P0099 2014 GMC Sierra Code - Intake Air Temperature Sensor 2 Circuit Intermittent
Quick Answer
The P0099 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to the Intake Air Temperature Sensor 2 Circuit Intermittent. Common causes include Faulty Intake Air Temperature Sensor: The sensor itself may be malfunctioning, sending intermittent or incorrect signals to the ECM, Wiring Issues: Damaged or corroded wiring connections to the intake air temperature sensor can cause intermittent signal disruptions, Poor Electrical Ground: A weak or poor electrical ground connection can lead to intermittent sensor 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
- P0099 2014 GMC Sierra indicates Intake Air Temperature Sensor 2 Circuit Intermittent.
- Common causes
- Common causes include Faulty Intake Air Temperature Sensor: The sensor itself may be malfunctioning, sending intermittent or incorrect signals to the ECM, Wiring Issues: Damaged or corroded wiring connections to the intake air temperature sensor can cause intermittent signal disruptions, Poor Electrical Ground: A weak or poor electrical ground connection can lead to intermittent sensor 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0099 2014 GMC Sierra Description
The P0099 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to the Intake Air Temperature Sensor 2 Circuit Intermittent. This code indicates that there is a problem with the intake air temperature sensor circuit, specifically sensor 2. The intake air temperature sensor is responsible for measuring the temperature of the air entering the engine. This information is crucial for the engine control module (ECM) to adjust the air-fuel mixture and ignition timing to optimize engine performance and efficiency.
Common Causes of P0099 2014 GMC Sierra
- Faulty Intake Air Temperature Sensor: The sensor itself may be malfunctioning, sending intermittent or incorrect signals to the ECM.
- Wiring Issues: Damaged or corroded wiring connections to the intake air temperature sensor can cause intermittent signal disruptions.
- Poor Electrical Ground: A weak or poor electrical ground connection can lead to intermittent sensor issues.
- ECM Malfunction: A malfunctioning engine control module may not be able to properly interpret the signals from the intake air temperature sensor.
Symptoms of P0099 2014 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Engine Misfires: Intermittent issues with the intake air temperature sensor can lead to engine misfires, rough idling, or hesitation during acceleration.
- Reduced Fuel Efficiency: Incorrect air temperature readings can cause the ECM to deliver an incorrect air-fuel mixture, resulting in decreased fuel efficiency.
- Engine Stalling: In severe cases, the engine may stall or have difficulty starting due to the inaccurate sensor readings.
How to Fix P0099 2014 GMC Sierra
- Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a visual inspection of the intake air temperature sensor and its wiring.
- Test the Sensor: Check the sensor's resistance and voltage output to determine if it is functioning correctly.
- Check Wiring: Inspect the wiring harness for any damage, corrosion, or loose connections. Repair or replace as necessary.
- Verify Ground Connection: Ensure that the intake air temperature sensor has a solid ground connection to the vehicle's chassis.
- Clear DTC: After completing the repairs, clear the DTC with a scan tool and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0099 2014 GMC Sierra
The typical repair costs for addressing a P0099 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty intake air temperature sensor can range from $50 to $150, while addressing wiring or ground connection issues may require additional labor costs. Overall, the total repair cost, including parts and labor, could range from $100 to $300. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate.
Tech Notes for P0099 2014 GMC Sierra
User Submitted Video
Need more information about the P0099 2014 GMC Sierra code?
Need more information on how to fix the P0099 2014 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0099 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0099 2014 GMC Sierra Code
What does the OBDII code P0099 mean on a 2014 GMC Sierra?
1. P0099 indicates an intermittent issue with the Intake Air Temperature (IAT) Sensor 2 circuit, meaning the sensor is not consistently providing accurate readings to the engine control module (ECM). 2.
What are the symptoms of code P0099 on a 2014 GMC Sierra?
Common symptoms include poor engine performance, reduced fuel efficiency, difficulty starting the engine, and a check engine light illuminated on the dashboard. 3.
What causes the P0099 code to appear on a 2014 GMC Sierra?
Potential causes include a faulty IAT Sensor 2, damaged or corroded wiring or connectors, a short or open circuit in the sensor circuit, or, less commonly, a malfunction in the ECM itself. 4.
Can I drive my 2014 GMC Sierra with the P0099 code?
While the vehicle may still be drivable, prolonged operation with this code can lead to poor engine performance and potential damage. It’s best to address the issue promptly. 5.
How do I fix the P0099 code on a 2014 GMC Sierra?
Start by inspecting the IAT Sensor 2 and its wiring for damage or corrosion. Clean or replace any damaged connectors, repair broken wires, and replace the sensor if necessary. If the issue persists, further diagnose the ECM. 6.
Where is the IAT Sensor 2 located on a 2014 GMC Sierra?
IAT Sensor 2 is typically located near the intake manifold or air intake system. Refer to the vehicle’s service manual for the exact location. 7.
How much does it cost to fix the P0099 code on a 2014 GMC Sierra?
Repair costs vary depending on the issue. Replacing the IAT sensor typically costs $50-$150 for parts and labor. Wiring repairs may add to the cost. 8.
What tools are needed to diagnose and fix the P0099 code?
You’ll need an OBDII scanner, a multimeter for testing electrical circuits, and basic hand tools to remove and replace components. 9.
Could a dirty air filter cause the P0099 code on a 2014 GMC Sierra?
A dirty air filter is unlikely to directly cause the P0099 code but can contribute to airflow issues that may affect sensor performance. Check and replace the air filter if needed. 10.
How can I prevent the P0099 code from recurring on my 2014 GMC Sierra?
Regular maintenance, including inspecting and cleaning electrical connections, replacing the air filter, and ensuring the intake system is free of debris, can help prevent this code from reoccurring.
Discuss the causes and fixes for P0099 2014 GMC Sierra OBDII Code
Code P0099 2014 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.