminals
  4. ECM software or hardware issues
  5. Intake air leaks near the sensor

Symptoms of P0099 GMC

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Hesitation or lack of power during acceleration
  4. Check Engine Light illuminated
  5. Increased emissions

How to Fix P0099 GMC

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code and verify the sensor's operation.
  2. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
  3. Test the intake air temperature sensor using a multimeter to ensure it is functioning correctly.
  4. If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  5. Clear the trouble code from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0099 GMC

The cost of repairing a P0099 code for the Intake Air Temperature Sensor 2 Circuit Intermittent can vary depending on the specific vehicle make and model, as well as the labor rates in your area. On average, the parts for this repair can range from $50 to $150, with labor costs adding an additional $80 to $150 per hour. Overall, you can expect to pay anywhere from $150 to $400 for this repair, but it's advisable to obtain quotes from local auto repair shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops often offer more competitive pricing.

What does this mean?

Tech Notes for P0099 GMC

The Intake Air Temperature (IAT) sensor 1, IAT sensor 2, Humidity sensor, MAF sensor, and BARO pressure sensor are integrated within the Mass Air Flow / Multifunction Intake Air Sensor.











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Information for Specific GMC Models

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 P0099 GMC Code

1. What are the common symptoms of OBDII code P0099 (GMC) related to the Intake Air Temperature Sensor 2 Circuit Intermittent?

- Common symptoms include poor engine performance, rough idling, stalling, decreased fuel efficiency, and potential issues with the vehicle's emissions.

2. What are the possible causes of OBDII code P0099 (GMC) related to the Intake Air Temperature Sensor 2 Circuit Intermittent?

- Possible causes include a faulty intake air temperature sensor, wiring or connector issues, sensor circuit malfunctions, or issues with the engine control module.

3. How can I diagnose the Intake Air Temperature Sensor 2 Circuit Intermittent issue causing OBDII code P0099 (GMC)?

- To diagnose the problem, you can use a scan tool to check for the specific error code, visually inspect the sensor and its wiring for damage, and perform electrical tests to determine if the sensor is functioning correctly.

4. Can I drive my vehicle with OBDII code P0099 (GMC) triggered by the Intake Air Temperature Sensor 2 Circuit Intermittent issue?

- It is not recommended to drive your vehicle with this issue as it can lead to further engine problems and decreased performance.

5. How do I repair the Intake Air Temperature Sensor 2 Circuit Intermittent problem causing OBDII code P0099 (GMC)?

- The repair process may involve replacing the faulty intake air temperature sensor, repairing or replacing damaged wiring or connectors, or resetting the engine control module.

6. Are there any DIY tips for addressing OBDII code P0099 (GMC) related to the Intake Air Temperature Sensor 2 Circuit Intermittent?

- DIY tips include checking and cleaning the sensor connections, inspecting the wiring for any visible damage, and ensuring the sensor is securely mounted in place.

7. Can a malfunctioning Intake Air Temperature Sensor 2 Circuit cause other issues in the vehicle?

- Yes, a malfunctioning sensor can lead to poor engine performance, potential damage to engine components, and may trigger other error codes related to the engine's operation.

8. How important is the Intake Air Temperature Sensor for the overall functioning of the vehicle?

- The Intake Air Temperature Sensor plays a crucial role in providing the engine control module with accurate data for fuel delivery and engine performance, making it an essential component for efficient vehicle operation.

9. Is it recommended to clear the OBDII code P0099 (GMC) after repairing the Intake Air Temperature Sensor 2 Circuit Intermittent issue?

- Yes, it is recommended to clear the error code after the repair to reset the engine control module and ensure that the issue has been successfully addressed.

10. How can I prevent future occurrences of OBDII code P0099 (GMC) related to the Intake Air Temperature Sensor 2 Circuit Intermittent?

- Regular maintenance checks, timely replacement of sensors, and addressing any issues with the intake air temperature sensor promptly can help prevent future instances of this error code.

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